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Switched (e.g., switching regulators)

Subclass of:

323 - Electricity: power supply or regulation systems

323234000 - OUTPUT LEVEL RESPONSIVE

323265000 - Using a three or more terminal semiconductive device as the final control device

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
323283000 Digitally controlled 266
323284000 With threshold detection 219
323285000 With plural condition sensing 110
323288000 With ramp generator or controlled capacitor charging 98
323290000 With inductor in control circuit 22
323289000 With base drive control dissipation 1
20110001462ELECTRONIC DEVICE AND METHOD FOR DC-DC CONVERSION - An electronic device is provided for switched DC-DC conversion of an input voltage level into an output voltage level comprising a driving stage for controlling a control gate of a high side power switch so as to vary the voltage level on a switching node and an auxiliary switch, wherein the auxiliary switch is coupled between the control gate of the power switch and the switching node so as to feed a charge released from the control gate in a switching operation to the switching node.01-06-2011
Entries
DocumentTitleDate
20080278129SWITCHING REGULATOR CAPABLE OF PREVENTING REVERSE CURRENT - A switching regulator includes a first switch, an inductor, a second switch, a control circuit to control a switching operation by switching the first switch and switching the second switch complementally to the first switch, a reverse current protection circuit to shut off a current through the second switch to prevent a reverse current from an output terminal toward the second switch, and a soft-start circuit to cause the control circuit to perform a soft-start operation in which the output voltage is being increased gradually during a time period from a start-up to a predetermined elapsed time. The soft-start circuit causes the reverse current protection circuit to stop a shutoff operation of the current through the second switch when a generation or an indication of the reverse current is detected during the soft-start operation instructed by the control circuit.11-13-2008
20110175585CURRENT BALANCE CIRCUIT - A current balance circuit includes a first and a second current sensors, an averager, a first and a second control modules, and a first and a second rheostat elements. The first and second current sensors receive a first current and a second current from a power source respectively and convert the first and second currents into a first and a second voltages. The averager receives the first and second voltages and calculates to obtain an average voltage. The first and second control modules receive the first voltage, the second voltage, and the average voltage, to obtain a first and a second control signals, to control current conduction ability of the first and second rheostat elements, to make the first and second currents keep a dynamic balance.07-21-2011
20130027011POWER SUPPLYING CIRCUIT AND POWER SUPPLYING METHOD - A power supplying circuit for generating an output voltage, which comprises: a noise detecting circuit, for receiving a first reference voltage and for generating a second reference voltage according to the output voltage and the first reference voltage, wherein a noise component of the second reference voltage is the same as which of the output voltage; a control voltage generating unit, for receiving a feedback voltage and the second reference voltage, and for generating a control voltage according to the feedback voltage and the second reference voltage; a voltage providing device, for generating the output voltage according to the control voltage and an input voltage; and a feedback module, for generating the feedback voltage according to the output voltage.01-31-2013
20100156368Power converters with switched capacitor buck/boost - A power converter having a switched capacitor buck/boost operation has first and second switches coupled to a first switching node, third and fourth switches coupled to a second switching node, a capacitor coupled between the first and second switching nodes, and an inductor coupled to the first switching node. A switch controller controls the switches to operate in voltage step-down mode and voltage step-up mode depending on a difference between converter output voltage VOUT and converter input voltage VIN. In a buck-optimized topology operating in a step-down mode, an output current flowing through the first switching node flows through only one switch at a given time. In a boost-optimized topology operating in a step-up mode, an output current flowing through the first switching node flows through only one switch at a given time. As a result, a more compact and efficient power converter may be realized at lower cost.06-24-2010
20100156366STEP-DOWN SWITCHING REGULATOR, CONTROL CIRCUIT THEREOF, AND ELECTRONIC DEVICE USING THE SAME - An output monitoring comparator outputs an ON signal when an output voltage becomes lower than a reference voltage. A pulse modulator generates a pulse signal at a predetermined level, an ON time-period from when the ON signal is outputted. A driver circuit alternately turns ON, after a dead time, a switching transistor and a synchronous rectification transistor, based on the pulse signal. A light load mode detector compares a switching voltage at a connection point of the switching transistor and the synchronous rectification transistor, and ground potential, and at timing at which the ON signal is outputted from the output monitoring comparator, when the switching voltage is higher than the ground potential, nullifies the ON signal.06-24-2010
20100156369HIGH CURRENT VOLTAGE REGULATOR - A linear voltage regulator which includes on its input side an array of switched super capacitors for increasing the overall efficiency between the power source and the load. This apparatus is capable of delivering currents typically from milliamperes to greater than several amperes at very low switching frequencies, hence effectively reducing noise. In addition by using capacitors rather than resistors or transistor devices to drop voltage on the input side, efficiency is enhanced. The array of capacitors is switched by simple analog circuitry or a switching logic with or without a processor subsystem and the capacitors themselves are of the super capacitor type, thus providing very high capacitance, and are effectively series connected during certain phases of operation with the input terminal of the conventional linear voltage regulator portion of the apparatus. Energy stored in the super capacitors during the various phases of operation is reused to improve efficiency.06-24-2010
20100156367CONSTANT VOLTAGE CIRCUIT AND METHOD OF CONTROLLING OUPUT VOLTAGE OF CONSTANT VOLTAGE CIRCUIT - A constant voltage circuit for converting an input voltage input from an input terminal, converting the input voltage to a predetermined constant voltage, and outputting the converted voltage from an output terminal is disclosed that includes an output transistor for outputting a current corresponding to a control signal from the input terminal to the output terminal, a control circuit part for controlling operation of the output transistor so that a proportional voltage proportional to the voltage output from the output terminal is equal to a reference voltage, and a pseudo-load current control circuit part for supplying a pseudo-load current from the output terminal when detecting that the output transistor is switched off according to a voltage difference between the input voltage and a voltage of a gate of the output transistor.06-24-2010
20090195233MANAGEMENT OF REGULATOR-INDUCED SWITCHING NOISE FOR SAMPLED SYSTEMS - A system includes a sampler to sample an input voltage and a switching regulator. The switching regulator is adapted to regulate a switching operation of the regulator in response to the sampling by the sampler.08-06-2009
20090195232RADIO-FREQUENCY SWITCH CIRCUIT - A switch circuit is provided that includes at least one main switching device and at least one shunt switching device. Each main switching device is connected in series with a conductor that carries an RF signal between an input circuit and an output circuit. Each shunt switching device is connected between a controlling terminal of the main switching device and a high frequency ground. The switch circuit can provide substantially improved OFF state isolation over other approaches.08-06-2009
20090195231Power Supply Circuit and Dynamic Switch Voltage Control - According to one configuration, a monitor circuit monitors a delivery of power supplied by one or more switch devices to a dynamic load. Based on an amount of power delivered to the load as measured by the monitor circuit, a control circuit produces a voltage control signal. A gate bias voltage generator circuit utilizes the voltage control signal to generate a switch activation voltage or bias voltage. A switch drive circuit uses the switch activation voltage as generated by the bias voltage generator to activate each of the one or more switch devices during a portion of a switching cycle when a respective switch device is in an ON state, and the respective switch device conducts current from a voltage source through the switch device to the load. The control circuit adjusts the voltage control signal to modify a level of the switch activation voltage depending on the dynamic load.08-06-2009
20090195230Circuits and Methods for Controlling a Switching Regulator based on a Derived Input Current - In one embodiment the present invention includes a method of controlling a switching regulator based on a derived input current. In one embodiment, an output current of said switching regulator is detected and used to generate a first voltage or current signal corresponding to the output current. Additionally, a switching signal of said switching regulator is detected and used to generate a second voltage or current signal corresponding to the switching signal. The resulting signals may be combined to produce a voltage or current signal corresponding to an input current of said switching regulator. The switching signal may be modified based on the derived voltage or current signal and used to control the system.08-06-2009
20120169313SWITCH CONTROL CIRCUIT, CONVERTER USING THE SAME, AND SWITCH CONTROL METHOD - The present invention relates to a switch control circuit, a switch control method, and a converter using the same. An input voltage of a converter is provided to an inductor, and an output voltage is generated by an inductor current caused by the input voltage. A switch control circuit for controlling a switching operation of a power switch connected to the inductor to control the inductor current senses a drain current flowing to the power switch while the power switch is turned on, and controls a slope of a sawtooth wave signal for determining a turn-off time of the power switch according to the sensed drain current.07-05-2012
20100013451SEMICONDUCTOR DEVICE - A semiconductor device includes: a high-side switching element having a first switching element connected between an input voltage line and an inductive load; and a low-side switching element having a second switching element and a third switching element that are connected in parallel between the inductive load and a reference voltage line. A surge current is discharged through the third switching element to the reference voltage line when a surge is applied to a terminal connected to the inductive load in the low-side switching element.01-21-2010
20100156370Switching regulator and method for eliminating beat oscillation - The present invention discloses a switching regulator eliminating beat oscillation, comprising: a first transistor, a second transistor, and an inductor connected to a common node, wherein the first and second transistors operate to convert an input voltage to an output voltage; a comparator comparing a voltage signal with a saw tooth wave to generate a control signal controlling at least one of the first and second transistors; a feedback loop obtaining a feedback signal from the output voltage and generating the voltage signal according to the feedback signal; and an inductorless filter circuit located in the feedback loop for filtering a predetermined frequency band.06-24-2010
20100164454POWER CONVERTER - The present invention relates to power converters of the type known generally as switch mode power converters (SMPCs). In particular, the present invention addresses the problem of reducing thermal stress across the phases of a multi phase converter. Specifically, a method of controlling a multi-phase switch mode power arrangement is provided. The multi-phase arrangement comprises a plurality of phases configured to deliver DC power to a common load. The method comprises the steps of: determining the thermal stress of each phase along with at least one other stress for each phase and controlling the share of DC power provided by the individual phases in an effort to equalise the thermal and other stress across the individual phases.07-01-2010
20100164446BIDIRECTIONAL DC-DC CONVERTER - The object of the present invention is to provide a bi-directional DC-DC converter having a simplified circuit configuration. Each output of high voltage detection circuit (07-01-2010
20100164450APPARATUS, SYSTEM, AND METHOD FOR PROVIDING HIGH EFFICIENCY IN A POWER SUPPLY OVER A RANGE OF LOAD CONDITIONS - An apparatus, system, and method are disclosed for providing high efficiency in a power supply over a range of load conditions. The apparatus includes a condition module that determines whether the power supply is in a high load state or a low load state. A high load module ensures that the load receives power through the power supply's high load power train if the load state is the high load state. A low load module ensures that the load receives power through the power supply's low load power train if the load state is the low load state. The high load power train is optimized for efficiency under high power conditions, while the low load power train is optimized for efficiency under low power conditions. The power supply thus operates with the most efficient power train for the particular load conditions, improving the net efficiency of the power supply.07-01-2010
20100164447STATIC-DYNAMIC-DYNAMIC REPEATER CIRCUIT - A repeater circuit. The repeater circuit includes two input circuits, two intermediate circuits, and two output circuits. Responsive to a transition of an input signal from one logic level to another level, one of the input circuits is activated. The corresponding intermediate circuit is activated corresponding to activation one of the input circuits, and in turn, the corresponding output circuit is activated, which then drives an output signal on an output node. After a delay, a feedback signal conveyed via a feedback path deactivates the corresponding intermediate circuit and the corresponding output circuit. After deactivation of the corresponding output circuit, a keeper circuit continues to provide the output signal on the output node. The other one of the two input circuits inhibits activation of the other one of the intermediate circuit responsive to the transition, which results in the other output circuit also being inhibited from activation.07-01-2010
20110193541CURRENT LIMITING CIRCUIT - An exemplary aspect of the present invention is a current limiting circuit including: an output transistor that controls a current flowing to a load from a power supply; a current sense transistor through which a current dependent on a current flowing through the output transistor flows; a sense resistor connected in series with the current sense transistor; a potential difference detection unit that detects a potential difference generated between both ends of the sense resistor; a constant current generation unit that supplies a constant current to the potential difference detection unit; and a control unit that controls a conduction state of the output transistor based on a control voltage generated based on the potential difference and the constant current, in which the sense resistor is disposed so as to surround the potential difference detection unit.08-11-2011
20110193540Enhancement of Power Supply Rejection for Operational Amplifiers and Voltage Regulators - A scheme for enhancement of the power-supply ripple rejection for operational amplifiers (op-amps) and low-dropout (LDO) voltage regulators is described. The scheme adds calculated amounts of current derived from the power-supply ripple with the input differential pair current to cancel off the output ripple, improving the high-frequency power-supply ripple rejection without requiring a substantial redesign of the circuitry involved.08-11-2011
20110193539Switching Regulator with Offset Correction - A switching regulator generally includes an output circuit, a comparator, an on-time timer and an error amplifier. The output circuit receives an input voltage and produces an output voltage. The comparator causes the output circuit to turn on the output voltage when a feedback voltage falls below a first reference voltage. The on-time timer causes the output circuit to turn off the output voltage after a time-out period. The error amplifier receives the feedback voltage and a second reference voltage and produces the first reference voltage.08-11-2011
20110193538Domino voltage regulator (dvr) - A low dropout voltage regulator comprising a first output voltage regulation loop with a NMOS transistor as a pass element and a second output voltage regulation loop with a PMOS transistor as a pass element. The NMOS transistor is used for small current loads up to 1 mA, the PMOS transistor is used for higher current loads from 1 mA and up. A current sense buffer senses the current through the NMOS transistor and controls the gate of the PMOS transistor accordingly. Good load transient operation is achieved without the need of an external load capacitor.08-11-2011
20100117610Bootstrap circuit and bulk circuit thereof - A bootstrap circuit is utilized in a bulk circuit using an NMOS transistor as a power switch. The bootstrap circuit includes a first PMOS transistor coupled between an internal power source and an offset capacitor, and a second PMOS transistor coupled between the gate of the first PMOS transistor and the offset capacitor, and an NMOS transistor coupled between the gate of the first PMOS transistor and ground. When the power switch is turned on, the second PMOS transistor is turned on for turning off the first PMOS transistor. When the power switch is turned off, the NMOS transistor is turned on for turning on the first PMOS transistor.05-13-2010
20100072964VOLTAGE REGULATOR INCLUDING CONSTANT LOOP GAIN CONTROL - A voltage regulation circuit includes a power stage for generating a regulated output voltage responsive to an input voltage and at least one PWM signal. A voltage divider circuit is connected to the output of the power stage and generates a feedback voltage. First circuitry generates the at least one PWM signal responsive to a voltage error signal, a filtered output voltage signal and a ramp voltage signal. The filtered output voltage is used for substantially removing loop gain change caused by the voltage divider circuit. A voltage compensation circuit generates the voltage error signal responsive to a feedback voltage and a reference voltage.03-25-2010
20100072965OUTPUT VOLTAGE FEEDBACK DEVICE FOR BEING USED IN A POWER SUPPLYING APPARATUS AND POWER SUPPLYING APPARATUS PROVIDED WITH THE SAME - The present invention relates to an output voltage feedback device for being used in a power supplying apparatus and a power supplying apparatus provided with the same. The power supplying apparatus provides electrical power via a wire set which includes a high level wire and a low level wire. The output voltage feedback device is provided with a voltage sensor and feedback unit for determining the voltage difference between the high level wire and the low level wire and the resultant measurement is transmitted back to the converter main body via the wire set in the form of a distinct electrical signal. The output voltage feedback device according to the invention can accurately determine the output voltage from the power supplying apparatus and, in case of occurring an output fault, interrupt the supply of power or enable an automatic compensation to reduce damage.03-25-2010
20100072963Power management chip with dual function pin - The present invention discloses a power management chip with a dual function pin, the power management chip outputting pulse-width-modulation signals to control the switching of an up-gate transistor and a low-gate transistor for converting an input voltage to an output voltage, the up-gate and low-gate transistors being electrically connected to a node, the power management chip comprising: a dual function pin for electrically connecting with the input voltage or the node; a voltage sensing circuit electrically connected with the dual function pin for detecting the level of the input voltage; and a clock detection circuit electrically connected with the dual function pin for determining whether the signal received by the dual function pin is an oscillation signal.03-25-2010
20100033145DCR sense for a COT power converter - A DCR sense scheme is provided to sense the inductor current of a COT power converter. The DCR sense is implemented by using the direct current resistance of the output inductor of the COT power converter, and thus eliminates the ESR limitations on the type of output capacitors for stability concern. A quick response mechanism is further incorporated in the COT power converter to speed up the transient response of the COT power converter.02-11-2010
20130033247VOLTAGE REGULATOR - A voltage regulator has a phase compensation circuit which changes consumption current according to load current thereby to reduce consumption current. The phase compensation circuit includes: a first transistor having a drain connected to an output terminal of an error amplifier circuit; a second transistor having a drain connected to a gate of the first transistor and a gate connected to the gate of the first transistor; a current mirror circuit connected to the output terminal of the error amplifier circuit, a drain of the first transistor, and the drain of the second transistor; and a capacitor connected between the gate of the second transistor and a drain of an output transistor. Thereby, current consumed by the phase compensation circuit can be changed according to the load current, resulting in that the voltage regulator consumes less current.02-07-2013
20130033246POWER MANAGEMENT FOR LOADS SUPPLIED WITH POWER FROM WILD SOURCES - A solid-state power regulator (SSPR) regulates power delivered to a frequency tolerant load from a wild-source generator. The SSPR includes a solid-state switching device and a controller. The solid-state switching device is turned On to deliver power from the wild-source generator to the frequency-tolerant load and Off to prevent the delivery of power to the frequency-tolerant load. The controller monitors the power delivered to the frequency-tolerant load and selectively modulates the solid-state switching device to regulate the power delivered.02-07-2013
20130043851CONTROL CIRCUIT AND CONTROL METHOD FOR SWITCHING POWER SUPPLY, AND SWITCHING POWER SUPPLY AND ELECTRONIC APPARATUS USING CONTROL CIRCUIT AND CONTROL METHOD - The present invention improves the efficiency of a switching power supply in a light load. A control circuit is configured to repeat a driving duration enabling the switching element to be switched and a stop duration stopping the switching in a light load state. A pulse signal generating portion generates a driving pulse signal, in which the driving pulse signal at least includes a pulse in the driving duration, and the lighter a load is, the less the number of pulses in the driving duration is. A first driver drives a first switching transistor according to the at least one pulse in the driving pulse signal other than predetermined K pulses (K is a natural number). The K pulses are in the driving pulse signal when the number of the pulses is reduced to K.02-21-2013
20100045253CYCLICAL DC VOLTAGE CONVERTER FOR SUPPRESSING VOLTAGE SPIKES AND OSCILLATIONS - A DC voltage converter is provided that cyclically converts an input-side supply voltage into an output voltage. The converter includes an inductive storage element connected between a terminal for the supply voltage and, in a manner such that it is coupled via a first switch, a reference potential terminal. The capacitively buffered output voltage terminal is connected, via a second switch, between the inductive storage element and the first switch. Provision is furthermore made of a third switch, which is intended to selectively short the inductive storage element that is connected in parallel and is controlled by a control circuit. The control circuit is controlled, on the input side, by a control voltage that is tapped off at the second terminal of the inductive storage element.02-25-2010
20100045252POWER SUPPLY CIRCUIT - When an output of an overall output terminal (02-25-2010
20100045251VOLTAGE OUTPUT CIRCUIT, INTEGRATED CIRCUIT AND ELECTRONIC DEVICE - A voltage output circuit has a controller controlling ON/OFF switching of a first switch which switches ON/OFF voltage transformation by a first charge pump circuit in order to turning a first voltage outputted from a first voltage output terminal into a desired value, a second charge pump circuit transforming the voltage with the use of an electric power obtained by storing an input voltage according to ON/OFF of the first switch and outputting the voltage as a second voltage, a second switch selecting whether to store the electric power used for transformation by the second charge pump circuit, and a switching unit switching ON/OFF the second switch on the basis of the second voltage outputted from a second voltage output terminal. The circuit having a simple configuration can transform the input voltage and output desired positive and negative voltage, while accomplishing a reduction in cost and size of the circuit.02-25-2010
20100045249VOLTAGE REGULATOR FOR WRITE/READ ASSIST CIRCUIT - A push-pull voltage regulator configured to selectively provide power to used portions of a memory array is presented. The push-pull voltage regulator includes a voltage-up regulator, which provides a reference voltage to an SRAM array, and a voltage-down regulator, which controls removal of excess charge from the SRAM array. The voltage-down regulator consists of a plurality of amplifier stages with a plurality of inputs, a plurality of inverters, a gain amplifier, a biasing transistor, and a NMOS drainage transistor. The gate terminal of the NMOS drainage transistor is coupled to an output of the voltage-down regulator. A first output terminal of the NMOS drainage transistor coupled to an output node of the push-pull voltage regulator and a second output terminal of the NMOS drainage transistor coupled to ground. When activated, the NMOS drainage transistor transfers excess charge from the SRAM array to ground.02-25-2010
20100045248Bi-directional Boost-Buck Voltage Converter - A bi-directional Boost-Buck voltage converter includes a controller, a high-voltage capacitor, a lower-voltage battery, a resistive load, an inductor, and three or four switches, and provides a mechanism to efficiently provide power to the resistive load from the battery. It uses two configurations of the switches to configure the battery, the inductor, and the capacitor in a boost converter configuration to charge the capacitor from the battery. It uses two different configurations of the switches to configure the capacitor, the inductor, and the resistive load in a buck converter configuration to discharge the capacitor through the inductor and the resistive load.02-25-2010
20090189578LOW RIPPLE DC TO DC POWER CONVERTER - A low ripple DC to DC power converter comprises a first switch, a second switch, an inductor, a driving circuit, and an oscillating circuit. The driving circuit is used to control the first switch and the second switch based on a driving signal. The driving signal has a duty cycle. The oscillating circuit comprises a first oscillating signal and a second oscillating signal. The first oscillating signal has a first pulse width and the second oscillating signal has a second pulse width. The oscillating circuit is used to generate a pulse oscillating signal, where the frequency of the pulse oscillating signal is modulated based on the duty cycle, the first pulse width, and the second pulse width so as to reduce the ripple of the output voltage.07-30-2009
20130038305Direct Current Voltage Conversion Circuit - The invention proposes a direct current voltage conversion circuit which can operate as a step-up circuit, a step-down circuit, or operate as a step-up or step-down circuit depending on the modes of operation.02-14-2013
20130038304METHOD OF FORMING A SEMICONDUCTOR POWER SWITCHING DEVICE AND STRUCTURE THEREFOR - At least one exemplary embodiment is directed to a semiconductor power switching device including a ctrl switch, a sync switch, where a resistor is electrically connected between the ctrl switch and the sync switch.02-14-2013
20090096436DC-DC CONVERTER - A DC-DC converter includes a series circuit of a main switch and a choke coil and an output capacitor connected to one end of the series circuit and outputs a DC voltage from the one end of the series circuit. A first MOS transistor is connected in parallel to the series circuit and a second MOS transistor is connected in parallel to the output capacitor. A control circuit controls the gate voltages of the first MOS transistor and/or the second MOS transistor so that the first MOS transistor and/or the second MOS transistor outputs a changed target output voltage, whereby the output voltage is made equal to the target voltage at high speed.04-16-2009
20100109626Power factor correction power supply unit, and control circuit and control method used in the same - A power factor correction power supply unit for correcting a power factor includes a switching device, an input voltage detection circuit, an output voltage detection circuit, an error amplifier for outputting an error signal obtained by amplifying a difference between an output voltage detection signal and a reference voltage, an ON width generation circuit for generating an ON time width, an OFF width generation circuit for generating an OFF time width of the switching device, and a switching device driving circuit. The drive circuit conducts an ON/OFF control over the switching device upon receiving a turn-on timing signal for turning on the switching device as soon as the OFF time width is terminated and upon receiving a turn-off timing signal for turning off the switching device as soon as the ON time width is terminated.05-06-2010
20100109629POWER SUPPLY APPARATUS - In a power supply apparatus that is so configured as to produce from an input voltage an output voltage Vo within a predetermined permissible variation range, the output voltage Vo is so controlled as to decrease within the permissible variation range as the output current Io increases. This configuration offers an output voltage with an improved transient characteristic against an abrupt variation in the output current and simultaneously permits reduction of the power consumed when the output current increases05-06-2010
20100109631TUNABLE VOLTAGE ISOLATION GROUND TO GROUND ESD CLAMP - A tunable voltage isolation ground to ground ESD clamp is provided. The clamp includes a dual-direction silicon controlled rectifier (SCR) and trigger elements. The SCR is coupled between first and second grounds. The trigger elements are also coupled between the first and second grounds. Moreover, the trigger elements are configured to provide a trigger current to the dual-direction silicon controlled rectifier when a desired voltage between the first and second grounds is reached.05-06-2010
20100109627POWER CIRCUIT INCLUDING STEP-UP CIRCUIT AND STABILIZING METHOD THEREOF - A power circuit includes a reference potential circuit, a step-up circuit, and a conversion circuit. The reference potential circuit generates a reference potential. The step-up circuit generates a desired internal potential by stepping up a power supply potential. The step-up circuit includes a comparison circuit, a differential amplifier circuit, and a switch element. The comparison circuit outputs the result of comparison between a potential and the reference potential. The differential amplifier circuit is turned on or off by the operation control signal. The switch element performs on/off control according to the operation control signal and resets the output potential of the differential amplifier circuit. The conversion circuit converts the of the operation control signal so as to make longer the on period of the differential amplifier circuit and the off period of switch element.05-06-2010
20100109630NON-LINEAR PWM CONTROLLER FOR DC-TO-DC CONVERTERS - A nonlinear PWM controller for switching power supplies05-06-2010
20100109625SWITCHING REGULATOR AND CONTROL CIRCUIT THEREOF - Multiple switching transistors are provided in parallel. An output circuit includes an inductor, an output capacitor, and a rectifying device. A pulse modulator generates a pulse signal with the duty ratio adjusted such that the output voltage of a switching regulator approaches a predetermined target value. A driver distributes a pulse signal to the multiple switching transistors, and switches the multiple switching transistors to the ON state in a time divisional manner.05-06-2010
20110001458VOLTAGE REGULATOR - Described herein are principles for designing and operating a voltage regulator that will function stably and accurately without an external capacitance for all or a wide range of load circuits and characteristics of load circuits. In accordance with some of these principles, a voltage regulator is disclosed having multiple feedback loops, each responding to transients with different speeds, that operate in parallel to adjust an output current of the regulator in response to variations in the output current/voltage due to, for example, variations in a supply voltage and/or variations in a load current. In this way, a voltage regulator can respond quickly to variations in the output current/voltage and can avoid entering an unstable state.01-06-2011
20130082673SWITCHING DEVICE AND METHOD OF CONTROLLING SWITCHING DEVICE - A switching device is disclosed in which electric current through a rectification circuit, depending on whether a main switching element turns on or off, and thus electric current from the rectification circuit flows through whichever of first and second sub-switching elements, turns on. By controlling the turning on and off of the first and second sub-switching elements, the switching is performed which determines through which of the first and second output circuits the electric current from the rectification circuit flows. Thus, a voltage that is a result of transforming a voltage from a DC power supply in response to the electric current flowing through the first output circuit, is output from a first output terminal, and a voltage that is a result of transforming a voltage from the DC power supply in response to the electric current flowing through the second output circuit, is output from a second output terminal.04-04-2013
20100007317BUCK-BOOST PFC CONVERTERS - A buck-boost PFC converter is provided and includes an inductor, first and second transistors, a first diode, and a control circuit. The inductor has a first terminal and a second terminal. The first transistor is coupled to a positive-power rail and the first terminal of the inductor. The second transistor is coupled to the second terminal of the inductor and a negative-power rail. The first diode is connected from the second terminal of the inductor to an output of the buck-boost PFC converter. The control circuit generates a first signal and a second signal coupled to control the first transistor and the second transistor respectively. The first signal is utilized to turn on the first transistor for conducting the positive-power rail to the inductor. The second signal is utilized to turn on the second transistor for conducting the inductor to the negative-power rail.01-14-2010
20080290848VOLTAGE REGULATOR WITH MANAGED GATE-DRIVE VOLTAGE - A system may include control of a voltage regulator to provide a regulated output voltage and output current to a load coupled to an output node of the voltage regulator, and changing of a gate-drive supply voltage provided to the voltage regulator based on the output current.11-27-2008
20100066325SEMICONDUCTOR DEVICE - The adverse effect of noise a constant voltage receives in a semiconductor device capable of data communication through wireless communication is suppressed. Further, communication is performed normally with a constant voltage with less noise even in the case where the amount of received power is large. The semiconductor device includes an input circuit for generating a DC voltage from an AC signal, a circuit for generating a constant voltage lower than the DC voltage, a circuit portion supplied with the constant voltage, a filter, and a feedback circuit for changing impedance with the constant voltage input from the circuit for generating a constant voltage, wherein the filter is electrically connected between the input circuit and the circuit for generating a constant voltage.03-18-2010
20090045791SWITCHING REGULATOR - An exemplary switching regulator, is provided. The switching regulator includes an oscillator, a PWM logic controller, an inductor, a capacitor, a switch, a driver, a current sense amplifier, and a minimum power pulse width generator. The current sense amplifier and the minimum power pulse width generator compose a first feedback loop for generating a first feedback signal to the PWM logic controller.02-19-2009
20100327829Monitoring and control circuit for adjusting current - A monitoring and control circuit comprises a sense block, a first and a second comparators, and a control module. The current sense block is coupled to a switch for generating a monitoring signal indicative of a current flowing through the switch. The first comparator coupled to the sense block is operable for comparing the monitoring signal to a first threshold and for providing a first signal according to a first comparison result between the monitoring signal and the first threshold. The second comparator coupled to the sense block is operable for comparing the monitoring signal to a second threshold and for providing a second signal according to a second comparison result between the monitoring signal and the second threshold. The control module coupled to the first comparator and the second comparator provides a control signal for controlling the switch according to the first signal and the second signal so as to adjust the current.12-30-2010
20130088211DIRECT CURRENT CONVERTER WITH CUK-CIRCUITRY AND LOAD CURRENT DETECTION - The invention relates to a direct current converter with Cuk-circuit and a measuring resistor for load current detection, wherein the Cuk-circuit has a switching diode, and wherein the measuring resistor is arranged in series to the switching diode.04-11-2013
20130088210Power System and Power Controlling Method and Apparatus Thereof - A power controlling method includes the following steps. A first Proportional Integral (PI) computation is performed according to an input current signal and command. Next, whether the input current signal is greater than a maximum rated charging current of a battery unit is determined to generate a switching signal for controlling a brake unit correspondingly. Then, a second PI computation is performed in accordance with the output voltage signal and a predetermined voltage command. Thereafter, the output voltage signal and the voltage command are compared to set an output current command selectively. Next, a third PI computation is performed in accordance with the output current signal and command to adjust a first pair of switching signals and a second pair of switching signals, such that a switching unit performs a corresponding switching action to adjust the output voltage signal. A power system and a power controlling apparatus are provide.04-11-2013
20100001702SINGLE PIN MULTI-VID BIT INTERFACE CIRCUIT FOR DYNAMIC VOLTAGE CHANGE OF A DC/DC CONVERTER - A controller for a DC/DC converter is provided. The controller comprises an error circuit, control logic, a high side driver, a low side driver, and an interface circuit. The error circuit is coupled to a feedback terminal so as to receives a feedback signal and is coupled to the control logic. The high side driver is coupled to the control logic and to a first output terminal so as to provide a first actuation signal, and the low side driver is coupled to the control logic and to a second output terminal so as to provide a second actuation signal. The interface circuit is also coupled to the control logic, including a first, second, and third voltage source, interface comparators, and current limited amplifier.01-07-2010
20100033148Voltage Reference Circuit with Fast Enable and Disable Capabilities - A circuit for providing an output voltage substantially equal to a reference voltage includes: a low drop-out (LDO) regulator coupled to the reference voltage for producing the output voltage at an output terminal; a reference current source having a first end and a second end for providing a predetermined reference current; a first transistor having a first terminal coupled to a first supply voltage, a second terminal, and a control terminal coupled to the second terminal of the first transistor; a first switch for selectively coupling the second terminal of the first transistor to the first end of the reference current source according to a first control signal; and a second transistor having a first terminal coupled to the first supply voltage, a control terminal coupled to the control terminal of the first transistor, and a second terminal coupled to the output terminal.02-11-2010
20130069610DC-DC CONVERTER CONTROL APPARATUS - In a DC-DC converter control apparatus, it is configured to have a current sensor for detecting a current flowing through a positive electrode wire connecting the second common terminal with the positive electrode terminal of the high-voltage port and to control operations of the first and second switching elements based on the current detected by the current sensor. With this, it becomes possible to accurately detect the current of the windings and appropriately control the operation of the switching elements based on the detected currents without increasing the transformer in size.03-21-2013
20130069609AVERAGE INDUCTOR CURRENT CONTROL USING VARIABLE REFERENCE VOLTAGE - A variable reference voltage generation unit used in DC/DC converter includes a sample-hold valley inductor current unit electrically connected to a reference voltage generation unit. The sample-hold valley inductor current unit receives the valley inductor current and converts it into the valley voltage. The reference voltage generation unit receives and converts a current signal two times of a designated current into a voltage signal two times of a designated voltage. The voltage signal two times of reference voltage is then subtracted by the valley voltage to produce the new reference voltage to compare with an inductor voltage for controlling the switching of a switching transistor of the DC/DC convertor.03-21-2013
20100134082APPARATUS FOR DELIVERING HARMONIC INDUCTIVE POWER - Method and apparatus for providing harmonic inductive power, and more particularly for delivering current pulses providing a desired amount of pulse energy in high frequency harmonics to a load circuit for inductive heating of an article. By controlling the shape and/or frequency of such current pulses, the apparatus and method can be used to enhance the rate, intensity and/or power of inductive heating delivered by the heater coil and/or to enhance the lifetime or reduce the cost and complexity of an inductive heating power supply. Of particular significance, the apparatus and method may be used to significantly increase the power inductively delivered to a ferromagnetic or other inductively heated load, without requiring an increase of current in the heater coil. This enables new heating applications, and in some known applications, decreases the energy consumption or cooling requirements and/or increase the lifetime of the heater coil.06-03-2010
20100134081DC-DC CONVERTER - A DC-DC converter for generating an output voltage from input voltage, includes: an output stage for outputting the output voltage; an error amplifier having an input and a reference input for receiving a feedback voltage at the input in accordance with the output voltage and for receiving a reference voltage at the reference input, the error amplifier generating an amplified voltage for driving the output stage, the amplifier voltage corresponding to the difference between the feedback voltage and the reference voltage; a phase compensation unit for generating a phase compensation component to the feedback voltage; and a phase compensation controller for controlling the phase of the phase compensation unit; wherein the feedback voltage is determined by the output voltage plus said phase compensation component.06-03-2010
20090309564METHOD FOR CONTROLLING A VOLTAGE REGULATOR, IN PARTICULAR A CONVERTER OF THE MULTIPHASE INTERLEAVING TYPE AND CORRESPONDING CONTROLLER - An embodiment of method is described for controlling a voltage regulator of the type comprising at least one modulator of the PWM type, the method comprising: 12-17-2009
20090115385Dual circuit wall switch occupancy sensor and method of operating same - A method and apparatus are provided for detecting occupancy in an area using multiple detection technologies (e.g., ultrasound and infrared sensing) to intelligently control switching of plural load circuits whereby one of the circuits is affected by photocell control. A programmable controller implements auto-on, manual-on, reversion to auto-on and override operations with respect to the separately controlled load circuits based on sensor outputs and user inputs. An improved power supply for an occupancy sensor and load control device employs a DC voltage derived from leakage AC voltage between line and ground to drive the sensors and other circuits, and a switching regulator with a switching cycle controlled by a pulse width modulated (PWM) subsystem of the apparatus, allowing synchronous, delayed or exclusive operation relative to the sensing technology such as the US transmitter.05-07-2009
20090102444DC-DC CONVERTER - A DC-DC converter, which controls the output voltage supplied to a load at a desired magnitude by performing on/off control of the input voltage using a switch, includes: an error amplifier for outputting the difference voltage between the output voltage and a preset reference voltage; and a plurality of phase compensation circuits for compensating the phase of the output voltage fed back to the error amplifier with different characteristics, whereby the DC-DC converter is configured such that changes in either the input voltage or in the load current flowing into the load are detected, and switching between the plurality of phase compensation circuits is performed. The frequency characteristic of each of the phase compensation circuits is determined for each of a plurality of demarcated fluctuation ranges of the input voltage or the load current.04-23-2009
20090302817DC/DC CONVERTER CONTROL CIRCUIT AND DC/DC CONVERTER CONTROL METHOD - A DC-DC converter has an error amplifier, a first control unit and an oscillator. The error amplifier amplifies an error voltage between an output voltage and a set voltage, the output voltage being outputted from an inductance element by feeding an input voltage to an inductance element in a predetermined cycle. The first control unit: controls the output voltage to a set voltage by causing a switching operation of a switch element in response to an output of the error amplifier, the switch element forming a path for input voltage feed to the inductance. The oscillator generates a periodical signal at the time of switching the switch element. The oscillator handles an oscillation cycle as a short cycle in comparison to any prior cycles, in response to a drop in the output voltage from the set voltage by an amount equivalent to a first voltage value or more.12-10-2009
20090302815VOLTAGE REGULATOR SYSTEM - The present disclosure includes circuits, systems and methods for regulating voltage. One voltage regulator system embodiment includes a voltage regulator having an output and a number of stages coupled in parallel to the output of the voltage regulator. Each stage includes a source follower circuit, and a sample and hold circuit coupled in series between the output of the voltage regulator and an input of the source follower circuit.12-10-2009
20120217944CURRENT DETECTOR OF INDUCTIVE LOAD - A current detector of an inductive load includes: an inductive load 08-30-2012
20120217943DC/DC Converter Cell and Circuit with Feedback Capability, and Method for its Operation - A DC/DC converter circuit having feedback capability with a first converter device whose two inputs form the inputs of the DC/DC converter circuit and can be connected to a DC voltage source. The DC/DC converter circuit has a DC voltage-coupled second converter device whose outputs form the outputs of the DC/DC converter circuit and can be connected to a DC voltage sink, wherein the second converter device is in the form of a DC/DC converter cell or of a DC/DC converter cell arrangement having two DC/DC converter cells.08-30-2012
20130057242CONSTANT-ON-TIME MULTI-PHASE SWITCHING VOLTAGE REGULATOR AND RELATED METHOD OF GENERATING A REGULATED VOLTAGE - A switching voltage regulator including a comparison module configured to receive a reference voltage and a feedback voltage and to generate a comparison signal corresponding to a difference between the reference voltage and the feedback voltage, an offset module configured to generate an offset signal based on a number of active phases of the voltage regulator, an adder configured to generate a control signal based on the comparison signal and the offset signal, a plurality of pulse-width-modulated (PWM) power stages, and a control module configured to control the plurality of PWM power stages based at least in part on the control signal generated by the adder.03-07-2013
20090091308SWITCHING REGULATOR AND ELECTRONIC DEVICE HAVING SAME - A switching regulator (04-09-2009
20120187932Voltage Converter and Method for Voltage Conversion - A voltage converter (07-26-2012
20090284237POWER SUPPLY APPARATUS AND ELECTRICAL DEVICE THEREWITH - A direct-current stabilized power supply apparatus according to the present invention includes offsetting means that keeps a slope voltage (Vslp) shifted from the ground potential to a higher potential by a predetermined offset voltage ΔV so that the lower limit level of the slope voltage (Vslp) is higher than that of an error voltage (Verr). With this configuration, it is possible to provide a direct-current stabilized power supply apparatus that can appropriately control a duty ratio without causing oscillation or the like in the overall system, and also to provide an electrical device incorporating such a power supply apparatus.11-19-2009
20100007316Current Sensing In a Buck-Boost Switching Regulator Using Integrally Embedded PMOS Devices - A current sense device for a power transistor is described. The power transistor is formed in a cellular structure including a cellular array of transistor cells. The current sense device includes multiple transistor cells in the cellular array of transistor cells of the power transistor being used as sense transistor cells. The sense transistor cells are evenly distributed throughout the cellular array where the source terminal of each sense transistor cell is electrically connected to a first node through a metal line in the first metal layer and through a metal line in the second metal layer where the metal lines are electrically isolated from the metal lines connecting the transistor cells of the power transistor. The sense transistor cells measure a small portion of the current flowing through the power transistor based on the size ratio of the current sense device and the power transistor.01-14-2010
20100127683SEMICONDUCTOR DEVICE INCLUDING A DC-DC CONVERTER - The electrical characteristics of a semiconductor device are enhanced. In the package of the semiconductor device, there are encapsulated first and second semiconductor chips with a power MOS-FET formed therein and a third semiconductor chip with a control circuit for controlling their operation formed therein. The bonding pads for source electrode of the first semiconductor chip on the high side are electrically connected to a die pad through a metal plate. The bonding pad for source electrode of the second semiconductor chip on the low side is electrically connected to lead wiring through a metal plate. The metal plate includes a first portion in contact with the bonding pad of the second semiconductor chip, a second portion extended from a short side of the first portion to the lead wiring, and a third portion extended from a long side of the first portion to the lead wiring.05-27-2010
20100127675LOW VOLTAGE POWER SUPPLY - A buck regulator for converting an input DC voltage, V05-27-2010
20090267580DC-DC CONVERTER WITH SWITCHABLE ESTIMATORS - A DC-DC converter is provided with a first estimator unit (RAE, RLPF, RHPF) for performing an accurate control signal estimation and a second estimator unit (FEU, ΔVEU) for performing a fast control signal estimation. In addition, a switching unit (SU) is provided for switching to an output of the first estimator unit (RAE, RLPF, RHPF) during almost constant control signal conditions and for switching to an output of the second estimator unit (FEU, ΔVEU) during changing control signal conditions to provide an estimation on the required control signal.10-29-2009
20090267581Hybrid switched mode/linear mode power amplifier control - In one aspect of the exemplary embodiments of this invention a method includes determining, based at least in part on a number of resource blocks to be transmitted, where the resource blocks may be spectrally contiguous or spectrally non-contiguous, a ratio of power to be provided by a switched mode power supply to power to be provided by a linear mode power supply; controlling the switched mode power supply and the linear mode power supply in accordance with the determined ratio to supply a total amount of power and providing the total amount of power to a supply voltage input of a polar transmitter.10-29-2009
20090058384REFERENCE VOLTAGE GENERATING CIRCUIT AND TIMER CIRCUIT - A reference voltage generating circuit includes a constant current source circuit connected with a power supply voltage and configured to output a reference current to an output node based on the power supply voltage. A current-voltage converting circuit is connected the output node and generates a reference voltage to the output node based on the reference current. A first voltage adjusting circuit is connected with the output node and is configured to adjust dependence of the reference voltage on the power supply voltage in a positive direction. A second voltage adjusting circuit is connected with the output node and is configured to adjust dependence of the reference voltage on the power supply voltage in a negative direction.03-05-2009
20090058383Switching DC-DC converter with adaptive-minimum-on-time control and method of adaptively controlling minimum-on-time of a switching DC-DC converter - A power converter includes a power switch adapted to receive an input power from an external power source and to generate an output power, and an adaptive oscillator adapted to output an adaptive minimum-on signal of the power switch in response to a change in measured magnitude of at least one of the input power and the output power.03-05-2009
20120223690DC-DC CONVERTER CONTROL CIRCUIT AND CONTROL METHOD - A control circuit of a DC-DC converter that has a switching element, including an error amplifier that amplifies a difference between a reference voltage and a feedback voltage corresponding to an output voltage of the DC-DC converter, a voltage reduction comparator that outputs an interrupt signal when the feedback voltage is lower than a voltage reduction threshold that has a value lower than that of the reference voltage, and a pulse-width modulation (PWM) signal generator circuit. The PWM signal generator circuit generates a PWM signal of a predetermined frequency based on the voltage difference when no interrupt signal is generated, or otherwise generates a switch drive signal to activate the switching element for a first period of time corresponding to the difference output by the error amplifier, and to deactivate the switching element for a second period of time after the first period of time has elapsed.09-06-2012
20120223689DEVICE OF INDUCTANCE DETECTION AND THE METHOD USING THE SAME - The disclosure is a device of inductance detection, which includes: a controller, a current pulse generator, and a detector. The controller generates a control signal and an enable signal to the switching regulator according to a judge signal. The switching regulator then generates an output voltage. The current pulse generator is coupled to the controller and generates a current pulse signal to the object according to the control signal. The detector is coupled to the object and the current pulse generator, and is used to detect a reflective signal responded by the object after the object receives the current pulse signal. The detector then generates a judge signal according to the reflective signal.09-06-2012
20110012576POWER SUPPLY CIRCUIT AND RECEIVING APPARATUS - A power supply circuit includes: a DC-to-DC converter outputting a first voltage dropped from an input supply voltage; and a series regulator outputting a second voltage dropped from an output of the DC-to-DC converter, the series regulator including: an output transistor supplied with the output of the DC-to-DC converter and outputting the second voltage, and a first control circuit operated by the input supply voltage and controlling the output transistor.01-20-2011
20110012575DC TO DC SWITCHING POWER CONVERTER CONTROLLER USING SPREAD SPECTRUM PWM - A switching power converter converts an input DC voltage to an output DC voltage using a switch to selectively connect an input DC voltage energy source. A switching controller controls the switch. A pulse width modulation centering signal is generated by a spread spectrum clock signal generator. An error amplifier of the switching controller generates an analog error signal based on a switching voltage measured after the switching of the switching power converter, the output voltage of the switching power converter, the pulse width modulation centering signal and a reference. A pulse width modulated signal generator generates the pulse width modulation signal to control the switch of the switching power converter based on the pulse width modulation centering signal and the analog error signal.01-20-2011
20110012574INTERLEAVED/ALL-PHASE MODE SWITCHED PWM SYSTEM - A multi-phase power switching converter having first and second states includes a pulse width modulator having an output, a converter output providing an output signal, and a plurality of drivers, each having an output electrically coupled to the converter output and an input. When the converter is in the first state where a duty cycle of the converter is less than or equal to 100 divided by the number of drivers, each of the driver inputs is configured to be sequentially electrically coupled to the pulse width modulator output. When the converter is in the second state where the duty cycle of the converter is greater than 100 divided by the number of drivers, each of the driver inputs is simultaneously electrically coupled to the pulse width modulator output.01-20-2011
20110037447Component Powered by HDMI Interface - A HDMI (High-Definition Multimedia Interface) transmitter component may be operated solely on power that is scavenged and converted from termination tail current received while the HDMI transmitter component is coupled to an HDMI compliant sink connector on a HDMI receiver component. The termination tail current is received at the transmitter component from a plurality of differential HDMI signals from terminators on a receiver component. A portion of the received tail current is converted to form a supply voltage Vdd source. Function logic on the transmitter component is operated using the Vdd voltage, and the function logic is configured to control the plurality of differential signals.02-17-2011
20130063112CONTROLLER AND POWER CONVERTER USING THE SAME FOR CLAMPING MAXIMUM SWITCHING CURRENT OF POWER CONVERTER - A controller of a power converter is provided. The controller includes a feedback circuit, an output circuit, and a clamping circuit. The feedback circuit generates a feedback signal in accordance with output of the power converter. The output circuit generates a switching signal in accordance with the feedback signal for regulating the output of the power converter. The clamping circuit limits the feedback signal under a first level for a first load condition and limits the feedback signal under a second level for a second load condition. The clamping circuit includes a timer circuit. The timer circuit determines a slew rate of the feedback signal for increasing the feedback signal from the first level to the second level, and the second level is higher than the first level.03-14-2013
20130063113LOAD CURRENT SENSING CIRCUIT AND METHOD - A load current sensing circuit for sensing a DC-DC converter load current in a DC-DC converter comprising a high-side power transistor and a low-side power transistor connected in series between supply terminals and having a converter switching node therebetween coupled to an inductor to which a load is to be coupled. A first averaging stage determines a DC voltage component of the PWM signal and a second averaging stage determines a DC component of the voltage signal at the converter switching node. A comparison stage determines a difference voltage between the first averaging stage and the second averaging stage. An impedance replica stage forms a resistance which is proportional to the resistance of the series-connected power transistors. A measuring stage measures a current flowing through the impedance replica stage with the determined difference voltage applied.03-14-2013
20120194152VOLTAGE CONTROLLED CURRENT SOURCE FOR VOLTAGE REGULATION - A system and method for providing a voltage controlled current source for bus regulation is disclosed. A bus current delivered to an electrical bus from a current source is controlled using a synchronous switch according to a PWM duty cycle. Further, the PWM duty cycle is controlled to be proportional to an error signal based on a comparison of a voltage of the electrical bus to a reference voltage.08-02-2012
20120194151STANDBY CURRENT REDUCTION THROUGH A SWITCHING ARRANGEMENT WITH MULTIPLE REGULATORS - Consistent with an example embodiment, there is a power regulator arrangement with variable current capacity providing power from a power supply to a load having variable demand. As a load, a high-performance microprocessor has several modes of operation. At the highest speed setting, it demands a lot of current. At slower clock speeds and during state retention, the processor has a very low current consumption. Using a single regulator, the current efficiency may be very low during long standby periods. To increase the efficiency even at lower load currents, a scheme is based on parallel operation of multiple regulators having different load ranges, for example, a “low, “medium,” and “high” range regulators. Having knowledge of the load current profile, the regulators can be adjusted such that the peak of the efficiency curve matches the load profile of the regulator. The efficiency of the power regulator arrangement is enhanced throughout the range of power demanded by the load.08-02-2012
20090237052CONTROL APPARATUS FOR CONTROLLING POWER CONVERSION APPARATUS - The control apparatus is for controlling a power conversion apparatus with a chopper circuit including at least one voltage-controlled type switching element provided with a drive circuit, and a coil to generate back electromotive force. The control apparatus includes a function of outputting an operation command signal to the drive circuit to control an output voltage of the power conversion apparatus, a second function of setting, on the basis a current flowing through the switching element, a switching speed of the switching element to such a value that noise exceeding a withstand voltage between a conduction control terminal and an output terminal of the switching element can be prevented from occurring when the switching element is switched, and a third function of adjusting the drive circuit to drive the switching element such that the switching element is switched at the switching speed set by the second function.09-24-2009
20090237051DC-DC BOOST CONVERTER - A DC-DC boost converter is provided that generally maintains discontinuous mode operation in a generally efficient manner. To accomplish this, a clamp generator, comparator, logic gates, a flip-flop, and counter are employed. These components generally operate together to determine if an over-limit condition has taken place, so that the ON time of the boost converters' switch can be varied accordingly.09-24-2009
20090237050Switching power supply - A switching power supply, which operates intermittently under a light load for suppressing electric power consumption, reduces output voltage variations caused when a load current increases rapidly from a light load state, and reduces output voltage ringing. The switching power supply includes a comparator that compares a feedback signal obtained by isolating the output from an error amplifier with a burst threshold value and a comparator that compares the feedback signal with a power-supply-interruption threshold value preset to be lower than the burst threshold value. The switching power supply stops output of a driving pulse from a driver circuit when the feedback signal is lower than the burst threshold value. The switching power supply also stops the output of operation power from first power supply circuit when the feedback signal is lower than the power-supply-interruption threshold value.09-24-2009
20090237049COMPARATOR TYPE DC-DC CONVERTER - A comparator-system DC-DC converter 09-24-2009
20090237048Power management circuit and method of frequency compensation thereof - A power management circuit includes a regulator circuit, a first frequency compensation circuit, a first switch circuit and a detection circuit. The regulator circuit includes a signal output end. The first switch circuit is turned on in response to an enabled first control signal such that the first frequency compensation circuit is coupled to the regulator circuit. The detection circuit determines whether an output capacitor is coupled to the signal output end, and generates the enabled first control signal to turn on the first switch circuit and connect the first frequency compensation circuit to the regulator circuit when the output capacitor is not coupled to the signal output end. Therefore, the regulator circuit is frequency compensated by the first frequency compensation circuit.09-24-2009
20090237047SWITCHING POWER SOURCE - (Problem) To provide a switching power source having a stable negative voltage output.09-24-2009
20090033300Output control device, and AC/DC power source device, circuit device, LED backlight circuit device, and switching DC/DC converter device each using output control device - In one embodiment of the present invention, an output control device is disclosed capable of reducing a chip size and realizing a low cost. An output control device includes a switching transistor controlling an output voltage by having an on/off time ratio controlled and a control IC controlling the on/off time ratio of the switching transistor on the basis of the output voltage controlled by the switching transistor. The switching transistor is made of a lateral power MOSFET.02-05-2009
20090206812POWER SWITCHING CIRCUIT IMPROVED TO REDUCE LOSS DUE TO REVERSE RECOVERY CURRENT - In a power switching circuit, a second commutation member has a second commutation path electrically connected in parallel to a first commutation path and a second diode provided in the second commutation path and electrically connected antiparallel to a semiconductor switching element. While the semiconductor switching element is off, the second commutation path allows a second current based on the inductive load to flow therethrough in a forward direction of the second diode within a commutation period. The second diode has a second reverse recovery time shorter than a first reverse recovery time of the first diode. A second inductance of the second commutation path is higher than a first inductance of the first commutation path.08-20-2009
20090256540LOW DROP-OUT REGULATOR PROVIDING CONSTANT CURRENT AND MAXIMUM VOLTAGE LIMIT - A low drop-out regulator according to the present invention comprises an unregulated DC input terminal receiving an input voltage. A pass circuit is coupled between the unregulated DC input terminal and a regulated DC output terminal for supplying a power to the regulated DC output terminal. An amplifying circuit controls the pass circuit for providing a constant voltage or/and a constant current in response to an output voltage or/and an output current.10-15-2009
20090273325CURRENT NEGATIVE-FEEDBACK CIRCUIT AND DC-DC CONVERTER USING THE CIRCUIT - A current negative-feedback circuit comprises a current detection unit and a sawtooth-shaped waveform generation unit. The current detection unit comprises a first P-ch MOSFET Q11-05-2009
20100066324METHOD OF DIGITAL CONTROL OF PWM CONVERTERS ACHIEVING FAST TRANSIENT REPONSE AND LOW STEADY-STATE JITTERING - A pulse width modulator (PWM) control system for a power converter achieves a fast transient response and low steady-state jittering. The control system manages the ADC sample timing to reduce noise susceptibility, and the ADC includes a regulation bin or dead band to minimize large phase corrections and thus eliminate limit cycling. The PWM module includes a dithering circuit to accumulate fractional PWM control signals to reduce period jitter by increasing the effective resolution of the pulse width modulator.03-18-2010
20090009148STEADY STATE FREQUENCY CONTROL OF VARIABLE FREQUENCY SWITCHING REGULATORS - A steady state frequency control circuit for a variable frequency regulator including an open loop frequency control circuit, a frequency detector and a comparator circuit. The variable frequency regulator provides a clock signal indicating actual operating frequency and has a frequency control parameter for adjusting steady state operating frequency. The frequency detector receives the clock signal and provides a frequency sense signal which is compared with a steady state frequency reference signal to provide a frequency adjust signal. The frequency control parameter is adjusted by the frequency adjust signal to control steady state frequency. A method of controlling steady state frequency of a variable frequency regulator includes using open loop frequency control, determining the operating frequency and providing a frequency sense signal, comparing the frequency sense signal with frequency reference signal and providing a frequency adjust signal, and adjusting the frequency control parameter based on the frequency adjust signal.01-08-2009
20100072962DC/DC SWITCHED-MODE CONVERTER WITH A PERIOD BIFURCATION CONTROL MECHANISM - A DC-DC switched mode converter includes a voltage conversion circuit, a switch control circuit, a duty cycle detector, a control signal generator, and a control signal selector. The switch control circuit generates a first control signal. The duty cycle detector detects a duty cycle of the first control signal so as to generate a detection signal. The control signal generator generates a second control signal. The control signal selector outputs the first control signal or the second control signal for controlling the voltage conversion circuit according to the detection signal.03-25-2010
20110018512SWITCHING POWER SUPPLY DEVICE - Provided is a switching power supply device that can limit the generation of recovery current of diodes connected in parallel between the two ends of a synchronized rectifying element by the addition of a simple circuit, and that improves efficiency and facilitates miniaturization. The device comprises a synchronized rectifying element (SR01-27-2011
20120235658POWER REDUCTION OF A POWER SUPPLY UNIT AT LIGHT LOADING OR NO LOADING - A power supply unit includes a switching power converter responsive to a control signal to switch a power switch thereof to provide an output voltage and an output current for a load. To reduce light-load or no-load power consumption of the power supply unit, the power supply unit repeats a process of stopping switching the power switch and recovering switching the power switch for a period of time once the output voltage decreases to be lower than a reference voltage.09-20-2012
20120235660SWITCHING POWER SOURCE APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus includes a converting unit to convert a voltage level of power; a first switch to switch power supplied to the converting unit; a second switch connected in series with the first switch and turned on after the first switch has been turned on; and a voltage clamp unit to clamp a level of a voltage applied across the series connection of the first switch and the second switch to a predetermined voltage or less.09-20-2012
20120235659CONTROL CIRCUIT FOR SWITCHING VOLTAGE REGULATOR - A control circuit for a switching voltage regulator is disclosed, having a charging circuit, a discharging circuit, and a charging-discharging control circuit. The charging circuit generates a charging current according to the input voltage and the output voltage of the switching voltage regulator for charging a capacitor. The discharging circuit generates a discharging current according to the output voltage of the switching voltage regulator for discharging the capacitor. The charging-discharging control circuit configures the charging circuit, the discharging circuit, and the switching voltage regulator according to the voltage of the capacitor for providing a control signal to configure the switching voltage regulator.09-20-2012
20120235657SOFT-START CIRCUIT - Provided is a soft-start circuit which is capable of reducing the current consumption after the output of a switching power supply apparatus having been raised. It comprises a soft-start generation unit 09-20-2012
20120235656CURRENT-DIRECTION DETECTING CIRCUIT AND DC-DC CONVERTER - According to one embodiment, a circuit includes an amplifier, first and second capacitors, a switch and a monitoring-comparator. The amplifier amplifies source and drain voltages to output first and second amplified-signals. The first and second capacitors are connected to the amplifier's first and second terminals. The first and second amplified-signals are outputted from the first and second terminals. The switch forms first and second loops when a switching-transistor is OFF. The switch supplies a common-reference-voltage to the first and second loops to store charge in the first and second capacitors. The switch ends the first and second loops based on a gate-signal when the switching-transistor is ON. The monitoring-comparator compares first and second inputs. The monitoring-comparator outputs a signal depending on a comparison result when the switching-transistor is ON. The first and second inputs are input through the first and second capacitors.09-20-2012
20120235655VOLTAGE CONTROLLING CIRCUIT - A voltage controlling circuit with power sharing components is provided. The circuit includes a voltage regulator for controlling an output voltage for a load and a device in communication with the voltage regulator for power sharing.09-20-2012
20090256539Circuits and Methods for Sensing Current - Embodiments of the present invention include techniques for sensing current. In one embodiment, a switch in a switching regulator is coupled to a power supply. Input current from the supply is translated into an output current of the switching regulator. A signal corresponding to the output current is generated. The signal is selectively turned off with the input switch is open. Accordingly, the signal tracks the input current into the regulator. The signal may be used to determine the input current. In one embodiment, the signal is a voltage signal generated by a current corresponding to the output current provided into a resistor.10-15-2009
20110031948DC-DC CONVERTER - A DC-DC converter including a Pulse Width Modulation (PWM) controller for converting an input voltage into an output voltage is provided. The PWM controller includes an error amplifier, a comparator, a PWM generator and a ramp generator. The error amplifier generates an error signal according to a difference between a reference voltage and the output voltage. The comparator compares the error signal with a ramp signal to generate a trigger signal. The PWM generator generates a PWM signal with a fixed turn-on time, wherein a frequency of the PWM signal is adjusted according to the trigger signal, the input and output voltages. The ramp generator generates the ramp signal according to the PWM signal, the input voltage and the output voltage.02-10-2011
20100109628Clock control circuit and voltage pumping device using the same - A clock control circuit is provided. The clock control circuit includes a voltage supplier for supplying a first voltage in response to a first clock signal, a voltage booster for boosting the first voltage in response to the first clock signal input to the voltage booster, and a clock generator for generating a second clock signal having a voltage level equal to the boosted first voltage in response to the first clock signal.05-06-2010
20100244795Current Source to Drive a Light Source in an Optical Sensor System - A current source circuit to drive a light source in an optical sensor system is disclosed. The current source includes an inductor connected in series with a resistor, and a diode coupled in parallel with the inductor and resistor. The current source is configured to receive a regulated direct current (DC) voltage and to provide the current through the inductor to the light source when a switch is closed, and to divert current through the inductor to the diode when the switch is open.09-30-2010
20100327830LOW VOLTAGE DROP OUT REGULATOR - A low voltage drop out (LDO) regulator is disclosed. The LDO regulator has a voltage buffer for receiving an input voltage containing a DC component and an AC component, converting the input voltage into a converted voltage having a lower DC component and an AC component following that of the input voltage; a control stage applied with the converted voltage; and an output stage applied with the input voltage. The output stage is controlled by the control stage to output an output voltage of a specific level. In the LDO regulator, elements of small sizes can be used to save a layout area thereof. In the meanwhile, the LDO regulator can maintain a high power supply rejection ratio (PSRR) characteristic.12-30-2010
20120112719RECTIFIER CIRCUIT - A rectifier circuit includes: a switching circuit having an input end, an output terminal and a control end, wherein the input end of the switching circuit receives an input voltage; a control circuit electrically connected to the control end of the switching circuit, wherein, when a load current is smaller than a reference current, the rectifier circuit is situated at a light-load state and the control circuit reduces a switching frequency of the switching circuit; and a filtering circuit which is electrically connected between the output end of the switching circuit and an output terminal of the rectifier circuit, and includes at least one inductive component of which a current is formed by superposition of the load current and a ripple current, wherein, when the load current is smaller than the reference current, an inductance of the inductive component increases with the decrease of the load current.05-10-2012
20110279103POWER CONVERTER AND PULSE WIDTH MODULATION SIGNAL CONTROLLING APPARATUS THEREOF - A pulse width modulation signal controlling apparatus including a signal pin, a core circuit, a setting judging circuit, a signal adjusting and selecting circuit, and a timer circuit is disclosed. The signal pin is connected to a setting device for receiving an external input signal. The setting judging circuit receives and compares a setting signal with a reference value to generate a setting judgment result. The signal adjusting and selecting circuit couples the signal pin to the setting judging circuit and adjusts the external input signal into the setting signal according to the setting device in a first state, and couples the signal pin to the core circuit in a second state. The timer circuit controls the state of the signal adjusting and selecting circuit, wherein the timer circuit sets the signal adjusting and selecting circuit in the first state during a predetermined time period.11-17-2011
20090309562POWER REGULATOR - A power regulator for converting an input voltage to an output voltage includes a pass device, a reference signal circuit and an error amplifier. The pass device receives the input voltage and provides the output voltage at an output terminal of the power regulator. The reference signal circuit coupled to the output terminal is powered by the output voltage to provide a reference signal. The error amplifier coupled to the pass device is powered by the output voltage to compare the reference signal with a feedback signal indicative of the output voltage. The error amplifier can generate a control signal according to a result of the comparison to drive the pass device.12-17-2009
20090102443H-bridge pulse generator - A new type of circuit for driving an electromagnetic acoustic transducer (EMAT) which does not employ push-pull technology using a transformer but instant uses a novel circuit employing a series of Mosfet switches to correct all the disadvantages of using a transformer.04-23-2009
20100045250METHOD FOR DETECTING OUTPUT SHORT CIRCUIT IN SWITCHING REGULATOR - A method and circuit for accurately detecting an output short circuit in a switching regulator. A first transistor and a second transistor are connected in series and driven in a complementary manner. A comparator compares output current, which is generated when the first and second transistors are driven, with a short circuit detection threshold to generate a first short circuit detection signal. A timing controller retrieves the first short circuit detection signal generated by the comparator at a predetermined time to generate a second short circuit detection signal.02-25-2010
20090128111REVERSE CURRENT PROTECTION APPARATUS FOR A SYNCHRONOUS SWITCHING VOLTAGE CONVERTER - A synchronous switching voltage converter that avoids a reverse current is provided. The synchronous switching voltage converter comprises a first switch, a second switch, an inductor, a current sensing unit, and a current comparing unit. A first current flows through the inductor. The current sensing unit provides a second current which is proportional to the first current. The current comparing unit judges whether the first current is equal to zero at time x by comparing A*I05-21-2009
20120286750SWITCHING REGULATORS WITH ADAPTIVE CLOCK GENERATORS AND ASSOCIATED METHODS OF CONTROL - Various embodiments of switch mode power supplies, circuits, and methods of control are described herein. In one embodiment, a method of operating a switch mode power supply having a switching circuit coupled to an inductor includes modulating a duty cycle of the switching circuit to charge the inductor using pulse width modulation, supplying an output voltage from the inductor to the load, performing a comparison between the output voltage and a reference voltage, and deriving an error signal based on the comparison between the output voltage and the reference voltage. The method also includes generating a clock signal for the pulse width modulation based on the received error signal.11-15-2012
20120286753CURRENT BALANCING CIRCUIT AND METHOD - The present invention provides a current balancing circuit and method for balancing the respective currents in a plurality of parallel circuit branches in a target circuit. The current balancing circuit including: a plurality of balancing transistors, each having a collector, an emitter, and a base, the collector and emitter of each balancing transistor connected in series with a respective circuit branch; and a selection circuit for selectively connecting the circuit branch having the smallest current amongst the circuit branches to the bases of each balancing transistor.11-15-2012
20120286752SWITCHING REGULATOR CONTROL CIRCUIT, SWITCHING REGULATOR, ELECTRONIC APPLIANCE, SWITCHING POWER SUPPLY DEVICE, AND TELEVISION RECEIVER - A high-side variable current source and a high-side transistor are provided in series between a supply power terminal of a control circuit and a gate of a switching transistor. A low-side variable current source and a low-side transistor are provided in series between the gate of the switching transistor and a ground terminal. A slew rate controller controls the current value of at least one of the high-side and low-side variable current sources according to the state of a setting terminal. A switching power supply device has a plurality of output transistors connected in parallel with one another and a controller that generates control signals turning on and off the output transistors at a predetermined frequency so as to generate a desired output voltage from an input voltage and supply the output voltage to a load. The controller determines which output transistor to drive according to the magnitude of the load.11-15-2012
20090039849ULTRA LOW DROPOUT VOLTAGE REGULATOR - An ultra low dropout voltage regulator, which separately supplies operating power for internal circuits, but controls the operating power to perform the operation of a voltage regulator chip, so that an ultra low dropout voltage regulator can be designed to reduce standby power consumption and to minimize the size of the chip, can be designed to more rapidly respond to the overload or overvoltage of the chip and to stably and precisely shut down the chip in the event of the overload or overvoltage, and can be designed to realize ultra low dropout characteristics even at a low output voltage.02-12-2009
20090033299STEP-DOWN TYPE SWITCHING REGULATOR, CONTROL CIRCUIT THEREOF, AND ELECTRONIC DEVICE USING THE SAME - A pulse signal generating circuit generates a pulse signal having a duty ratio controlled such that the output voltage approaches a reference voltage. A driver circuit generates first and second gate voltages, which are to be respectively applied to the gates of a switching transistor and a synchronous rectifier transistor, based upon the pulse signal. A threshold voltage generating unit generates a threshold voltage which is synchronous with the second gate voltage, and which is in the high-level state during a period when the synchronous rectifier transistor is to be turned off and in the low-level state during a period when the synchronous rectifier transistor is to be turned on. A light-load detection comparator compares a switching voltage with the threshold voltage, and outputs a light-load detection signal.02-05-2009
20090295351Voltage Clamp Circuit, A Switching Power Supply Device, A Semiconductor Integrated Circuit Device, and A Voltage Level Conversion Circuit - The present invention provides a voltage clamping circuit which is operated in a stable manner with the simple constitution and a switching power source device which enables a high-speed operation. In a switching power source device, one of source/drain routes is connected to an input terminal to which an input voltage is supplied, a predetermined voltage to be restricted is supplied to a gate, and using a MOSFET which provides a current source between another source/drain route and a ground potential of the circuit, a clamp output voltage which corresponds to the input voltage is obtained from another source/drain route. The switching power source device further includes a first switching element which controls a current which is made to flow in an inductor such that the output voltage assumes a predetermined voltage and a second switching element which clamps an reverse electromotive voltage generated in the inductor when the first switching element is turned off to a predetermined potential. In such a switching power source device, the voltage clamping circuit is used in a feedback route for setting a dead time.12-03-2009
20110127982VOLTAGE CLAMP CIRCUIT, A SWITCHING POWER SUPPLY DEVICE, A SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE, AND A VOLTAGE LEVEL CONVERSION CIRCUIT - The present invention provides a voltage clamping circuit which is operated in a stable manner with the simple constitution and a switching power source device which enables a high-speed operation. In a switching power source device, one of source/drain routes is connected to an input terminal to which an input voltage is supplied, a predetermined voltage to be restricted is supplied to a gate, and using a MOSFET which provides a current source between another source/drain route and a ground potential of the circuit, a clamp output voltage which corresponds to the input voltage is obtained from another source/drain route. The switching power source device further includes a first switching element which controls a current which is made to flow in an inductor such that the output voltage assumes a predetermined voltage and a second switching element which clamps an reverse electromotive voltage generated in the inductor when the first switching element is turned off to a predetermined potential. In such a switching power source device, the voltage clamping circuit is used in a feedback route for setting a dead time.06-02-2011
20100171479BUCK DC-TO-DC CONVERTER AND METHOD - A method and apparatus for converting a DC voltage to a lower DC voltage, provides for conducting current from an input terminal, through an inductor to charge a capacitor connected to the inductor at an output terminal and to provide a varying range of load current from the output terminal, alternately switching the input terminal between a supply voltage and a ground potential to produce a desired voltage at the output terminal that is lower than the supply voltage, while providing the varying range of load current, and disconnecting the input terminal from both the supply voltage and the ground potential to reduce an increase in voltage at the output terminal caused by a substantial reduction in the load current, while current through the inductor adjusts in response to the reduced load current.07-08-2010
20100171477Power supply device and electronic apparatus - A power supply device includes a first supply section that supplies power according to an extent of a collective load of processing in a processing apparatus for the whole of the processing apparatus which processes data, and further includes a second supply section that supplies, at a place on a supply path through which power is supplied from the first supply section to the processing apparatus, power according to an extent of a load of processing in local in a portion of the processing apparatus to the portion, and supplies power smaller than supplying power of the first supply section.07-08-2010
20100171478CLOSED-LOOP DIGITAL CONTROL SYSTEM FOR A DC/DC CONVERTER - A control system comprises a DC/DC converter that includes first and second inductances, that receives a first DC voltage and that generates a second DC voltage. A control module selectively charges or discharges the first inductance while discharging or charging the second inductance during a first mode and one of charges both of the first and second inductances or discharges both of the first and second inductances during a second mode.07-08-2010
20100171476EXTENDING INPUT TO OUTPUT VOLTAGE RANGE IN MULTIPLE CHANNEL SWITCHING REGULATOR APPLICATIONS - Novel circuitry and methodology for operating a multiple channel switching regulator system to extend an input to output voltage ratio by setting individual constant switching frequencies to switching regulator channels. In the switching regulator system having at least first and second switching regulators, a first clock circuit supplies a first clock signal at a first clock frequency to define a switching frequency of one of the first and second switching regulators. A second clock circuit is synchronized to the first clock signal for producing a second clock signal at a second clock frequency different from the first clock frequency, to define a switching frequency of the other of the first and second switching regulators.07-08-2010
20100171475SWITCHING MODE CONVERTERS - A switch mode converter is configured to convert an input DC voltage applied at one level at the converter input to an output DC voltage at a second level at the converter output. The converter comprises: a switch configured to switch the input DC voltage on and off during each cycle of a plurality of cycles; energy storage configured to temporarily store energy from the input source voltage when the switch is on, and release energy when the switch is off during each cycle, wherein the input energy stored is equal to the energy released with each cycle and achieves equilibrium when the converter is operating into normal loads; and a reset mechanism configured to provide additional reset voltage during each cycle to achieve equilibrium when the converter is operating in a fault condition.07-08-2010
20100277148CAPLESS LOW DROP-OUT VOLTAGE REGULATOR WITH FAST OVERVOLTAGE RESPONSE - A voltage regulator is provided having one or more discharger circuits that compensate for low on-chip output capacitance and a slow loop response time. In one embodiment, the voltage regulator includes an output transistor coupled to an output voltage line, an output voltage sensing arrangement coupled to the output voltage line for producing an output feedback voltage, and an error amplifier coupled to the output feedback voltage, the output transistor, and a reference voltage for applying feedback control to the output transistor. A first discharger circuit is coupled to the output voltage line and to a reference potential, the first discharger circuit being triggered by a steep-rise overvoltage condition. In another embodiment, a combination of fast and slow discharger circuits is used to improve the load step response—i.e., to stop the output voltage from jumping too high and to pull it back to stable value very quickly, such that the load circuits are protected.11-04-2010
20090309563REFERENCE VOLTAGE GENERATING CIRCUIT AND DC-DC CONVERTER INCLUDING THE SAME - A reference voltage generator includes a reference voltage generating circuit that outputs a second reference voltage; and a DA converter that DA-converts a digital signal from outside in accordance with the second reference voltage. The circuit includes a first constant voltage circuit that operates on a DC voltage and outputs a first constant voltage; a second voltage divider that divides the first constant voltage at a second dividing ratio and outputs a second partial voltage; an output transistor that operates on the DC voltage and allows current to flow therethrough according to a signal applied to its control electrode; a current-voltage converter that converts the current from the output transistor into a voltage and outputs the voltage (second reference voltage); and a second op-amplifier that operates on the first constant voltage and controls the output transistor so that the second reference voltage equals to the second partial voltage.12-17-2009
20110279102CONTROL CIRCUIT OF CHARGE PUMP CIRCUIT - A control circuit of a charge pump circuit is disclosed, which includes a ring oscillator and a load status detection unit. The ring oscillator herein is for producing a clock signal and adjusting the frequency of the clock signal according to a first control signal, and stopping generating the clock signal according to an adjustment signal. The load status detection unit is for producing the first control signal and determining a time point to enable the first control signal according to the voltage drop variation of an output voltage of the charge pump circuit and the adjustment signal, wherein the pulse width of the adjustment signal gets narrower with a smaller drop amplitude of the output voltage value.11-17-2011
20090206813POWER SUPPLY CIRCUIT - A power supply circuit includes a first voltage regulator, a second voltage regulator, and a voltage comparator. The first voltage regulator is connected to a direct current power supply, and regulates a direct current supply voltage down to a first voltage level to output a first voltage at a first output terminal. The second voltage regulator is connected to the first voltage regulator, and regulates the first output voltage down to a constant, second voltage level to output a second voltage at a second output terminal. The voltage comparator is connected to the first and second voltage regulators, compares the first output voltage against a given threshold level greater than the second voltage level, and deactivates the second voltage regulator until the first output voltage exceeds the given threshold level upon startup of the power supply circuit.08-20-2009
20090206808Method for Generating an Internal Compensation Network of a Pole and Two Zeros to Compensate High Frequency Voltage Mode Switching Regulators - A method for controlling a switching voltage regulator that includes generating a feedback voltage that is proportional to the output voltage of the voltage regulator; generating a voltage proportional to the duty-cycle of the inductor charging and discharging phases as a function of the difference between the feedback voltage and a reference voltage; and adding a dominate pole and two zeros to the function used to generate the voltage proportional to the duty-cycle of the inductor charging and discharging phases.08-20-2009
20110285369Three-switch step-down converter - A three-switch step-down converter provides efficiency, size, cost and other performance advantages over the conventional two-switch buck converter and other step-down converters, over the entire duty ratio operating range.11-24-2011
20110101945MULTI-CHANNEL LOW VOLTAGE MICRO-ELECTRIC-FIELD GENERATOR - A biologic and medical multi-channel low voltage micro-electric-field generator including a power supply unit, at least one micro-electric-field generating unit set comprising a step-down unit, a linear regulator unit, and a pulse generating and outputting unit, and a programmable logic control unit. The micro-electric-field generating unit set is connected to an output end of the power supply unit. The step-down unit depresses the voltage of frequency power. The linear regulator unit regulates the output of the step-down unit. The pulse generating and outputting unit turns on/off the output of the linear regulator unit and connects to a network electrode group. The programmable logic control unit controls the characteristics of the output pulse from the pulse generating and outputting unit. The generator is applicable in gene, protein, drug and/or a variety of plasmids delivery to the organs, cells within the tissues of large animal or human.05-05-2011
20110285367SYSTEMS, METHODS, AND APPARATUS FOR CONTROLLING BI-DIRECTIONAL SERVO ACTUATOR USING AN H-BRIDGE WITH HYSTERESIS CONTROL - Certain embodiments of the invention may include systems, methods, and apparatus for controlling bi-directional drive current through an actuator. The method may include receiving a direction control signal, manipulating one or more devices to establish at least one switchable positive current path and at least one switchable negative current path through an actuator based at least in part on the direction control signal, providing feedback based at least on current associated with the actuator, and controlling the current based at least in part on the feedback. Certain embodiments of the method may include manipulating one or more devices to establish at least one positive current path and at least one negative current path through an actuator via hysteresis control.11-24-2011
20110285368SYSTEMS, METHODS, AND APPARATUS FOR CONTROLLING BI-DIRECTIONAL SERVO ACTUATOR WITH PWM CONTROL - Certain embodiments of the invention may include systems, methods, and apparatus for controlling bi-directional drive current through an actuator. The method may include receiving a direction control signal, manipulating one or more devices to establish at least one switchable positive current path or at least one switchable negative current path through an actuator based at least in part on the direction control signal, providing feedback based at least on current associated with the actuator, and controlling the current based at least in part on the feedback. The method may include manipulating one or more devices to establish at least one positive current path and at least one negative current path through an actuator via pulse width modulation control.11-24-2011
20110285366ADAPTIVE TWO-STAGE VOLTAGE REGULATOR AND METHOD FOR TWO-STAGE VOLTAGE REGULATION - The present invention discloses an adaptive two-stage voltage regulator and a method for controlling the same. The adaptive two-stage voltage regulator includes: a voltage regulator for converting an input voltage (Vin) to a middle voltage (Vm), wherein Vin≦Vin_max; a linear regulator for converting the middle voltage to an output voltage (Vout); and a middle voltage controller for adjusting the middle voltage according to (1) an input voltage indicator and one of (2a) an output voltage indicator and (2b) a predetermined reference signal, such that when Vin≦Vout, Vm=Vout+ΔV and (Vout+ΔV)11-24-2011
20110298438SWITCHING REGULATOR AND METHOD FOR OPERATING THE SAME - A switching regulator includes a high side driver electrically coupled with a power line that is configured to provide a supply voltage. A low side driver is electrically coupled between the high side driver and ground. A regulator control circuit is electrically coupled with a gate of the high side driver and a gate of the low side driver. The regulator control circuit is configured to pre-charge a first node between the regulator control circuit and the gate of the high side driver to a first voltage level and to boost the first node to a second voltage level that is higher than the first voltage level to turn on the high side driver.12-08-2011
20110298434HIGH VOLTAGE SYNCHRONOUS RECTIFIER CONTROLLER - A power supply may comprise a pulse-width-modulation (PWM) controller; a synchronous rectifier having a forward metal oxide field effect transistor (MOSFET) and a catch MOSFET; a forward gate driver; a catch gate driver; and the PWM controller connected so that a low output of the PWM controller facilitates operation of the catch MOSFET and so that the low output precludes operation of the forward MOSFET. The power supply may include a self powered synchronous rectifier that may be constructed with delay times that are independent of lot-to-lot and temperature-related timing variations of MOSFETS.12-08-2011
20110298437Switching adapter control method for adaptive mobile power systems - A switching adapter control method for adaptive mobile power systems is composed of reference current generator, current mode error compensator, controllable constant turn-off timer, PWM generator and MOSFET driver. The output of the switching adapter can show constant current and voltage characteristics, that means, as the DC bus voltage is over a preset voltage, the adaptor's output characteristic is converted from a constant current source into a constant voltage source with the preset voltage. For low output capacitance case, the present invention has the ability to smoothly reduce the switching frequency of the switching adaptor and reduce the switching losses and meet Energy Star 2.0 requirements under different load conditions. And the output ripple current and voltage can be in the allowed range.12-08-2011
20110298435APPARATUS AND METHOD FOR VOLTAGE DISTRIBUTION - Apparatus and methods for providing regulated voltages are disclosed. Using a single voltage regulator, a plurality of regulated voltages can be generated with a voltage distribution function. These regulated voltages can be used in a variety of applications, for example, as a bias voltage for a power amplifier. In addition, the distributed regulated voltages can implement a variety of functions, such as selectively enabling or disabling power amplifiers.12-08-2011
20110298433SWITCHING POWER SUPPLY INDUCTOR ARRANGEMENT - A switching power supply circuit has a controller, a power switch, and an inductor circuit that is coupled to a power node of the power switch and to a capacitor. The inductor circuit has several discrete component conductors that are connected to each other in parallel and laid out side-by-side and wired such that each of the inductors is oriented with opposite polarity relative to another adjacent one of the inductors. Each inductor has associated first and second traces that are used to wire it to the power node and the capacitor. These traces for one inductor have matched characteristics with those of an adjacent inductor. Other embodiments are also described and claimed.12-08-2011
20110291627Voltage regulator - The invention relates to a voltage regulator having a differentiating circuit and an amplifier, the differentiating circuit being designed to detect a voltage at the voltage regulator connection and to provide it as a differentiated signal at its differentiating output, and the amplifier being designed to inject a compensation signal dependent on the differentiated signal into an input connection of an output circuit of the voltage regulator.12-01-2011
20110291629SWITCHING REGULATOR AND METHOD FOR ELIMINATING BEAT OSCILLATION - The present invention discloses a switching regulator eliminating beat oscillation, comprising: a first transistor, a second transistor, and an inductor connected to a common node, wherein the first and second transistors operate to convert an input voltage to an output voltage; a comparator comparing a voltage signal with a saw tooth wave to generate a control signal controlling at least one of the first and second transistors; a feedback loop obtaining a feedback signal from the output voltage and generating the voltage signal according to the feedback signal; and an inductorless filter circuit located in the feedback loop for filtering a predetermined frequency band.12-01-2011
20110291628SWITCHING REGULATOR CIRCUIT AND METHOD FOR PROVIDING A REGULATED VOLTAGE - A switching regulator circuit and a method for providing a regulated output voltage for a load is provided that includes a comparator, whose comparator output signal is routed to a first oscillator control input, whereby a first comparator input voltage is present at a first input of the comparator and a second comparator input voltage is present at a second comparator input of the comparator, an oscillator with the first oscillator control input, at which the comparator output signal of the comparator is present, and whereby an oscillator output signal can be provided at an output of the oscillator, and by means of the signal the switching processes at a switching element can be controlled, by which a coil current can be influenced by a coil connected to the switching element, and a first compensator for influencing the second comparator input voltage as a function of the input voltage, whereby this first compensator is connected to the second comparator input of the comparator.12-01-2011
20120098510INTEGRATED CIRCUIT COMPRISING VOLTAGE MODULATION CIRCUITRY AND METHOD THEREFOR - An integrated circuit comprising voltage modulation circuitry arranged to convert an input voltage level at an input node to an output voltage level at an output node. The voltage modulation circuitry comprises a switching element arranged to connect the input node to the output node when in an ON condition, and switching control module operably coupled to the switching element and arranged to control the connection of the input node to the output node by the switching element in accordance with a switching frequency. The voltage modulation circuitry further comprises frequency control module operably coupled to the switching control module and arranged to receive an indication of the input voltage level at the input node, and to configure the switching frequency based at least partly on the input voltage level indication.04-26-2012
20120098509MONOLITHIC DC/DC POWER MANAGEMENT MODULE WITH SURFACE FET - A monolithic DC to DC converter, provides a semiconductor substrate, a surface FET formed on the semiconductor substrate that modulates currents across a surface of the semiconductor substrate, and a toroidal inductor with a magnetic core formed on the substrate around the FET and having a first winding connected to the FET.04-26-2012
20110074375Gate Driver in Buck Converters - A circuit for driving a switching stage including control and sync switches series connected at a switching node, at least one of the control and sync switches being a normal ON depletion mode device, the circuit comprising a gate driver including first and second switching stages for generating gate drive signals for the sync and control switches, respectively, the first switching stage having a first driver output node and the second switching stage having a second driver output node, a signal from the first node driving the sync switch and a signal from the second node driving the control switch and a circuit connected to the first and second switching stages, the circuit including a first circuit providing a first voltage source, the first circuit being coupled to the first switching stage and to the sync switch, a first bias voltage from the first voltage source being switched by the first switching stage, the first switching stage having a first state wherein the sync switch is on, and a second state wherein the first bias voltage is switched to the gate of the sync switch to turn the sync switch off and a second circuit including a first energy storage device for charging with a second bias voltage, the second switching circuit having a first state, wherein the control switch is on when the sync switch is off and having a second state wherein the control switch is switched off when the sync switch is on by switching the second bias voltage to the gate of the control switch.03-31-2011
20110115455ENERGY PREDICTIVE BUCK CONVERTER - In a switched-mode buck power converter, superior regulation with excellent transient response is provided when per-cycle energy demand is determined and balanced with per-cycle inductive energy supply to control per-cycle inductive energy charging. Such per cycle inductive energy calculation is improved through the prediction of pedestal energy during operating periods of Continuous Conduction Mode (CCM). Further, recovery from severe transients sometimes straddles multiple chopping cycles. Such recovery is best obtained by preserving energy balance information from one or more un-recovered chopping cycles, to be used to restore energy balance in subsequent cycles. Significant improvement over prior art converters may be obtained even when the energy balance data used for control and recovery are imprecise approximations of true energy demand and supply.05-19-2011
20110285370DC-DC CONVERTER CIRCUIT - An embodiment of a voltage conversion unit is proposed. The voltage conversion unit comprises a switching DC-DC converter including an input terminal for receiving an input voltage from a source, a control terminal adapted to receive a pulse width modulated driving signal oscillating at a first frequency, and an output terminal for providing to a load an output voltage generated from the input voltage according to the driving signal. The voltage conversion unit further comprises a switching control unit configured to receive the output voltage and a reference voltage and to set a duty cycle of the driving signal based on a comparison between the output voltage and the reference voltage. The switching DC-DC converter and the switching control unit form a feedback loop having a loop gain defining a corresponding operating bandwidth of the voltage conversion unit. The load is configured to drain a current pulse train having a second frequency; the values of the first and second frequencies are such to cause the occurrence of beat oscillations at frequencies comprised within the operating bandwidth. The switching control unit comprises means for reducing the beat oscillations by increasing the loop gain at least for a frequency interval comprised within the operating bandwidth.11-24-2011
20100090667OUTPUT COMPENSATED VOLTAGE REGULATOR, AN IC INCLUDING THE SAME AND A METHOD OF PROVIDING A REGULATED VOLTAGE - A voltage regulator, a method of regulating voltage and an IC including a voltage regulator. In one embodiment, the voltage regulator includes: (1) a DC precision amplifier configured to generate a DC precision signal based on a reference voltage and a regulated output of the voltage regulator and (2) a response amplifier, coupled in parallel with the DC precision amplifier, configured to generate an error signal based on the reference voltage and the regulated output, the response amplifier further configured to generate the regulated output based on a regulating signal comprised of the error signal and the DC precision signal. The DC precision amplifier may be a CMOS amplifier and the response amplifier may be a NPN amplifier.04-15-2010
20100327835INTEGRATOR FOR PROVIDING OVERSHOOT PROTECTION AND LIGHT SWITCHING MODE DURING NON-ZERO LOAD CONDITION FOR AN LED DRIVER CIRCUITRY - A voltage regulator system comprises circuitry for generating a regulated output voltage responsive to an input voltage and switching control signals. A voltage divider is connected to an output node of the circuitry to provide a way to monitor the output voltage. A voltage regulator controller generates the switching control signals responsive to the monitored output voltage and a reference voltage. A compensation network is associated with the voltage regulator controller. The voltage regulator controller further controls the circuitry for regulating an output current pulse for the regulated output voltage responsive to an indication that the monitored output voltage is below a reference voltage in the no-load condition without interaction with the loop compensation network. The voltage regulator controller further selectively associates the compensation network with the voltage regulator controller responsive to a load condition and selectively disconnects the compensation network from the voltage regulator controller responsive to a no-load condition.12-30-2010
20100289469 START-UP DETECTION IN A DIMMER CIRCUIT - Disclosed is an inductive load detection circuit for detecting the presence of an inductive load on a dimmer circuit. The detection circuit provides for enhanced detection of the inductive load by detecting voltage ringing resulting from a turn-off of a switching element in the circuit. The ringing can be enhanced by providing a faster turn-off rate in an initial period than a turn-off rate in a steady state period.11-18-2010
20100102787CONTROLLED POWER SUPPLY AND METHOD FOR PULSE LOAD - A method for supplying bursts of substantially constant voltage to a switched load via a voltage reservoir. Based on a predetermined current that is to be sourced by the load during an active portion of a switching cycle, computing an average current that should be fed to the voltage reservoir during an inactive portion of the switching cycle to ensure that sufficient energy will stored in the voltage reservoir to supply the load without completely draining the voltage reservoir. Supplying continuous energy to the voltage reservoir at a substantially constant current equal in magnitude to said average current.04-29-2010
20120229110HIGH EFFICIENCY PFM CONTROL FOR BUCK-BOOST CONVERTER - A buck/boost voltage regulator generates a regulated output voltage responsive to an input voltage and a plurality of control signals. The buck/boost voltage regulator includes a plurality of switching transistors responsive to the plurality of control signals. Control circuitry monitors the regulated output voltage and generates the plurality of control signals responsive thereto. The control circuitry controls the operation of the plurality of switching transistors to enable a charging phase in a first mode of operation, a pass through phase in a second mode of operation and a discharge phase in a third mode of operation within the buck/boost voltage regulator to eliminate occurrence of a four switch switching condition.09-13-2012
20100264892Power supply control device and power supply control method - Control accuracy with regard to variation of output voltage is improved. A direct current converter unit (10-21-2010
20110006745METHOD FOR REGULATING AN OUTPUT VOLTAGE - A method for regulating the output voltage of a power supply. A boost PWM switching converter adjusts the gate drive signals to a switching transistor and a pass transistor so that the power supply has an operating frequency, Fs, based on a comparison between a parameter and a reference. The parameter may be a ratio of an input voltage to an output voltage, a difference between the output voltage and the input voltage, or the value of an input voltage. In accordance with the comparison between the parameter and the reference, the switching control circuit linearly decreases the operating frequency of the power supply. By changing the operating frequency, the output and input voltages of the power regulator may be almost equal to each other when operating with a control signal having a low duty cycle while maintaining a low output voltage ripple and a low inductor current ripple.01-13-2011
20100141226Switching power circuit and power supply method - A switching power circuit is provided with a power bypass circuit. The bypass circuit supplies a power supply voltage of an input terminal by bypassing a FET and a π-filter during a period after supply of the power supply voltage is started until the power supply voltage reaches a predetermined threshold level corresponding to a reference voltage. Even if start of the switching operation of the FET is delayed because of the operation of a soft start circuit, the power supply voltage supplied to a load through the switching power circuit is raised at earlier time.06-10-2010
20100066322DC/DC-CONVERTER - The present invention relates voltage conversion device in which a regulated output voltage is supplied by current pulses generated by the voltage conversion device from a voltage source. In particular, the invention relates to an improved control of an pulse frequency modulation (PFM) operation mode in which the frequency of the generated current pulses is modulated to regulated the desired output voltage, namely how PFM pulses can be generated without the need for a high-frequency clock of a time controlled system. By having pulse phases are current mode controlled and providing a mode detector to generate the right kind of current pulse, the high-frequency clock is no longer needed. Further, the presented solution allows for a higher PWM as well as PFM frequency, the external components of the converter can be made smaller. Eliminating the need for a high-frequency clock makes the device simpler, smaller and more energy-efficient.03-18-2010
20110215779Dynamic voltage scaling interface - A switcher system or circuit and corresponding methods provide dynamic voltage scaling. One embodiment of an apparatus includes: a switcher controller configured to monitor a signal from a processor for a first state, determine a time that the signal is in the first state, and provide an adjustment signal based on the time, and a power supply coupled to the adjustment signal and configured to provide a variable supply voltage to the processor core, the variable supply voltage controlled by the adjustment signal after the determining a time.09-08-2011
20110215780DE-GLITCH SWITCHING CONVERTING CIRCUIT AND CONTROLLER THEREOF - A de-glitch switching converting circuit and a controller thereof are provided. In the embodiment of the invention, the circuit can filter noises with high frequency by way of time judgment, so as to avoid the erroneous operation of the controller affecting the stability of the output voltage or the output current. Compared with the method of using low-pass filters with large capacitors to filter noises, highly increasing the cost of the circuit is unnecessary in the embodiment of the invention. The circuit in the embodiment of the invention also has the capability for filtering noises with high amplitudes. In addition, by setting suitable parameters, the circuit in the embodiment of the invention can also avoid affecting the transient response of the circuit while filtering noises.09-08-2011
20090027019Control loop for switching power converters - A control loop for a clocked switching power converter where the loop features a comparator (01-29-2009
20090189583SWITCHING POWER SUPPLY WITH SWITCHING CIRCUITS - A switching power supply has first and second switching units and a control unit. Each switching unit has a switching element performing a switching operation to intermittently receive electric current from a battery while accumulating electric power in a coil and discharging this power to an output terminal. A resistor earthed is serially connected with each switching element. The resistance of the first resistor receiving the first current from the first switching element is lower than that of the second resistor receiving the second current from the second switching element. A maximum value of the first current is higher than that of the second current due to the difference between the resistors. The control unit controls the switching operations of the elements to boost the voltage of the battery and stops the switching operations in response to the first current exceeding an upper value.07-30-2009
20090189582SWITCHING POWER SUPPLY DEVICE AND ELECTRICAL APPARATUS USING THE SAME - The present invention provides a switching power supply device capable of automatically restarting an electrical apparatus without a user operation when a voltage of the electrical apparatus or an operation of the electrical apparatus is abnormal. The switching power supply device is provided with a short-circuiting switch for a shunt regulator included in the feedback circuit. When an abnormal condition occurs in a secondary side circuit, the short-circuiting switch is turned on by means of a control signal to reduce a voltage of a primary side auxiliary winding and temporarily stop an operation of a primary side control circuit and of a switching element. A primary side capacitor continues to be charged by a power supply through a starting resistor. The primary side control circuit and the switching element automatically restart to operate.07-30-2009
20090189579SWITCH STATE CONTROLLER WITH A SENSE CURRENT GENERATED OPERATING VOLTAGE - A power supply system and method includes a switch state controller that is operational to control a switching power converter during certain power loss conditions that cause conventional switch state controllers to have diminished or no functionality. In at least one embodiment, during certain power loss conditions, such as when an auxiliary power supply is in standby mode or when the switching power converter is not operating, a power supply for the switch state controller does not provide sufficient operating power to the switch state controller during certain power loss conditions. In at least one embodiment, during such power loss conditions power is generated for the switch state controller using sense input and/or sense output currents of the switching power converter to allow an integrated circuit (IC) switch state controller to generate a control signal to control a switch of the switching power converter.07-30-2009
20090189581APPARATUS AND METHOD FOR RECYCLING THE ENERGY FROM LOAD CAPACITANCE - The present invention provides a voltage regulator/power converter capable of bidirectional power propagation, fitted with controls capable of raising and lowering voltages with unprecedented speed and accuracy. The bidirectional capability allows energy stored in capacitors to be returned to system power sources. In one embodiment of the invention power is supplied from a power source (on a first port of the power converter) to the load (on a second port of the power converter) through the converter and then, when load voltage is reduced or turned off, energy in the load capacitance is returned from to the power source. In an alternative embodiment energy from load capacitance is stored or used by a device on a third port of the power converter.07-30-2009
20120187931Power Supply Control Circuit and Power Supply Circuit - A power supply control circuit comprising: a first control circuit configured to control on/off of a transistor, whose input electrode is applied with an input voltage, based on a feedback voltage so that an output voltage at a target level is generated from the input voltage to be applied to a load, the feedback voltage being in accordance with a reference voltage and the output voltage; and a second control circuit configured to control a feedback voltage generation circuit so that the output voltage rises with increase in load current flowing through the load, the feedback voltage generation circuit configured to generate the feedback voltage.07-26-2012
20100079123OUTPUT-VOLTAGE CONTROL DEVICE, OUTPUT-VOLTAGE CONTROL METHOD, AND ELECTRONIC APPARATUS - An output-voltage control device includes a comparator which generates a comparison result after a given time passes from first timing of a first periodic signal, the comparison result being obtained by comparing a difference between an output voltage and a reference voltage with the first periodic signal, a first signal generator which generates a timing control signal which is at a first level before the given time passes from the first timing and which changes from the first level to a second level in a period in which the comparator outputs the comparison result after the given time passes, and a second signal generator which generates a control signal for controlling the output voltage in accordance with the comparison result and the timing control signal.04-01-2010
20090167269BI-DIRECTIONAL DC POWER CIRCUIT - Bi-directional direct current (DC) power circuit having: a signal processing module for processing feedbacks of output voltage and voltage drop, and outputting pulse control and directional control signals; a pulse width modulation (PWM) module for outputting pulse signals in response to the control signals from the signal processing module; and a switch rectifying module for switching on and off in response to the pulse signals from the PWM module. The pulse control signal from the signal processing module can be in response to an input current signal from a sense resistor. The circuit is capable of achieving both step-up and step-down voltage conversions.07-02-2009
20090315528INTERNAL SUPPLY VOLTAGE GENERATOR CAPABLE OF REDUCING LATCH-UP AND SEMICONDUCTOR DEVICE HAVING THE SAME - Provided are an internal supply voltage generator capable of reducing latch-up and a semiconductor device having the same. The internal supply voltage generator generates at least one internal supply voltage, and includes a first booster circuit that generates a first voltage from a first reference voltage and an input voltage and outputs the first voltage via a first output terminal, a second booster circuit that generates a third voltage from a second voltage and the first voltage and outputs the third voltage via a second output terminal, and at least one switch that is disposed to correspond to at least one of the first output terminal and the second output terminal and adjusts at least one of the first voltage and the third voltage.12-24-2009
20100283440POWER SUPPLY DEVICE, CONTROL CIRCUIT AND METHOD FOR CONTROLLING POWER SUPPLY DEVICE - A power supply device including a converter having a switch circuit to which an input voltage is supplied and a coil coupled between the switch circuit and an output end from which an output voltage is output; and a control circuit comparing between a feedback voltage and a reference voltage, and on/off controls the switch circuit according to a comparison result; wherein, the control circuit includes a current gradient detection circuit performs detection of a gradient of a coil current flows thorough the coil during an off period of the switch circuit and generates a slope voltage according to a result of the detection; and an adder circuit performs one of generating the feedback voltage by adding the slope voltage to a voltage according to the output voltage and generating the reference voltage by adding the slope voltage to a standard voltage that is set according to the output voltage.11-11-2010
20110267018AC COUPLED HYSTERETIC PWM CONTROLLER - This document discusses, among other things, an apparatus and method for a hysteretic controller for an inductor based power converter. The hysteretic controller can include a coupling circuit configured to provide feedback information to a hysteretic comparator, the feedback information including a DC component of a feedback voltage and an AC component of the signal indicative of current flow through the inductor, wherein the feedback voltage is a scaled representation of load voltage.11-03-2011
20110169470Power supply control circuit, power supply device, power supply system, and method of controlling power supply control device - A power supply control circuit detects a reference voltage VD corresponding to an intermediate voltage of a Hi Side FET and a Lo Side FET, when a short-circuit fault of the Lo Side FET is generated, and compares a threshold value VIN−VrefH and the reference voltage VD using a comparator COMP. The power supply control circuit determines that the short-circuit fault is generated, when the reference voltage VD is less than the threshold value VIN−VrefH and a switching control signal (HiDr) is in an ON state. Likewise, the power supply control circuit detects the reference voltage VD of the Hi Side FET and the Lo Side FET, when a short-circuit fault of the Hi Side FET is generated, and compares a threshold value VrefL and the reference voltage VD using the comparator COMP. The power supply control circuit determines that the short-circuit fault is generated, when the reference voltage VD is more than the threshold value VrefL and a switching control signal (LoDr) is in an ON state.07-14-2011
20110169469VARIABLE CURRENT LIMITER, A POWER SUPPLY AND A POINT OF LOAD CONVERTER EMPLOYING THE LIMITER AND A METHOD OF OPERATING A NON-ISOLATED VOLTAGE CONVERTER - A variable current limiter, a power supply and a method of operating a non-isolated voltage converter are disclosed herein. In one embodiment, the variable current limiter includes: (1) a converter controller configured to regulate an output voltage of a non-isolated voltage converter and limit an output current thereof and (2) a limit provider configured to provide a variable output current limit that inversely varies with the output voltage, the converter controller configured to employ the variable output current limit to limit the output current.07-14-2011
20090153113APPARATUS, METHOD AND SYSTEM FOR CONTROL OF AC/AC CONVERSION - A method, system and apparatus for controlling a pulse width modulator (PMW) converter for direct AC/AC conversion and/or AC voltage regulation. According to some embodiments of the invention, an output voltage may be provided, independent of the input voltage quality, thereby avoiding or minimizing power company irregularities, brownouts and the like. Embodiments of the present invention may be useful, for example, for use in connection with motors and motored devices or other applications.06-18-2009
20090153119METHOD AND DEVICE FOR MEASURING CURRENT FOR A DC-DC CONVERTER - An embodiment of a current sensing device for a DC-DC converter comprising an output node through which passes an output current and taken to an output potential equal respectively to first and second values. The current sensing device comprises an amplifying module comprising a retroaction node through which passes a mirror current that is proportional to the output current and taken to the potential present on a first input of the amplifying module. The device also comprises a first intermediate module mounted between the first potential and the output node, comprising an intermediate node connected to the first input and taken to an intermediate potential equal to third and fourth values respectively correlated to the first and second values, wherein the difference between the third and fourth values is smaller than the difference between the first and second values.06-18-2009
20090153118POWER SUPPLY CONTROLLER AND MECHANICAL APPARATUS USING THE SAME - There is a need for improving switching regulator characteristics and providing a stable power supply controller. The power supply controller uses a battery and either or both functions of stepping up and stepping down a battery voltage. The power supply controller includes a means that prevents a ripple voltage from occurring by stopping the up conversion function for a switching operation in connection with a battery during a predetermined period without changing conditions for a conventional switching device or smoothing circuit and fast stabilizes a primary voltage using only the down conversion function.06-18-2009
20090153115DC-DC converter drive circuit which has step up mode and step down mode - A switching signal for load power control undergoes a logic change on the basis of a reference power supply potential by a controller responding to a load power feed control sense signal, and a reference signal. The sense signal in a first operation mode is converted from a load power feed state feedback signal varying on the basis of an input power supply potential into a signal varying on the basis of the reference power supply potential to be fed to the controller. On the other hand, a load power feed state feedback signal varies on the basis of the reference power supply potential in a second operation mode, and the load power feed state feedback signal is used as the sense signal to be fed to the controller.06-18-2009
20090153114DC-DC converters with transient response control - A DC-DC converter used to convert an input voltage to an output voltage is disclosed. The DC-DC converter comprises a pulse-width-modulation (PWM) generator, a transient boost circuit, a logic circuit, a switching device, and a buck circuit. The pulse-width-modulation (PWM) generator generates a PWM signal according to the output voltage. The transient boost circuit generates an adjusting signal according to the variation of the output voltage. The logic circuit generates a switch signal according to the PWM signal and the adjusting signal. The switching signal is at a high level when the PWM signal or the adjusting signal is at the high level, and the switching signal is at a low level when the PWM signal and the adjusting signal are at the low level. The switching device converts the input voltage to a driving signal according to the switching signal. The buck circuit receives the driving signal to generate the output voltage.06-18-2009
20090153117LOAD CONTROLLER - A load controller includes: an input circuit which detects that a drive instruction signal is less or equal to a first input threshold value; a constant current source activated in accordance with a detection by the input circuit; a PWM signal generating unit that is activated by the constant current source and generates a PWM signal; a comparator that is activated by the constant current source and compares the drive instruction signal with a second input threshold value set to be lower than the first input threshold value; a logic calculation unit that carries out a logic calculation of the PWM signal with a compared result of the comparator; a drive control unit that operates in accordance with an output from the logic calculation unit to generate a PWM drive control signal; and a load driving element that is driven by the PWM drive control signal to control a load.06-18-2009
20090146626System And Method For Dissipating Energy On The Primary Side Of A Bi-Directional Switching Power Supply - A system for dissipating energy in a power supply includes a bidirectional switching power output stage coupled to a primary power supply side and a secondary power supply side, the bi-directional switching power output stage configured to provide a positive voltage and a positive current, the bi-directional switching power output stage also configured to provide a positive voltage and to receive a current. The system for dissipating energy in a power supply also includes a current sinking circuit coupled to the primary power supply side, the current sinking circuit configured to dissipate energy when the secondary power supply side of the switching power supply is receiving current.06-11-2009
20090146627VOLTAGE REGULATING CIRCUIT - A voltage regulating circuit including an error signal generator, a comparator, a switch unit, a low-pass filter and a modulating unit is provided. The error signal generator respectively receives a reference voltage signal and a feedback signal, and generates an error signal. The comparator respectively receives the error signal and a comparing signal, and generates a pulse width modulation signal. The switch unit regulates an input voltage signal to generate an output voltage signal according the pulse width modulation signal. The low-pass filter filters out the high frequency of the output signal and produces the feedback signal. The modulating unit is coupled to the low-pass filter and the error signal generator for regulating a transient voltage of the output voltage signal.06-11-2009
20090146629METHODS AND APPARATUS FOR POWER SUPPLY - Methods and apparatus for supplying a load according to various aspects of the present invention operate in conjunction with an output stage and a control system driving the output stage. The control system may include a PWM controller adapted to provide a drive signal to the output stage and an over-current protection circuit. The over-current protection circuit may sense an over-current condition at the load and truncate the drive signal in response to the over-current condition.06-11-2009
20090146628POWER SUPPLY CONTROL CIRCUIT - An exemplary aspect of a power supply control circuit includes a reference voltage control circuit that applies a potential corresponding to a potential of a second power supply line to a reference voltage node connected to a control terminal of a first switch when a power supply voltage is applied in a forward direction between first and second power supply lines, and that applies a potential corresponding to a potential of a first power supply line to the reference voltage node when the power supply voltage is applied in the reverse direction between the first and second power supply lines.06-11-2009
20090015223POWER SUPPLY VOLTAGE BOOSTER - A power supply voltage booster avoids inadequate step-up capability. In a voltage boosting circuit, a switching device connects and disconnects between the ground potential and one end of the coil, the other end of which is supplied with a supply voltage VB. The switching device is repeatedly turned ON and OFF such that the capacitor is electrically charged from the force in the coil when the switching device is turned off. A charging control circuit turns off the switching device when current flowing through the switching device into the coil is determined to have increased to a switch-off threshold value when the switching device is ON, and turns on the switching device upon determining that the charging current flowing to the capacitor from the coil decreases to a switch-on threshold value when the switching device is OFF. The charging control circuit sets the switch-off threshold value to a larger value as the supply voltage VB is lower. Thus, inadequacy of the step-up capability caused by a drop in the supply voltage VB can be avoided.01-15-2009
20090085541Semiconductor Device, Method for Fabricating the Same, and Transformer Circuit Using the Same - A semiconductor device, a method for fabricating the same, and a transformer circuit using the same are disclosed. The semiconductor device includes a trench metal oxide semiconductor (MOS) transistor for switching a load of current supplied from a power source, and a boost controller for controlling driving of the trench MOS transistor, the boost controller being formed with the trench MOS transistor on a single semiconductor device to form an integrated structure. In this structure, the physical space of the semiconductor device is reduced, thereby reducing the size of a DC-DC transformer circuit using the semiconductor device. It is possible to obtain finely-adjusted output values by controlling values of the ripple current and ripple voltage. A desired operational stability according to a variation in temperature can also be secured.04-02-2009
20080290849VOLTAGE REGULATION SYSTEM - A voltage regulation system is provided including detecting a feedback voltage less than a reference voltage; asserting a current source gate output by the feedback voltage less than the reference voltage; activating a gated current source by the current source gate output; and waiting a delay interval before negating the current source gate output for turning off the gated current source.11-27-2008
20080278131Switching mode power supply and driving method thereof - A switching mode power supply includes: a power supply unit that comprises a switch that is coupled to a primary coil at a primary side of a transformer for converting an input DC voltage, and that supplies power to a secondary coil and a tertiary coil at a secondary side of the transformer according to an operation of the switch; a switching controller that receives a feedback voltage corresponding to a first voltage generated in the secondary coil at the secondary side of the transformer, and receives a detection signal corresponding to a current flowing to the switch to control an on/off operation of the switch; and a feedback signal generator that receives the first voltage and the switching control signal, samples the first voltage by using first pulse strings, and generates the feedback voltage according to a level of the first voltage sampled by a first pulse in the first pulse strings, wherein a toggling time of the first pulse strings is changed in a first period for sampling the first voltage, and a time for sampling the first voltage is changed.11-13-2008
20100277149CONTROLLER OF POWER CONVERTER - A controller that controls a switching element of an inverter using pulse width modulation is applied to a power converter including an inverter, to realize a stable change of a carrier frequency, current control responsiveness, and inverter loss suppression. The controller includes a carrier-frequency setting unit that sets a carrier frequency command used for pulse width modulation of an inverter corresponding to a current command and a current-command change rate. The carrier-frequency setting unit includes a carrier frequency map having mapped thereon information of a carrier frequency corresponding to a current command expressed in a vertical axis and a current-command change rate expressed in a lateral axis, and outputs information of a carrier frequency on the carrier frequency map corresponding to the input current command and the input current-command change rate to a switching pattern calculator.11-04-2010
20100123443Hybrid power converter - Power converter circuits, structures, and methods are disclosed herein. In one embodiment, a hybrid converter can include: (i) a first switching device controllable by a control signal; (ii) an inductor coupled to the first switching device and an output; and (iii) a control circuit configured to receive feedback from the output for generation of the control signal to control the first switching device, where the control circuit includes a first detection circuit configured to detect first and second output conditions, the control circuit being configured to operate the first switching device in a switch control in response to the control signal when the first output condition is detected, and to operate the first switching device in a linear control region when the second output condition is detected.05-20-2010
20090309565BOOST CIRCUIT AND POWER SUPPLY DEVICE - The objective of this invention is to provide a boost circuit that reduces power consumption and prevents malfunctioning when the input voltage becomes greater than a target voltage for the output voltage. Control circuit module 12-17-2009
20090309561DUAL MODE TRANSIENT RECOVERY CONTROL METHOD OF DC-DC CONVERTERS - A dual mode transient recovery control method and system is proposed, which is designed for use with a direct-current (DC) power output unit, such as a DC-DC converter, for fast transient recovery of DC output power by switching the DC-DC converter to operate between a hysteretic mode and a PWM (Pulse Width Modulation) mode. The proposed control method and system is characterized by the use of a dual-threshold scheme to compare the output voltage. This feature may discharge the transient output voltage, raised by the over-shoot, to the steady state by switching to the discharging mode, and similarly charge the transient output voltage, dropped by the under-shoot, to the steady state by switching to the charging mode. This mechanism may allow DC-DC converters with higher slew rate to make transient ripples of output voltage to return to steady state more quickly, and additionally allow a better level of noise immunity.12-17-2009
20100141224DIGITAL CHARGE-MODE CONTROL OF A POWER SUPPLY - Disclosed herein are an apparatus and method for charge-mode control. An embodiment of a charge mode controller may include an analog/digital converter configured to monitor the current through a duty cycle switch and convert the current to a switch current value; an accumulator module configured to integrate the switch current value during the switching cycle and output an accumulated charge value; and a comparator module responsive to the accumulated charge value and a charge set point configured to generate a gate drive signal for the duty cycle switch that turns the duty cycle switch ON when the accumulated charge value is less than the charge set point and turns the duty cycle switch OFF when the accumulated charge value reaches the charge set point and thereby controls the duty cycle of the converter and the power supplied by the power stage.06-10-2010
20090243576ELECTRONIC DEVICE, DETECTION CIRCUIT AND VOLTAGE CONTROL METHOD - A voltage control method includes producing an error signal based on a difference between a reference signal and an adaptor voltage and an adaptor current corresponding to the adaptor voltage, regulating, based on the error signal, the adaptor voltage, comparing a reference voltage to a voltage proportional to a potential corresponding to an identifying voltage corresponding to the adaptor voltage, detecting, based on the comparison result, whether or not a couplable external power source is suitable, and setting based, on the detection result, a potential corresponding to the identifying voltage.10-01-2009
20100194363Apparatus for generating high-voltage and method thereof - Provided are a high voltage generating apparatus controlled by a digital control code and a method thereof. The high voltage generating apparatus includes a switching unit for controlling a voltage induced at the secondary coil of a power transformer by an interrupt operation, wherein the interrupt operation interrupts the current flowing through the primary coil of the connected power transformer. A digital controller for controlling the interrupt operation of the switching unit according to the control data. A digital interface for providing the control data to the digital controller is provided. The control data is extracted from the control code transferred using one of a plurality of predetermined communication protocols. The switching unit, digital interface, and digital controller can be implemented in one ASIC (application-specific integrated circuit) chip.08-05-2010
20110062927SWITCHING POWER SUPPLY DEVICE, SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE AND POWER SUPPLY DEVICE - A switching power supply device performs a stable operation with fast response for a semiconductor integrated circuit device. A capacitor is provided between the output side of an inductor and a ground potential. A first power MOSFET supplies an electric current from an input voltage to the input side of the inductor. A second power MOSFET turned on when the first power MOSFET is off allows the input side of the inductor to be of a predetermined potential. A first feedback signal corresponding to an output voltage obtained from the output side of the inductor and a second feedback signal corresponding to an electric current flowed to the first power MOSFET are used to form a PWM signal. The first power MOSFET has plural cells of a vertical type MOS-construction.03-17-2011
20110062926SYSTEM AND METHOD FOR CONTROLLING A VOLTAGE SUPPLY - A system, voltage supply circuit, control unit for a voltage supply circuit, and method of controlling a voltage supply circuit are disclosed. For example, a system is disclosed that comprises at least one electronic circuit and a voltage supply unit coupled to an input of the at least one electronic circuit. The voltage supply unit includes a power unit to supply a voltage to the at least one electronic circuit and a control unit to control an operating mode of the power unit, an output of the control unit coupled to an input of the power unit. The control unit includes a mode selector to select the operating mode of the power unit, coupled to at least a first output of the power unit, an amplifier coupled to the at least a first output of the power unit, a compensation circuit, and a first switching unit coupled to the mode selector and the compensation circuit, to couple the compensation circuit to the amplifier if a selected operating mode of the power unit is a first mode.03-17-2011
20110062925VOLTAGE RANGE DETERMINATION CIRCUIT AND METHODS THEREOF - A voltage range determination circuit may include an object voltage generating unit that generates an object voltage corresponding to a scaled-down voltage of an input voltage based on the input voltage, a selection voltage generating unit that generates a first selection voltage and a second selection voltage that is greater than the first selection voltage based on a reference voltage, a comparison voltage selecting unit that selects one of the first selection voltage and the second selection voltage as a comparison voltage based on an output signal, and an output signal generating unit that compares the object voltage with the comparison voltage to generate the output signal.03-17-2011
20110062923SWITCHING POWER SUPPLY CIRCUIT - A switching power supply circuit includes a power circuit, a switching circuit and a load. The switching circuit includes a first filter module, a power processing unit, a stability module, and a second filter module. The first filter module receives a voltage signal from the power circuit and sends a filtered first voltage signal to the power processing unit; the power processing unit outputs a second voltage signal, the stability module stabilizes the second voltage signal and sends a third voltage signal to the second filter module; the second filter module filters the third voltage signal and sends a drive voltage to the load. In response to the second voltage signal instantaneously changing from high to low or low to high, during the change in current, power of the second voltage signal is stored in the stability module and released through the second filter module.03-17-2011
20110062922LOW DROPOUT REGULATOR - The present invention relates to a low dropout regulator, and more particularly to a low dropout regulator without load capacitor and ESR (equivalent series resistance) designed in response to the discharge curve of a Li-ion battery, includes an input terminal, a reference circuit, a power transfer element, a level regulating device, a regulating circuit, and a first N-type MOSFET. The regulating circuit detects a load change at an output terminal, amplifies the load change, and couples it to the level regulating device. The level regulating device receives and boosts a received signal and transmits the received signal to the power transfer element, so as to achieve the effect of controlling the power of a power supply.03-17-2011
20100085026POWER SOURCE DEVICE AND OUTPUT VOLTAGE STABILIZING METHOD - A power source device includes: a switching section switching an input voltage supplied to a load section; a smoothing inductor section smoothing and outputting an output current to be supplied to the load section in accordance with a switching of the switching section; a first inductor section decreasing an output inductance value of the smoothing inductor section; a second inductor section increasing the output inductance value of the smoothing inductor section; an electromagnetic induction activating section activating the electromagnetic induction between the smoothing inductor section and the first or the second inductor section; a load current fluctuation detecting section detecting a steep fluctuation in a load current; and a control section controlling the electromagnetic induction activating section so as to activate the electromagnetic induction between the smoothing inductor section and the first or the second inductor section when the steep fluctuation of the load current is detected.04-08-2010
20100085025DRIVING CIRCUIT OF LOAD - A driving circuit of a load has an output semiconductor element connected in series in a power supply path from a power source to the load, to control a current of the load, a PWM signal generator for controlling ON/OFF of the output semiconductor element, a driver of the output semiconductor element according to the PWM signal, a detection resistor made of a semiconductor detecting a current of the load, a current output amplifier outputting a monitored current of detection resistor without being influenced by variation of ambient temperature, a resistor converting the monitored current into a monitored voltage, a current source outputting a constant current without being influenced by variation of ambient temperature, a resistor outputting a reference voltage according to the constant current, and an A/D converter converting the monitored voltage according to the reference voltage into a detected current value of the current of the load.04-08-2010
20090302816SWITCHING POWER SUPPLY AND SEMICONDUCTOR DEVICE USED FOR THE SAME - According to the present invention, it is possible to prevent an overcurrent from passing through a switching element 12-10-2009
20120293148DC/DC CONVERTER AND METHOD FOR THE CURRENT CONTROL OF A DC/DC CONVERTER - A DC/DC converter includes an input to which an input current is supplied, an output at which an output current is provided, and a current control circuit coupled to the input and the output includes a unit that provides an instantaneous value signal proportional to the output current of the DC/DC converter with the aid of the input current, an internal input that supplies a reference signal, and a comparison device coupled to the unit that provides the instantaneous value signal and the internal input and comprises an internal output that provides a control signal dependent on a comparison of the instantaneous value signal with the reference signal, wherein the control signal adjusts the output current of the DC/DC converter.11-22-2012
20110074371SINGLE-BOUND HYSTERETIC REGULATION OF SWITCHED-CAPACITOR CONVERTERS - A voltage regulator may include a comparator with a first comparator input to receive a reference voltage, a second comparator input to receive an output voltage from a phase interleaved converter, and a comparator input. The regulator may also include a set of cascaded flip-flops corresponding to phases of the converter. The set of cascaded flip-flops may have a plurality of phase outputs to trigger a phase transition in the converter if the output voltage falls below the reference voltage.03-31-2011
20100079122System and Method for Adapting Clocking Pulse Widths for DC-to-DC Converters - A system and method for adapting a width of a clocking pulse for clocking a DC-DC converter, wherein the width of the clocking pulse is selected based upon the duty cycle of the DC-DC converter. When the DC-DC converter operates below a predefined threshold duty cycle, a clocking pulse of a first width is selected to allow operation of the converter at a minimum predefined duty cycle with a clocking frequency that minimizes output voltage ripple. The first width corresponds to an on-time of a switching transistor of the DC-DC converter when the converter is operated at the minimum duty cycle. When the DC-DC converter operates above the predefined threshold duty cycle, a clocking pulse of a second width is selected to allow operation of the converter at high duty cycles while simultaneously avoiding missed inductor current pulses and generation of sub-harmonic voltage oscillations.04-01-2010
20100090668Stacked Field Effect Transistor Configurations - An improved organization for a MOSFET pair mounts first and second FET dies in an overlying or stacked relationship to reduce the surface area ‘footprint’ of the MOSFET pair. The source and drain of a high side FET04-15-2010
20110169467TIME SEQUENCE CONTROL CIRCUIT - A time sequence control circuit is provided to control time sequence of a motherboard of a computer. A first voltage received by a power supply receiving terminal is greater than a preset voltage before a signal control terminal on the motherboard receives a second voltage during turning on the computer. During shutting off the computer, the first voltage at the power supply receiving terminal drops and is less than the preset voltage, and the second voltage supplied to the signal control terminal on the motherboard is shut off.07-14-2011
20090243572Power Supply with Digital Control Loop - A switching regulator apparatus includes an inductor coupling an input node to a switching node. A first capacitor couples the switching node to a diode node. A first diode couples the diode node to a common node. A second diode couples the diode node to an output node. A second capacitor couples the output node to the common node. A switch couples the switching node to the common node, wherein the first capacitor transfers energy from the input node to the output node in accordance with the commutation of the switch.10-01-2009
20090140707Circuit for an Active Diode and Method for Operating an Active Diode - Embodiments of the invention relate to a circuit for an active diode, a method for operating an active diode, and, based thereon, an integrated active diode system, a rectifier, and a system for voltage conversion and/or regulation, comprising at least one transistor by which a current defined as positive from a first connection to a second connection of the transistor can be controlled, and at least one measuring/control circuit (for determining the current by means of which the at least one transistor can be switched on for currents under and at most up to a predetermined, non-positive threshold value (i1<=ith<=0), and can otherwise be switched off.06-04-2009
20100123442RECONFIGURABLE REGULATOR AND ASSOCIATED METHOD - One embodiment of the invention includes a regulator system that includes a high-side power transistor electrically connected between a first node and a second node. The system also includes a low-side power transistor electrically connected between the second node and a third node. The high and low-side power transistors can be controlled by high and low-side control signals, respectively. A mode controller provides at least one mode control signal having a value to enable operation of the regulator system in each of a buck switching, boost switching, negative switching, and linear regulator mode. The regulator system can utilize at least one of the high-side power transistor and the low-side power transistor to operate in the selected mode depending on at least one of an input voltage and an arrangement of external circuitry that are electrically coupled to at least one of the first, second, and third nodes to provide a regulated output voltage.05-20-2010
20110169468Power Conversion System and Power Control Method for Reducing Cross Regulation Effect - A power conversion system and power control method for reducing cross regulation effect uses a voltage feedback adjustment circuit to modulate an error signal fed back from an output voltage so as to predict the energy of an output corresponding to its load states. While the energy delivered to an output terminal with its load remaining the same does not change, the energy delivered to an output terminal with its load changing is adjusted accordingly. The power conversion system thus effectively reduces the cross regulation effect and obtains excellent steady system output and transient response.07-14-2011
20110169466METHODS AND CONTROL CIRCUITS FOR CONTROLLING BUCK-BOOST CONVERTING CIRCUIT TO GENERATE REGULATED OUTPUT VOLTAGE UNDER REDUCED AVERAGE INDUCTOR CURRENT - A method of controlling a buck-boost converting circuit is provided. The buck-boost converting circuit has an inductive element, a first conduction controlling element, a second conduction controlling element, a third conduction controlling element, and a fourth conduction controlling element. The method includes: controlling the first and third conduction controlling elements to be electrically conductive and the second and fourth conduction controlling elements to be electrically nonconductive according to a first duty setting; determining a second duty setting whose generation is independent of that of the first duty setting; controlling the first and fourth conduction controlling elements to be electrically conductive and the second and third conduction controlling element to be electrically nonconductive according to the second duty setting; and controlling the second and fourth conduction controlling elements to be electrically conductive and the first and third conduction controlling elements to be electrically nonconductive according to a third duty setting.07-14-2011
20090273324SWITCHING REGULATOR - A switching regulator which does not require a capacitor having large time constant as a soft start circuit, reduces variation of the soft start time and the time until a start of a power source voltage stabilizing control11-05-2009
20090295350Reverse current stopping circuit of synchronous rectification type DC-DC Converter - A reverse current stopping circuit includes a synchronous rectification device, a comparator for detecting a reverse current of an inductor, the synchronous rectification device being turned off when the reverse current is detected by the comparator, a reverse current detector circuit for detecting a switching terminal voltage after the synchronous rectification device is turned off, thereby determining a value of the inductor current to decide whether the inductor current is flowing in a reverse direction or a forward direction, and a memory unit for receiving a predetermined output signal from the reverse current detector circuit in accordance with a result of the reverse current detector circuit, and outputting a control signal for an offset voltage in accordance with the predetermined output signal. The offset voltage is changed in accordance with the control signal so as to adjust the inductor current to zero when the synchronous rectification device is turned off.12-03-2009
20090295348Constant current and voltage controller in a three-pin package with dual-use power pin - A flyback converter includes a controller integrated circuit (IC) housed in an IC package with only three terminals. An inexpensive TO-92 transistor package can be used. A switch terminal is coupled to an inductor switch that is turned on by a switch control signal having a frequency and a pulse width. The inductor switch controls the current that flows through a primary inductor of the flyback converter. The controller IC adjusts the frequency in a constant current mode such that output current remains constant and adjusts the pulse width in a constant voltage mode such that output voltage remains constant. A power terminal receives a feedback signal that is derived from a voltage across an auxiliary inductor of the flyback converter. The feedback signal provides power to the controller IC and is also used to generate the switch control signal. The controller IC is grounded through a ground terminal.12-03-2009
20090278520Power Converter with Capacitive Energy Transfer and Fast Dynamic Response - A converter circuit and related technique for providing high power density power conversion includes a reconfigurable switched capacitor transformation stage coupled to a magnetic converter (or regulation) stage. The circuits and techniques achieve high performance over a wide input voltage range or a wide output voltage range. The converter can be used, for example, to power logic devices in portable battery operated devices.11-12-2009
20100219801SWITCHING POWER SUPPLY, CONTROL CIRCUIT CONTROLLING SWITCHING POWER SUPPLY AND CONTROL METHOD OF SWITCHING POWER SUPPLY - A switching power supply includes: a first switch provided between one end of a DC power supply and one end of a load; a second switch provided between a node of the first switch located on a load side and another end of the DC power supply; a capacitor provided between the second switch and the another end of the DC power supply; a third switch provided between a node of the first switch located on a DC power supply side and a node between the second switch and the capacitor; and a delay circuit that is provided between the third switch and the node between the second switch and the capacitor and delays a current for charging the capacitor, wherein the second switch is turned on in a period during which the first switch is kept on.09-02-2010
20090289610LOW DROPOUT REGULATOR - The present invention provides a low dropout (LDO) regulator with a stability compensation circuit. A “zero frequency” tracking as well as “non-dominant parasitic poles' frequency reshaping” are performed to achieve a good phase margin for the LDO by means of the compensation circuit. In this compensation method neither a large load capacitor nor its equivalent series resistance is needed to stabilize a regulator. LDO regulators, in system on chip application, having load capacitors in the range of few nano-Farads to few hundreds of nano-Farads can be efficiently compensated with this compensation method. A dominant pole for the regulator is realized at an internal node and the second pole at an output node of the regulator is tracked with a variable capacitor generated zero over a range of load current to cancel the effect of each other. A third pole of the system is pushed out above the unity gain frequency of the open loop transfer function with the help of the frequency compensation circuit. The compensation technique is very effective in realizing a low power, low-load-capacitor LDO desirable for system on chip applications.11-26-2009
20090261793DC/DC POWER CONVERTING APPARATUS - Three or more circuits, in which series-connected low-voltage and high-voltage side switches including MOSFETs including parasitic diodes are connected across positive and negative terminals of each of smoothing capacitors, are connected in series. One of elementary series circuits, each including a capacitor and an inductor, is disposed between any adjacent two of the circuits with the elementary series circuits set to have the same period of resonance. The MOSFETs of rectifier circuits are brought into an ON state simultaneously with the MOSFETs of a driving inverter circuit and brought into an OFF state earlier than the MOSFETs of the driving inverter circuit by a period of time not exceeding a time period equal to (period of resonance)/2. A resonance phenomenon of the capacitor and the inductor is used and conduction loss in the rectifier circuits is reduced in DC/DC power conversion performed through charging and discharging operation of the capacitor.10-22-2009
20090261792NEGATIVE VOLTAGE GENERATING DEVICE - The negative voltage generating device includes a current interrupting controller, a voltage generating controller, and a negative voltage generator. The current interrupting controller outputs a current interrupting control signal in response to a control signal, which is enabled during the application of a power-up signal. The voltage generating controller compares a first reference voltage to a feedback voltage in response to the current interrupting control signal and outputs a voltage generating control signal. The negative voltage generator generates the feedback voltage and a second negative voltage by receiving the first negative voltage in response to the voltage generating control signal.10-22-2009
20090261791Power Converter with Power Switch Operable in Controlled Current Mode - A power converter and method of controlling a power switch therein to improve power conversion efficiency at low output current. In one embodiment, the power converter includes a first power switch coupled to a source of electrical power and a second power switch coupled to the first power switch and to an output terminal of the power converter. The power converter also includes a controller configured to alternately enable conduction of the first and the second power switches with a duty cycle in response to an output characteristic of the power converter. The controller is configured to control a level of current in the first power switch when the second power switch is substantially disabled to conduct.10-22-2009
20100213910METHOD AND APPARATUS FOR EXTERNAL CONTROL MODE STEP DOWN SWITCHING REGULATOR - A switching regulator integrated circuit (IC) is disclosed that includes a switch circuit that further includes a first switch and a second switch, a mode selector circuit controlled by external circuitry to select between a first mode and a second mode, and a control circuit. In response to a feedback signal from the switch circuit, when the first mode is selected, the control circuit toggles the first switch and the second switch ON and OFF alternately at a fixed first frequency. When a second mode is selected, the control circuit causes the second switch to turn OFF completely and the first switch to switch ON and OFF at a variable second frequency.08-26-2010
20120293147Monolithic Group III-V Power Converter - A power arrangement that includes a monolithically integrated III-nitride power stage having III-nitride power switches and III-nitride driver switches.11-22-2012
20120293149Device for Generating an Adjustable Bandgap Reference Voltage with Large Power Supply Rejection Rate - An adjustable bandgap reference voltage comprises means for generating current proportional to absolute temperature comprising first means connected to terminals of a core and designed to equalize voltages across the terminals, means for generating a current inversely proportional to absolute temperature connected to the core, and an output module designed to generate the reference voltage; the first processing means comprise a first amplifier possessing a stage, biased by the current inversely proportional to absolute temperature, arranged according to a folded setup and comprising first PMOS transistors arranged according to a common-gate setup, and a stage whose input is connected to the amplifier output and whose output is connected to the first stage input and to a terminal of the core, the second generating means comprise a follower amplifier setup connected to a terminal of the core and separated from the first amplifier, the output module is connected to the feedback stage.11-22-2012
20120293146CONTROL CIRCUIT AND METHOD FOR AUDIBLE NOISE SUPPRESSION IN A POWER CONVERTER - A control circuit is configured for controlling a power switch to regulate an output of a power converter. The control circuit is configured to increase a switching frequency of the power switch when a first signal representing a magnitude of the power converter is below a first output level. In some embodiment, the first output level is selected such that when the first signal is below the first output level, the power converter may generate audible noise. In an embodiment, when the first signal is above the first output level, the control circuit is configured to turn off the power switch when a second signal representing a current in the power switch is above a first reference level. On the other hand, when the first signal is below the first output level, the control circuit is configured to turn off the power switch if the second signal reaches a lower reference level.11-22-2012
20120293145BUCK CONVERTER - A buck converter comprising a controller arranged to monitor an output voltage of the converter, the controller comprising: a comparator arranged to compare an output voltage at an output of the buck converter with a reference voltage, and a modification circuit within the comparator or connected to a modification signal input of the comparator and arranged to produce a correction signal to modify the operation of the comparator.11-22-2012
20100127678CONTROL CIRCUIT FOR DC-DC CONVERTER, CONTROL METHOD FOR DC-DC CONVERTER, AND ELECTRONIC DEVICE - A control circuit for a DC-DC converter includes a controller configured to control, based on a feedback voltage, a first switch provided between an inductor and a reference potential and a second switch provided between a coupling node of the first switch and the inductor and an output terminal, a third switch provided between the second switch and the output terminal and turned off when an overcurrent flows in a coupling path between the second switch and the output terminal, and a selector configured to select a voltage of a first position which is located on a side of the second switch in the coupling path as the feedback voltage when the third switch is turned off, or a voltage of a second position which is located on a side of the output terminal in the coupling path as the feedback voltage when the third switch is turned on.05-27-2010
20100127681METHODS AND SYSTEMS FOR POWER SUPPLY ADAPTIVE CONTROL UTILIZING TRANSFER FUNCTION MEASUREMENTS - Methods and systems, utilizing simplified digital hardware, for measuring parameters needed for control of a system (referred to as a plant) such as a power supply or motor. In one embodiment, the system for measuring the desired parameters includes simplified digital hardware to implement the functionality of transfer function measurement in the plant.05-27-2010
20100277146COMPUTER POWER SUPPLY AND STANDBY VOLTAGE DISCHARGE CIRCUIT THEREOF - A computer power supply includes a standby voltage output terminal to output a standby voltage, a power connector connected to the standby voltage output terminal, and a standby voltage discharge circuit including a zener diode, first and second electrical switches. The standby voltage output terminal is connected to a cathode of the diode. An anode of the diode is connected to a first terminal of the first electrical switch. A second terminal of the first electrical switch is grounded. A third terminal of the first electrical switch is connected to a first terminal of the second electrical switch and the standby voltage output terminal via a first resistor. A second terminal of the second electrical switch is grounded. A third terminal of the second electrical switch is connected to the standby voltage output terminal via a second resistor. A capacitor is connected between the standby voltage output terminal and ground.11-04-2010
20110204861DC-DC converter efficiency improvement and area reduction using a novel switching technique - Systems and methods to achieve a switched DC-to-DC converter having an improved efficiency have been disclosed. A control logic allows continuous switching to bring the DC-to-DC converter to a final output value during a startup phase, it allows skipping of clock switching pulses if they are not needed and allows burst mode of switching pulses dependent on a load applied to the output voltage of the DC-to-DC converter. No digital or analog regulator is required for the control logic.08-25-2011
20110199062DC/DC Converter Arrangement and Method for DC/DC Conversion - A DC/DC converter arrangement comprises an input terminal (08-18-2011
20100102789SWITCH-MODE POWER SUPPLY METHOD AND APPARATUS USING SWITCH-NODE FEEDBACK - Example switch mode power supplies, including buck converters, with indirect, switch-mode feedback for pulse width modulation and duty cycle control are described and shown. Non-idealities are corrected with several example compensation methods and apparatus, including current sense and corresponding voltage adjustment.04-29-2010
20100102786Circuit Arrangement for Reduced Switch Load - A circuit arrangement for two serially connected semiconductor switches connected to a voltage supply is provided. Between the semiconductor switches a primary winding of a transformer is connected. A first diode is connected on an anode side to a potential of the voltage supply at a source terminal of the second semiconductor switch and on a cathode side to a first connection terminal facing the first semiconductor switch on the primary winding. A second diode is connected on the cathode side to the potential of the voltage supply at a drain terminal of the first semiconductor switch and on the anode side to a second connection terminal facing the second semiconductor switch on the primary winding. A first secondary winding of the transformer is provided, connected in series between the first diode and the first connection terminal, and a second secondary winding, connected in series between the second diode and the second connection terminal.04-29-2010
20100102788DC-DC CONVERTER - A DC-DC converter including, an inductor; and a driving switching element for performing switching to a flow path to flow an electric current through the inductor; wherein the DC-DC converter drives the driving switching element by PWM control using a PWM control pulse to convert a direct-current input voltage supplied from a direct-current power source and to output a direct-current voltage having a piece of electric potential different from that of the direct-current input voltage, and wherein the DC-DC converter drives the driving switching element by the PWM control under a first condition, and the DC-DC converter makes the driving switching element be in an on-state continuously while the output direct-current voltage is lower than a desired level under a second condition.04-29-2010
20080246453POWER SUPPLY SYSTEM USING DELAY LINES IN REGULATOR TOPOLOGY TO REDUCE INPUT RIPPLE VOLTAGE - A power supply system for reducing input ripple voltage, the system including: a first regulator having at least two inputs, one input being a voltage input pin and another input being a synchronization pin; a second regulator having at least two inputs, one input being a voltage input pin and another input being a synchronization pin; a Nth regulator having at least two inputs, one input being a voltage input pin and another input being a synchronization pin; wherein outputs of the first regulator, second regulator, and Nth regulator are connected to a single power bus or correspondingly to separate power buses; a first delay connected to the synchronization pin of the second regulator; a second delay connected to the synchronization pin of the Nth regulator; wherein the first delay and the second delay have different delays configured for enabling the first regulator, second regulator, and the Nth regulator to operate out of phase; and a master clock for providing timing control to the first and second delay.10-09-2008
20080246452Device and Method For Charging an Electrical Energy Storage Device - A device is described for charging an electrical energy storage device, which has an active current-limiting device in a main current path in order to limit a supply current to a predefined maximum current. A voltage transformer device is situated downstream from the current-limiting device for raising the potential of the electrical energy storage device over a supply potential.10-09-2008
20080238386APPARATUS FOR DELIVERING HARMONIC INDUCTIVE POWER - Method and apparatus for providing harmonic inductive power, and more particularly for delivering current pulses providing a desired amount of pulse energy in high frequency harmonics to a load circuit for inductive heating of an article. By controlling the shape and/or frequency of such current pulses, the apparatus and method can be used to enhance the rate, intensity and/or power of inductive heating delivered by the heater coil and/or to enhance the lifetime or reduce the cost and complexity of an inductive heating power supply. Of particular significance, the apparatus and method may be used to significantly increase the power inductively delivered to a ferromagnetic or other inductively heated load, without requiring an increase of current in the heater coil. This enables new heating applications, and in some known applications, decreases the energy consumption or cooling requirements and/or increase the lifetime of the heater coil.10-02-2008
20080238387DUAL MODE REGULATION LOOP FOR SWITCH MODE POWER CONVERTER - The invention relates to a DC-DC converter, which includes a power stage driven by a pulse width modulator, a first error amplifier with a first input coupled to a first reference voltage source and a second input coupled to a current sink through which a current is fed from an output of the power stage to receive a first feedback voltage (FB10-02-2008
20080238389Primary only control quasi resonant convertor - A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for transferring a reflected voltage signal. A transformer includes a primary and a secondary, the primary is coupled with the converter circuit. The primary and secondary each include a single winding. An output rectifier circuit is coupled with the secondary of the transformer. A resonant circuit is included in the converter circuit and is coupled with the primary. The resonant circuit includes one or more resonance capacitors that are configured for providing a transformer resonance. The transformer resonance comprises the reflected voltage signal, the capacitance of the one or more resonance capacitors and a parasitic capacitance of the transformer. The reflected voltage signal is reflected from the secondary to the primary. A virtual output voltage feedback loop provides an output voltage reference signal to the converter circuit via the resonant circuit. The converter circuit is responsive to the output voltage reference signal in regulating an output voltage.10-02-2008
20080238388POWER SUPPLY DEVICE AND RECORDING APPARATUS - A power supply device includes a DC-DC converter configured to regulate an output voltage based on an externally input instruction, and a discharge circuit connected to an output capacitor of the DC-DC converter, wherein the discharge circuit includes a switch element configured to switch between a conductive state and a nonconductive state according to an instruction, and a capacitor-resistor (C-R) circuit configured to charge electric charge accumulated in the output capacitor of the DC-DC converter when the switch element is conductive and to discharge the electric charge to ground when the switch element is nonconductive.10-02-2008
20100127676POWER SOURCE APPARATUS - Disclosed is a power source apparatus including: a connector for outputting electric power, wherein the apparatus performs power output through a cable connected to the connector, a power source circuit capable of changing an output thereof; a control circuit to perform output control of the power source circuit; and a first detection circuit including an input terminal for detection connected to wiring on a side of a tip of the cable to perform detection pertaining to an output quantity of electric power, wherein the output control is performed based on a detection signal of the first detection circuit, the detection signal fed back to the control circuit.05-27-2010
20090167268Power Supply - A switching regulator for regulating an ac signal, and method of supplying power thereto are provided. The regulator includes a positive half cycle part and a negative half-cycle part arranged to regulate the respective parts of an input ac signal. Each half-cycle part comprises a modulating transistor, having an associated modulator diode, and a clamping diode arranged to protect the modulating transistor from reverse-bias voltages and having an associated clamp switch. The regulator further provides a first switching controller operable to cause the modulating transistors to switch and a second, separate switching controller operable to cause the clamp switches to switch.07-02-2009
20090167267Power Converter with Monotonic Turn-On for Pre-Charged Output Capacitor - A power converter for and method of producing a monotonic rise in output voltage at start-up. In one embodiment, the power converter includes a switch and an error amplifier coupled to an output terminal of the power converter. The power converter also includes a comparator with an output terminal coupled to a control terminal of the switch and an input terminal coupled to an output terminal of the error amplifier configured to enable the switch to conduct for a duty cycle. Additionally, the switch is configured to be turned off at a start-up of the power converter until a voltage of the output terminal of the error amplifier provides a duty cycle for the switch corresponding to an output characteristic pre-charge condition.07-02-2009
20080284394Low dropout voltage regulator with improved voltage controlled current source - Techniques pertaining to designs of a compensation voltage controlled current source (VCCS) used in low dropout voltage regulators are disclosed. According to one aspect of the present invention, a compensation voltage controlled current source (VCCS) is so designed to meet the low input/output voltage requirements. Various features of the VCCS are demonstrated through several embodiments.11-20-2008
20080284396SEMICONDUCTOR DEVICE PROVIDED WITH FEEDBACK CIRCUIT INCLUDING RESISTIVE ELEMENT AND CAPACITIVE ELEMENT - The present invention provides a switching power supply circuit capable of stabilizing an output voltage as well as increasing a response speed of the output voltage by improving a phase margin of an open loop as a whole of the switching power supply circuit. The switching power supply circuit according to the present invention includes a resistor and a capacitor in addition to a configuration of a conventional switching power supply circuit. The resistor is connected between a node and the capacitor. The capacitor is connected between the resistor and another node. The resistor and the capacitor configure a phase compensation circuit. The phase compensation circuit has a cut-off frequency in accordance with a resonance frequency of an inductor and a capacitor by adjusting a resistance value of the resistor and a capacitance of the capacitor.11-20-2008
20090295349Constant current and voltage controller in a three-pin package with dual-use switch pin - A flyback converter includes a controller integrated circuit (IC) housed in an IC package with only three terminals. The controller IC is grounded through a ground terminal. A feedback signal is received onto a power terminal. The feedback signal powers the controller IC and is derived from a voltage across an auxiliary inductor of the flyback converter. A switch terminal is coupled to an inductor switch that is turned on by a switch control signal having a frequency and a pulse width. The inductor switch controls the current that flows through a primary inductor of the flyback converter. A switch signal is received onto the switch terminal and is used to generate the inductor switch control signal. The controller IC adjusts the frequency in a constant current mode such that output current remains constant and adjusts the pulse width in a constant voltage mode such that output voltage remains constant.12-03-2009
20080303499CONTROL CIRCUIT AND METHOD FOR MULTI-MODE BUCK-BOOST SWITCHING REGULATOR - A control circuit of a multi-mode buck-boost switching regulator and a method thereof are provided. The control circuit imposes ON/OFF timing sequences on switches according to the relationship between two controlling triangle waves and the load fluctuation. In each working cycle of each mode of the regulator, at most two switches perform switching operations. The control circuit is simple to design, which only includes simple digital elements, such as comparators, logic gates etc., instead of complicated analog circuits.12-11-2008
20080309303SWITCHING POWER SUPPLY AND REGULATION CIRCUIT - The present invention provides a switching power supply that enables a reduction in noise without the need for an anti-noise component such as a filter circuit. A secondary current on period detecting circuit detects a first period during which a secondary current flows, the secondary current starting to flow through a secondary winding after a switching element is turned off. A secondary current on duty control circuit oscillates a clock signal set turning on the switching element so as to maintain, at a constant value, an on duty ratio of the first period to a third period made up of the first period and a second period during which the secondary current does not flow. A secondary current on duty modulating circuit applies a modulation component to the on duty ratio to periodically modulate the on duty ratio and thus the oscillation frequency of the switching element.12-18-2008
20080309301 Didirectional DC-DC converter and power supply apparatus with the same - A bidirectional DC-DC converter 12-18-2008
20090033301POWER ELECTRONICS DEVICES WITH INTEGRATED GATE DRIVE CIRCUITRY - A power switch apparatus includes a substrate; a semiconductor die mounted on the substrate and including power electronics circuitry for a high power, alternating current motor application; and gate drive circuitry mounted on the substrate and electrically coupled to the power electronics circuitry on the semiconductor die.02-05-2009
20090027023Switching regulator circuit - Provided is a switching regulator having satisfactory energy conversion efficiency during light load conditions. Such a structure is employed that an oscillating frequency for the switching regulator and a drive capability of a switch element are variable and such a control is taken that during the light load, the oscillating frequency for the switching regulator or the drive capability of the switch element is reduced.01-29-2009
20080246454DC/DC CONVERTER - A DC/DC converter is supplied such that the desired output setting voltage can be obtained as the load-side output, even when the difference between the power supply voltage and the output setting voltage of the load-side output is large. This DC/DC converter comprises a switching device, a voltage divider, an error amplifier, an oscillator which outputs a oscillation clock, a slope circuit which receives the oscillation clock and outputs a sawtooth waveform voltage having a slope which begins at the leading edge of the oscillation clock, a comparator which compares the sawtooth waveform voltage and the output voltage of the error amplifier, and a logic circuit which is set by the trailing edge of the oscillation clock, and is reset by the output of the comparator.10-09-2008
20080203986Boosting Switching regulator - When a boosting operation stops, it is ensured that a boosting switching regulator does not output an output voltage. When a high signal is applied to the gate of a PMOS transistor Q08-28-2008
20100207592CLASS DH AMPLIFIER - A class DH amplifier is provided. The amplifier is generally comprised of a tracking power supply, a class D amplifier section, and a carrier generator. The tracking power supply receives a supply voltage and an analog input signal, and the tracking power supply provides an input for the carrier generator. Based on its input from the tracking power supply, the carrier generator can output a positive ramp signal and a negative ramp signal to the class D amplifier section. The class D amplifier section can generate an output signal base on the analog input signal and the ramp signals from the carrier generator.08-19-2010
20100201333SWITCHING POWER SUPPLY - A switching power supply is a buck DC-DC converter that includes a plurality of inductors and switching devices that control the connection relations of the inductors, the ON and OFF of the switching devices are controlled such that the inductors are connected in series to each other while the switching devices are ON and such that the inductors are connected in parallel to each other while the switching devices are OFF for obtaining a low output voltage easily. The ON and OFF of the switching devices are controlled such that some of the inductors are disconnected for realizing a DC-DC converter that exhibits different performance. The switching power supply according to the invention facilitates preventing the circuit scale from being enlarged, preventing especially the number of large-capacity capacitors from increasing and obtaining a low output voltage.08-12-2010
20080272757POWER SUPPLY DC VOLTAGE OFFSET DETECTOR - A power supply output voltage direct current (DC) offset detector determines a DC offset in a power supply output voltage signal, and the output voltage signal has a DC component and an alternating current (AC) “ripple” component. Once during each period of the ripple, the DC offset detector determines the DC offset from an output voltage signal using a comparison between the output voltage signal and a reference voltage. In at least one embodiment, from the comparison and during a period of the ripple, the DC offset detector determines an ‘above’ duration for which the ripple is above the reference voltage, determines a ‘below’ duration for which the ripple is below the reference voltage, or both to determine the DC offset of the power supply output voltage signal. The DC offset detector uses the above and/or below duration(s) to determine the DC offset of the output voltage signal.11-06-2008
20080203987REFERENCE VOLTAGE GENERATOR HAVING IMPROVED SETUP VOLTAGE CHARACTERISTICS AND METHOD OF CONTROLLING THE SAME - A reference voltage generator for improving setup voltage characteristics without an increase in a standby current and a method of controlling the same, in which the reference voltage generator includes: a reference voltage generation unit including a resistor connected between a power supply voltage and an output node, for dividing the power voltage, and generating a reference voltage fed to the output node thereof; a voltage detector receiving a feedback of the reference voltage and detecting a level of the reference voltage; and a bypass circuit connected in parallel to the resistor of the reference voltage generation unit and bypassing the resistor in response to an output signal of the voltage detector.08-28-2008
20100264893POWER SUPPLY APPARATUS AND POWER SUPPLY SYSTEM WITH MULTIPLE POWER SUPPLY APPARATUSES - A power supply apparatus includes a first output power circuit, a first output protection circuit, a first output capacitor, a first pre-charging circuit and a first power supply control circuit. The first output power circuit is used for generating a first internal output voltage. The first output protection circuit is connected to a power output terminal of the first output power circuit for limiting the current direction. The first pre-charging circuit is interconnected between a power input terminal and a power output terminal of the first output protection circuit for providing a first pre-charging path. When the first power-on signal is switched from a disabled status to an enabled status, a first pulse width modulation signal having a higher or the maximum duty cycle is transmitted from the first power supply control circuit to the control terminal of the first switching circuit, thereby enabling the first output power circuit.10-21-2010
20100264889POWER SUPPLY CIRCUIT - A power supply circuit includes a pulse width modulation (PWM) signal generator, a current adjustment unit, a drive unit, and a feedback unit. The PWM signal generator outputs a PWM voltage signal to the drive unit. The drive unit outputs a first control signal to control the current adjustment unit to work, and outputs a first direct current signal and a direct voltage signal. The current adjustment unit outputs a second direct current signal. A working current of the electrical device comes from the first and second direct current signals. The feedback unit generates a feedback voltage signal according to the direct voltage signal, and transmits the feedback voltage signal to the PWM signal generator to adjust the PWM voltage signal.10-21-2010
20080211472PROGRAMMABLE ON-CHIP SENSE LINE - Disclosed herein is a system for controlling power supply voltage to an on-chip power distribution network. The system incorporates a programmable on-chip sensing network that can be selectively connected to the power distribution network at multiple locations. When the sensing network is selectively connected to the power distribution network at an optimal sensing point, a local voltage feedback signal from that optimal sensing point is generated and used to adjust the power supply voltage and, thus, to manage voltage distribution across the power distribution network. Additionally, the system incorporates a policy for managing the voltage distribution across the power distribution network, a means for profiling voltage drops across the power distribution network and a means for selecting the optimal sensing point based on the policy and the profile. Another embodiment of the system can further control power supply voltages to multiple power distribution networks on the same chip.09-04-2008
20080231245Current Source and Control Device - A current source contains a first switching element which is provided with a control input and is embodied and arranged in such a way that an output flow on an output side of a current source can be adjusted according to a control signal at the control input. The current source also contains a reference resistance that is electrically coupled to a first switching element in such a way that a potential difference above the reference resistance represents the output flow. The adjustment signal of a regulator unit depends on the voltage difference above the reference resistance, is the control signal of the first switching element, and contains a time function element which limits a first value of the output flow to a maximum duration and then reduces the value of the output flow.09-25-2008
20080284395Low Dropout Voltage regulator - Techniques pertaining designs of LDO voltage regulators are described. According to one design, the LDO voltage regulator comprises: a differential amplifier circuit having a pair of input terminals and an output terminal, one of the input terminals coupled to a predetermined reference voltage; an intermediate amplifier circuit having an output terminal and an input terminal coupled to the output terminal of the differential amplifier circuit; and an output pass circuit comprising a pass transistor, an output resistor and an output capacitor, the pass transistor having a control terminal coupled to the output terminal of the intermediate amplifier circuit, an input terminal coupled to a power supply and an output terminal coupled to one terminal of the output resistor, the other terminal of the output resistor taken as a voltage output node, the output capacitor coupled between the voltage output node and a ground reference; a feedback circuit including a pair of ladder resistors coupled in series between the voltage output node and the ground reference, a node between the ladder resistors coupled to the other one of the input terminals of the differential amplifier circuit; and a voltage controlled current source circuit having an input terminal coupled to a node between the pass transistor and the output resistor of the output pass circuit and an output terminal coupled to the node between the ladder resistors.11-20-2008
20080272756POWER FACTOR CORRECTION CONTROLLER WITH DIGITAL FIR FILTER OUTPUT VOLTAGE SAMPLING - A power control system includes a digital FIR filter in an output voltage feedback loop of a switching power converter. A feedback loop includes an output voltage signal of the switching power converter. The output voltage signal includes direct current (DC) and alternating current (AC) components. The FIR filter provides discrete samples of an output voltage feedback signal to a switch state controller that allows the switch state controller to generate a control signal that reflects a relatively quick response to changes in the output voltage signal while reducing an influence of the AC component. In at least one embodiment, the FIR filter is configured to generate the discrete samples at a sampling frequency f11-06-2008
20100141228Power Converter with Power Switch Operable in Controlled Current Mode - A power converter and method of controlling a power switch therein to improve power conversion efficiency at low output current. In one embodiment, the power converter includes a first power switch coupled to a source of electrical power and a second power switch coupled to the first power switch and to an output terminal of the power converter. The power converter also includes a controller configured to alternately enable conduction of the first and the second power switches with a duty cycle in response to an output characteristic of the power converter. The controller is configured to control a level of current in the first power switch when the second power switch is substantially disabled to conduct.06-10-2010
20110006744SYSTEM, METHOD AND APPARATUS TO TRANSITION BETWEEN PULSE WIDTH MODULATION AND PULSE-FREQUENCY MODULATION IN A SWITCH MODE POWER SUPPLY - A switch mode power supply (SMPS) has optimized efficiency over an entire operating range, from no load to full load, by transitioning between pulse frequency modulation (PFM) and pulse width modulation (PWM) for control of the SMPS depending upon load current. Accurate, smooth, and seamless transitions between PFM and PWM modes of operation occur at a preset load current(s). PFM operation improves efficiency during light load conditions, and PWM has better efficiency at higher load currents. This is advantageous in battery powered applications, and thereby results in a longer time before battery replacement or recharge is necessary.01-13-2011
20110006743Controlling A Multi-Mode Switching Converter - Systems and methods for controlling a switching converter using a duty cycle associated with either a buck mode or a boost mode of the switching converter. More particularly, a controller determines when to change between buck mode and boost mode based on the duty cycle associated with one of the buck mode or the boost mode.01-13-2011
20090051336Integrating current regulator and method for regulating current - Current regulators and related methods for regulating a current through a load. The current regulator may include, for example, a first circuit configured to determine an amount of current that flows through the load; and a second circuit configured to cause a voltage to be applied across the load, the voltage having a duty cycle that depends on the amount of the current flowing through the load.02-26-2009
20120105037Voltage Conversion Device Capable of Enhancing Conversion Efficiency - A voltage conversion device capable of enhancing conversion efficiency includes a charge pump for generating output voltage linear to input voltage according to the input voltage, a feedback unit for generating a feedback signal according to the output voltage generated by the charge pump, and a regulating unit for outputting and adjusting the input voltage according to the feedback signal provided by the feedback unit, so as to keep the output voltage unchanged.05-03-2012
20120105036VOLTAGE GENERATION CIRCUIT WHICH IS CAPABLE OF EXECUTING HIGH-SPEED BOOST OPERATION - According to one embodiment, a voltage generation circuit includes a first boost circuit, a voltage division circuit, a first detection circuit, a capacitor and a first switch. The first boost circuit outputs a first voltage. The voltage division circuit divides the first voltage. The first detection circuit is configured to detect a first monitor voltage supplied to the first input terminal, based on a reference voltage which is supplied to a second input terminal of the first detection circuit, and to control an operation of the first boost circuit. The capacitor is connected between an output terminal of the first boost circuit and the first input terminal of the first detection circuit. The first switch cuts off a connection between the capacitor and the first detection circuit, based on an output signal of the first detection circuit, until the first voltage is output from the first boost circuit.05-03-2012
20120105035Buck Circuit Having Fast Transient Response Mechanism and Operation of the Same - A buck circuit having a fast transient response mechanism is provided. The buck circuit comprises a high side MOS, a low side MOS, a transient control module and an operation control module. The low side MOS is connected to the high side MOS at a connection point for generating an output voltage to an external load according to an input voltage from the high side MOS. The operation control module controls the operation of the high and the low side MOS according to the output voltage when the external load is in a heavy load state such that the transient control module is disabled. When the external load turns from the heavy load state to a light load state such that the output voltage raises over a predetermined level, the transient control module is enabled to turn on the low side MOS for discharging to pull down the output voltage.05-03-2012
20120105034Controlling a Dead Time of a Switching Voltage Regulator - Embodiments for at least one method and apparatus of controlling a dead time of a switching voltage regulator are disclosed. One method includes generating a regulated output voltage based upon a switching voltage. The method included generating the switching voltage through controlled closing and opening of a series switch element and a shunt switch element, wherein the dead time comprises time that both the series switch element and the shunt switch element are open. The duration of the dead time is adjusted based on a rate of change of the switching voltage.05-03-2012
20100270994ADJUSTABLE VOLTAGE REGULATOR FOR PROVIDING A REGULATED OUTPUT VOLTAGE - Voltage regulators, memories, and methods for providing a regulated output voltage are disclosed. For example, one such voltage regulator includes a comparator circuit, a driver circuit, an impedance circuit, and a modulation circuit. The comparator circuit generates an output voltage according to a difference between a reference voltage and a feedback voltage. The driver circuit is coupled to an output of the comparator circuit and drives the regulated output voltage at an output node according to the output voltage from the comparator circuit. The impedance circuit is coupled to the comparator circuit and provides the feedback voltage to the comparator circuit in response to a detection current from the output node. The modulation circuit is coupled to the impedance circuit and adjusts a modulation current component of the detection current to adjust the regulated output voltage.10-28-2010
20100270992SEMICONDUCTOR DEVICE - A semiconductor device having two semiconductor chips sealed in a sealant (2-in-1 package) is provided. A power MOSFET chip for control is disposed on an input-side plate lead portion, wherein a source electrode and a gate electrode are formed on a main surface of the chip and the source electrode is connected to an output plate lead portion. A power MOSFET chip for synchronization is disposed on an output-side plate lead portion, wherein a source electrode and a gate electrode are formed on a main surface of the chip, and the second source electrode is connected to a ground-side plate lead portion. The ground-side plate lead portion and gate-side lead portions connected to the gate electrodes, respectively, are provided between the input-side plate lead portion and the output-side plate lead portion. In this manner, heat-dissipation paths via wirings when the 2-in-1 package is mounted on a board can be wide.10-28-2010
20100270986HIGH EFFICIENCY POWER CONVERTER, AND MODULATOR ANDTRANSMITTER USING IT - A power converter is described adapted to be connected to an electrical power source, in particular a voltage source (V10-28-2010
20090160412METHODS AND SYSTEMS FOR CONTROL OF SWITCHES IN POWER REGULATORS/POWER AMPLIFIERS - Systems and methods for controlling timing of switches in power regulator/power amplifiers.06-25-2009
20090179624RV CONVERTER WITH CURRENT MODE AND VOLTAGE MODE SWITCHING - A switched mode converter is disclosed that includes both voltage mode and current mode control. The switched mode converter also includes mode logic for switching between a voltage mode and a current mode. The converter includes current sensing circuitry for sensing the switcher current on the primary side of the transformer and the load current on the secondary side as well as voltage sensing circuitry for sensing the converter output voltage. When the load current is less than a predetermined value, the converter operates in a voltage mode. During the voltage mode, the output voltage of the voltage mode controller is used to control the duty cycle of a pulse width modulation (PWM) controller. When the load current is greater than a predetermined value, the converter operates in a current mode. In a current mode, the primary switcher current is used to control the PWM controller. As such, during a light load in which the converter is voltage controlled, there is no need for a minimum load to stabilize the control loop. In a current-mode, the control loop will have a relatively faster transient response and avoid flux imbalance in push-pull topology. As such, the converter provides the advantages of both known voltage controlled and current controlled switched mode converters. In addition, by the careful arrangement of the locations of a EMC filter, a primary heat sink, a secondary heat sink, a power transformer T1 and other power devices as well as a cooling fan, a smaller EMC filter can be used due to the primary heat sink performing a dual function of thermal management and additionally providing EMC shielding to prevent the noise, for example, the noise generated by the transformer, from reaching the filter. In addition, the primary heat sink is configured to face the air flow while the secondary heat sink is placed close to the fan with its fin direction the same as the direction of the air flow. As such, both the primary and the secondary heat sink get maximum air flow, allowing smaller heat sinks to be used in order to provide a reliable and cost-effective switched mode converter.07-16-2009
20090179623METHOD OF CONTROLLING DC/DC CONVERTER APPARATUS - If a lower arm device connection period is non-zero in a previous switching cycle, a first dead time is prohibited from decreasing, and if the lower arm device connection period is zero, the first dead time is allowed to decrease, wherein the first dead time is the dead time provided after the lower arm device connection period in the previous switching cycle but before an upper arm device connection period in the current switching cycle.07-16-2009
20090160413METHOD AND ARRANGEMENT FOR THE POWER SUPPLY OF AN INDUCTION HEATING DEVICE - In order to increase the power of an induction heating device or in order to avoid system reactions when driving the latter, either the pulse widths of the two switching means can be made unsymmetrical in the case of half-bridge driving up to the half-point of a half-cycle. Alternatively, a dead time between the pulse width can be extended. This advantageously takes place without interruption and continuously. In the course of a half-cycle, the power is thus reduced given an unaltered operating frequency and an inductor current has virtually an ideal sine-wave form.06-25-2009
20090128112DUTY-CYCLE INDEPENDENT CURRENT LIMIT FOR A POWER REGULATOR - One embodiment of the invention includes a power regulator system. The system comprises an error amplifier that provides an error voltage based on a comparison of a reference voltage and a feedback voltage associated with an output voltage of the power regulator system. The system also comprises a pulse-width modulation (PWM) comparator configured to generate a switching signal that controls activation and deactivation of at least one power switch. The PWM comparator defining a duty-cycle of the switching signal based on the error voltage. The system further comprises a current limit circuit configured to clamp the error voltage upon the error voltage exceeding a voltage limit having a magnitude that varies as a function of the duty-cycle to provide a predetermined current limit that is substantially fixed independent of the duty-cycle.05-21-2009
20090128109DC/DC Converter with Dynamic Offset Compensation - The present invention provides a DC/DC up-converter (05-21-2009
20090184698Switching power supply - A switching power supply exhibits high conversion efficiency and facilitates reducing the size thereof. The switching power supply includes a half-bridge circuit including a first series circuit formed of switching devices Q07-23-2009
20090184699POWER SUPPLY APPARATUS AND POWER SUPPLY METHOD - A power supply apparatus is described that includes a first switch, a second switch, a first comparator, a signal generator and a controller. The first switch is provided between an inductor and a terminal having a reference voltage. The second switch is provided between the inductor and an output terminal. The first comparator compares an input voltage and a first comparison voltage. The signal generator outputs a frequency signal based on an output of the first comparator. The first controller controls current flowing into the inductor by controlling the first switch and the second switch based on the output of the signal generator.07-23-2009
20090027022CHARGE PUMP CIRCUIT, AND CONTROL CIRCUIT AND CONTROL METHOD THEREOF - A first switch group includes switches provided on a path for charging a flying capacitor using an input voltage. A second switch group includes switches provided on a path for charging an output capacitor using charge stored in the flying capacitor. A pulse modulator generates a pulse signal having a duty ratio adjusted so that a feedback voltage corresponding to an output voltage of a charge pump circuit matches a given reference voltage. A driver receives the pulse signal from the pulse modulator, and turns on either one of the first switch group and the second switch group during a period corresponding to a high-time of the pulse signal and turns on the other switch group during a period corresponding to a low-time thereof.01-29-2009
20090015224DC-DC CONVERTER, DRIVER IC, AND SYSTEM IN PACKAGE - A DC-DC converter that prevents self turn-on and improves the power efficiency is provided. In a non-insulated DC-DC converter, self turn-on is prevented by applying a negative voltage between a gate and a source of a low side MOSFET by the use of a capacitor for generating negative voltage when the low side MOSFET is in an OFF state. Also, when the low side MOSFET is in an ON state due to the capacitor for generating negative voltage, a positive voltage applied between the gate and the source of the low side MOSFET does not drop from a voltage of a gate driving DC power source that is supplied from a gate power input terminal. Therefore, the power efficiency is improved.01-15-2009
20090206810SWITCHED MODE POWER SUPPLY HAVING IMPROVED TRANSIENT RESPONSE - A switched mode power supply has a high side switching transistor coupled between a voltage source and a load for generating the output voltage at the load. A driver circuit drives the high side switching transistor. A first resistor divider is coupled to the output voltage and has a first tap. An error amplifier has a first input coupled to the first tap and a compensated feedback loop. A second resistor divider is coupled to the output voltage and has a second tap, resistance of the second resistor divider being less than resistance of the first resistor divider. A switch is coupled to the second tap and to the first input of the error amplifier for connecting the second tap to the first input of the error amplifier when the output voltage of the switched mode power supply reaches a first predetermined voltage.08-20-2009
20090206811CURRENT LIMITED VOLTAGE SOURCE WITH WIDE INPUT CURRENT RANGE - An integrated electronic device includes circuitry for providing a regulated output supply voltage level at an output node from an adjustable current. The circuitry includes an adjustable current source for providing the adjustable current and for adjusting the adjustable current to a magnitude of a target value in response to a configuration signal, an auxiliary adjustable current source providing an auxiliary adjustable current having a magnitude corresponding to the target value, and an output supply voltage level regulating loop coupled to the output node and adapted to keep the output supply voltage level at a preset value. A current selecting stage is adapted to receive the adjustable current and the auxiliary current. The current selecting stage is further adapted to supply a selected current corresponding to a lesser value of the adjustable current and the auxiliary adjustable current. Further, a current limiting stage is coupled to the output node for limiting the selected current to a predefined magnitude.08-20-2009
20110221411SEMICONDUCTOR MEMORY DEVICE AND METHOD FOR OPERATING THE SAME - A semiconductor memory device includes a voltage detector configured to detect a level of an external power supply voltage and an internal voltage generator configured to generate an internal voltage in response to an active signal and drive an internal voltage terminal with a driving ability corresponding to an output signal of the voltage detector. A method for operating the semiconductor memory device includes detecting a level of an external power supply voltage, based on a first target level, to output a detection signal; and generating an internal voltage in response to an active signal, and driving an internal voltage terminal with a driving ability corresponding to the detection signal.09-15-2011
20100127679FAULT TOLERANT REDUNDANT CLOCK CIRCUIT - A clock generation circuit, includes, in part, a comparator, a logic unit, and a switching circuit. The switching circuit generates a signal that is applied to the comparator. If the input voltage level of the signal applied to the comparator is greater than a first reference voltage, the comparator asserts its first output signals. If the input voltage level of the signal applied to the comparator is less than a second reference voltage, the comparator asserts its second output signal. The output signals of the comparator form a first pair of feedback signals applied to the switching circuit. The logic unit responds to the output signals of the comparator to generate a second pair of oscillating feedback signals that are also applied to the switching circuit. The switching circuit varies a capacitor voltage in response to a reference current and in response to the two pairs of feedback signals it receives.05-27-2010
20110140678Current limit recovery circuit - The present invention provides a synchronous buck switcher including a first loop, second loop, a current limit switch, a capacitor and an RS flip flop. The first loop includes an error amplifier (EA), a pulse width modulator (PWM), a PMOS device and an NMOS device. The second loop includes a second capacitor and a resistor connected between the output terminal of the EA and an input terminal of the EA. During a current limit event, a current limit pulse is applied to the current limit switch which allows the input voltage at the inverting terminal of the EA to follow the decreasing output voltage due to the current limit event. As a result, regulation occurs at this lower voltage at the inverting input of the EA. The inverting input of the EA is then charged back to the original reference voltage, resulting in a smooth recovery from current limit.06-16-2011
20090243574INTERNAL COMBUSTION ENGINE CONTROLLER - An internal combustion engine controller comprises a booster coil connected to a battery and a booster capacitor. A switch element is connected to the booster coil to control the passage of current through the booster coil and an interruption of the current. The booster capacitor accumulates electrical energy generated with an inductance of the booster coil at the time of the interruption of the passage of the current. A booster control circuit carries out control in a constant boost switching cycle so as to pass the current through the booster coil and the switch element until the current reaches a preset switching stop threshold value and then interrupt the current to charge the energy generated with the inductance of the booster coil into the booster capacitor. The booster control circuit is configured to ensure a minimum time period for the booster capacitor-charging of the energy within the boost switching cycle.10-01-2009
20110227548POWER SUPPLY APPARATUS - A power supply apparatus is provided. The power supply apparatus includes two power suppliers coupled in parallel so as to simultaneously supply the electric power required by an electronic product in operation. The power supply apparatus provided by the invention may stably/accurately output the desired DC output voltage to the electronic product, and may further in advance increase a main power generated inside the other power supplier when one of the power suppliers is over voltage, thereby avoiding an oversized voltage drop from occurring in the DC output voltage.09-22-2011
20090201001SAMPLED DATA ANALOG CIRCUITS FOR INTEGRATED COMPENSATION OF SWITCH MODE POWER SUPPLIES - A switching mode power supply utilizing an analog sampled data system in the feedback control loop in which the coefficients of the sampled data system are change by reprogramming a programmable nonvolatile memory when external LC values vary.08-13-2009
20090085539FEEDBACK AND COMPARISON APPARATUS AND DC-DC VOLTAGE CONVERTER - A feedback and comparison apparatus applicable to a DC-DC voltage converter is provided. The feedback and comparison apparatus includes a comparator and a voltage feedback circuit. The voltage feedback circuit includes a first voltage dividing component and a second voltage dividing component. The comparator compares a feedback voltage with a first reference voltage, and outputs a control signal to the DC-DC voltage converter according to the comparing result. One end of the first voltage dividing component is coupled to an output voltage output by the DC-DC voltage converter and the other end of the first voltage dividing component is coupled to one end of the second voltage dividing component, for providing the feedback voltage. The other end of the second voltage dividing component is coupled to a second reference voltage. The present invention is applicable to a situation that the output voltage is smaller than the reference voltage.04-02-2009
20090189580Drive control apparatus for controlling drive of inductive load and drive control method for controlling the same - A drive control apparatus controls a drive of an inductive load having a current flowing therethrough. The drive control apparatus includes a drive control device for controlling a variation of the current flowing through the inductive load within a certain period by Pulse Width Modulation control so as to come close to a reference current value, and a reference value control device for controlling a fluctuation period of the reference current value and making the fluctuation period of the reference current value longer than that of the current flowing through the inductive load by the Pulse Width Modulation control.07-30-2009
20110227549DC/DC CONVERTER INCLUDING ULTRASONIC FEATURE FOR USE WITH LOW QUIESCENT CURRENTS - A buck voltage converter comprises an upper switching transistor connected between an input voltage node and a phase node. The upper switching transistor turns on and off responsive to a first drive signal. A lower switching transistor is connected between the phase node and ground. The lower switching transistor turns on and off responsive to a second drive signal. An inductor is connected the phase node and an output voltage node. Control circuitry generates the first drive signal and the second drive signal responsive to a feedback voltage monitored at the output voltage node and a phase at the phase node. In a pulse frequency mode voltage of operation the control circuitry turns off the upper switching transistor and turns on the lower switching transistor responsive to a determination that a predetermined period of time has occurred since a detection of a phase switch at the phase node and turns off both the upper switching transistors and the lower switching after the lower switching transistor has been turned on for a second predetermined period of time.09-22-2011
20090096435LAYOUT SCHEMES AND APPARATUS FOR HIGH PERFORMANCE DC-DC OUTPUT STAGE - A layout method that enables a high power switch mode voltage regulator integrated circuit to generate a large output current and achieve substantially low switching loss is disclosed. The layout method includes forming an array of switching elements on a semiconductor die, each switching element including a plurality of discrete transistors configured to have a substantially reduced ON resistance; and forming a plurality of gate driver circuits on the same die among the switching elements, all using a single metal process. Each gate driver circuit placed substantially close to and dedicated to drive only one switching element so that the gate coupling capacitance resistance product is substantially reduced.04-16-2009
20090230934SWITCHED MODE VOLTAGE CONVERTER WITH LOW-CURRENT MODE AND METHODS OF PERFORMING VOLTAGE CONVERSION WITH LOW-CURRENT MODE - A voltage conversion circuit for a host electronic device includes a buck converter circuit having an input terminal coupled to a first node and having an output terminal coupled to a second node, a switched capacitor voltage converter circuit having an input coupled to the first node and an output coupled to the second node. The buck converter circuit may be configured to be selectively enabled and disabled in response to a control signal, and the switched capacitor voltage converter circuit may be configured to operate when the buck converter circuit is disabled.09-17-2009
20120032659POWER SUPPLY DEVICE - A power supply device for transforming a DC input voltage by switching charging/discharging of an inductor, and obtaining a DC output voltage by smoothing the transformed voltage by a capacitor, includes: a transistor for synchronous rectification coupled between the inductor and the capacitor; a current determination circuit for determining whether a current flowing through the transistor is less than a lower-limit current; and a control circuit for operating the transistor in a constant current operation while the current flowing through the transistor is greater than the lower-limit current and operating the transistor in a rectification operation when the current is less than the lower-limit current, based on a determination result of the current determination circuit.02-09-2012
20110109287SEMICONDUCTOR PACKAGE AND DC-DC CONVERTER - According to one embodiment, a semiconductor package includes a chip, a plurality of bumps, a source frame, a drain frame, and a mold member. The chip has a lateral transistor formed inside the chip and has a top source electrode exposed on a first surface of the chip and a top drain electrode exposed on the first surface of the chip. The plurality of bumps are mounted on each of the top source electrode and the top drain electrode. The source frame is connected to the top source electrode through the bumps. The drain frame is connected to the top drain electrode through the bumps. The mold member embeds at least a part of each of the chip, the bumps, the source frame and the drain frame.05-12-2011
20090201002Load Driving Device and Portable Apparatus Utilizing Such Driving Device - A load such as an LED and a constant-current source are connected in series with each other between the node of a dc-dc conversion type power supply circuit providing an output voltage and the ground. The constant-current source provides a constant current Io, the magnitude of which can be adjusted. The power supply circuit controls the output voltage such that the voltage drop across the constant-current source serving as a detection voltage becomes equal to a reference voltage. Thus, the load current can be varied within a predetermined range while avoiding the power loss due to an increase in the load current, thereby always permitting efficient operation of the load.08-13-2009
20090115387VOLTAGE GENERATING CIRCUIT - A voltage generating circuit comprising: a switching device which includes a first end connected to a high potential side power source, and which becomes conductive in a first mode and becomes non-conductive in a second mode; a first transistor including a first main electrode connected to a second end of the switching device, a second main electrode connected to an output terminal, and a gate connected to a gate potential supply node; a second transistor including a first main electrode connected to the high potential side power source, a second main electrode connected to the output terminal, and a gate connected to the gate potential supply node; and a gate voltage stabilizing circuit that suppresses a fluctuation in potential of the potential supply node, the fluctuation accompanying a change between the first and second modes.05-07-2009
20110221410CURRENT INJECTOR CIRCUIT FOR SUPPLYING A LOAD TRANSIENT IN AN INTEGRATED CIRCUIT - A current injector circuit comprises a clock modulating circuit, a first current injector, a feedback circuit, a first input modulating circuit and a second current injector. The clock modulating circuit receives a clock, a control signal, and an output. The first current injector has an input coupled to the clock modulating circuit, and an output coupled to a power supply terminal for providing a first current. The feedback circuit is coupled between the power supply terminal and another input of the clock modulating circuit. The feedback circuit is for providing the control signal for controlling the clock modulating circuit. The first current injector provides the first current in response to the clock modulating circuit. The first input modulating circuit receives an input signal, the control signal, and an output. The second current injector has an input coupled to the first input modulating circuit, and an output for providing a second current.09-15-2011
20090001954SWITCHING POWER SUPPLY - A switching power supply is provided which keeps constant, even when the oscillation frequency of a switching element increases, the on duty of secondary current passing through a secondary winding, thereby achieving a constant current drooping characteristic with high accuracy. To be specific, a secondary current on-period detection circuit generates a signal indicating the off timing of the secondary current, based on a flyback voltage generated on an auxiliary winding. A secondary-current detection delay time correction circuit generates a signal indicating a time when a predetermined period has elapsed since the switching element is turned off. A secondary current on-duty control circuit generates a clock signal for turning on the switching element so as to keep constant the on duty of the secondary current, based on the signal generated by the secondary current on-period detection circuit and the signal generated by the secondary-current detection delay time correction circuit.01-01-2009
20090021231Voltage regulator - Provided is a voltage regulator having satisfactory transient response characteristics. Because a PMOS (01-22-2009
20090021230DRIVING DEVICE AND DISLAY DEVICE INCLUDING THE SAME - A driving voltage circuit for a liquid crystal display and a liquid crystal display using the driving voltage circuit. A liquid crystal display according to the present invention includes a liquid crystal display panel for displaying an image and a driving voltage generating circuit connected to the display panel, wherein the driving voltage generating circuit includes a DC-DC converter for converting an input voltage level of a power input terminal to drive the liquid crystal display panel and outputting it as a liquid crystal driving voltage, a power line for connecting the power input terminal and the DC-DC converter, a first diode connected to a first node of the power line, a liquid crystal driving voltage terminal connected to a first output terminal of the DC-DC converter, and a second diode connected to the first diode and the liquid crystal driving voltage terminal, wherein the power line includes a second node connected to a ground electrode between the first diode and the second diode.01-22-2009
20090212754NOISE REDUCTION SYSTEMS AND METHODS - We describe a switch mode power supply having a power input, a switch, a transformer, and a power output. The transformer has a primary winding coupled to said power input via said switch, and a secondary winding coupled to said power output. The transformer further comprises an auxiliary winding and a coupling structure capacitatively coupled to said secondary winding of said transformer; wherein said coupling structure does not comprise a shield or screen between said primary and secondary windings. The switch mode power supply further comprises a coupling capacitor connected between said coupling structure and said auxiliary winding to provide a noise suppression voltage from said auxiliary winding to said secondary winding to at least partially cancel a common mode noise voltage on said secondary winding from unshielded coupling from said primary winding.08-27-2009
20090251118OUTPUT DEVICE AND ELECTRONIC DEVICE PROVIDED WITH SAME - A switching power supply IC (10-08-2009
20120194154SWITCHING REGULATOR CONTROL CIRCUIT AND SWITCHING REGULATOR - Provided is a switching regulator including an overload protection circuit, which has high accuracy even without requiring adjusting means in a test step. The switching regulator includes: a first triangle wave generation circuit for generating a first triangle wave which controls Duty of a PWM signal; and a second triangle wave generation circuit for generating a second triangle wave for overload detection, which has a crest value smaller than that of the first triangle wave. A ratio between the crest value of the first triangle wave and the crest value of the second triangle wave is set based on respective capacitances or constant currents thereof.08-02-2012
20120194156LOAD DRIVING SIGNAL-LINKED HIGH VOLTAGE DRIVING METHOD AND DRIVING CIRCUIT THEREOF - A load driving signal-linked high voltage driving method comprises the steps of: generating an output power voltage of preset size by boosting the voltage of input power; converting the output power voltage so that the generated output power voltage may be linked with an output signal of a load driving circuit; and driving a load by applying the converted output power voltage to the load driving circuit. According to the above present invention, it is possible to minimize power consumption of a battery in a portable electronic device which drives a load by converting the low-voltage rectification power or a voltage of the battery into a high voltage, and thus the usage of a function or an apparatus such as a haptic terminal or the like, which may need a high voltage, is more activated.08-02-2012
20120194155POWER SUPPLY APPARATUS AND RECORDING APPARATUS - A power supply apparatus that suppresses radiation of noise while supplying a stable voltage, and a method of supplying power are provided. The power supply apparatus includes a power conversion unit configured to input a voltage to convert the voltage into an electric power; and a smoothing unit configured to include a coil, a capacitor, and a cable in which power supply wires connecting one end of the capacitor to the coil and ground wires connecting the other end of the capacitor to a ground of the power conversion unit are alternately arranged, and to smooth the voltage output from the power conversion unit.08-02-2012
20120194153CONSTANT VGS MOS SWITCH WITH CHARGE PUMP - A system comprises a switch circuit including an input and a control connection and a voltage converter circuit electrically coupled to the switch circuit. The voltage converter circuit includes an input electrically coupled to the input of the switch circuit and an output electrically coupled to the control connection of the switch circuit. The output signal generated at the output includes the input signal shifted by a substantially constant voltage amplitude as the voltage of the input signal varies.08-02-2012
20090128110Compact Frequency Compensation Circuit And Method For A Switching Regulator Using External Zero - A compensation circuit in a monolithic switching regulator controller being incorporated in a closed loop feedback system of a switching regulator includes error amplifier having an output terminal with an output impedance and a degeneration resistance terminal coupled to a first terminal of the switching regulator controller. The compensation circuit includes a first resistor and a first capacitor connected in series between the output terminal of the error amplifier and a ground potential. In operation, the first capacitor and the output impedance of the error amplifier operate to introduce a pole and the first resistor and the first capacitor operate to introduce a first zero in the closed loop feedback system. When a second capacitor is coupled to the first terminal of the switching regulator controller, a second zero is introduced in the closed loop feedback system. The second capacitor is an off-chip capacitor formed external to the monolithic switching regulator controller.05-21-2009
20090315527Output current detection of a voltage regulator - For output current detection of a voltage regulator, the currents in a high-side transistor and a low-side transistor of the voltage regulator are sensed and summarized to a summed current to flow through a setting resistor. The voltage variation on the setting resistor is monitored to provide a feedback signal for feedback control in the voltage regulator. This detection scheme removes the current sensing resistor from the charging current path of the voltage regulator to prevent efficiency loss on it, and is much less sensitive to noise interference because greater voltage variation is available by using a greater setting resistor.12-24-2009
20100148737DISCONTINUOUS CONDUCTION MODE PULSE-WIDTH MODULATION - One embodiment of the invention includes a power regulator system. The system includes a switching system configured to generate an output voltage across a load based on a high-side switch coupling a power voltage to an output at an edge-trigger of a PWM control signal having an activation pulse-width of the high-side switch. The system also includes a switch driver system configured to set a duty-cycle of the PWM control signal such that the activation pulse-width of the PWM control signal is based on the power regulator system operating in one of a continuous conduction mode (CCM) and a discontinuous conduction mode (DCM). The edge-trigger of the PWM control signal can occur based on a relative magnitude of the output voltage and the power voltage while operating in the DCM.06-17-2010
20100148738METHOD FOR CHANGING AN OUTPUT VOLTAGE AND CIRCUIT THEREFOR - A power supply and a method for compensating for a droop component in an output signal of the power supply. The power supply may include an error amplifier and an oscillator coupled to a pulse width modulation circuit. Outputs of the pulse width modulation circuit are connected to switching circuits that have outputs coupled to an output node. The power supply further includes a droop compensation circuit connected to the output of the power supply, the outputs of the switching circuits, and to an input of the error amplifier. The droop compensation circuit includes an amplifier coupled to a feed-forward network and a current source coupled to the feed-forward network. The current source sources a current to or sinks a current from the feed-forward network to generate a droop compensation signal that is transmitted to the error amplifier. The current source may be controlled by a digital-to-analog circuit.06-17-2010
20100176776POWER SUPPLY DEVICE - A power supply device is provided with an output transistor for outputting a switch voltage having a rectangular waveform, based on an input signal by being switching-controlled by a pulse width modulation signal; a reference voltage generating circuit for generating a prescribed reference voltage; an error amplifier wherein a feedback voltage depending on the switch voltage and the reference voltage are inputted, an error voltage is generated by amplifying a difference between the voltages, and changes a gain of itself, in accordance with a current signal generated inside based on the feedback voltage and the reference voltage; an oscillator for generating an oscillation signal; and a comparator wherein the oscillation signal and the error voltages are inputted and the pulse width modulation signal is outputted by comparing the voltages.07-15-2010
20100176782SEMICONDUCTOR CIRCUIT AND SWITCHING POWER SUPPLY APPARATUS - To provide a power supply apparatus which realizes a high-speed response, a stable operation, and a low output ripple with low power consumption. The first stage switching regulator receives an input voltage and forms a first voltage. The second stage switching regulator receives the first voltage and forms a second voltage. The second stage switching regulator includes an N-phase (N is two or more) switching regulator, and the first voltage is set to be N times a target value of the second voltage. The input voltage is set to be higher than the first voltage.07-15-2010
20100176780Power supply device and electronic apparatus - A power supply device includes: a power supply connector which receives supply of power and supplies the power to the outside thereof; plural OBPs which apply voltages to supply power, to each of processing devices to perform processing and to include different types of application voltages planned to be applied, and each of the plural OBPs is supplied with power directly or indirectly from the power supply connector; and a power supply control section that increases and decreases supplying power which each of the OBPs supplies to one processing device out of the plural processing devices according to an extent of a processing load in the one processing device as well as according to an extent of a processing load in another processing device whose application voltage is different from that of the one processing device.07-15-2010
20090278519BUS LOOP POWER INTERFACE AND METHOD - A bus loop power interface (11-12-2009
20100156372SWITCHING CONTROL CIRCUIT - A switching control circuit includes an N-channel MOSFET having an input electrode applied with an input voltage and an output electrode connected to one end of an inductor and one end of a rectifying element. The other end of the inductor is connected to a first capacitor. A bootstrap circuit is configured to generate a bootstrap voltage on a second capacitor having one end connected to the output electrode of the N-channel MOSFET. The bootstrap voltage is required when the N-channel MOSFET is turned on. A driving circuit is configured to be applied with a driving voltage corresponding to the bootstrap voltage and turn on/off the N-channel MOSFET to generate an output voltage of a target level on the first capacitor. A clamping circuit is configured to clamp the driving voltage to be at a predetermined level or lower.06-24-2010
20100181980SWITCHING POWER SUPPLY CONTROLLER WITH SELECTIVE FEEDBACK SAMPLING AND WAVEFORM APPROXIMATION - A switching power supply controller which includes at least one switching element, and controls a switching cycle during which the switching elements are switched on and off to regulate the power supply's output voltage. The controller has a feedback signal which represents the output voltage, and a circuit node which conducts a current that is higher during a second portion of the switching cycle than it is during a first portion, such that the feedback signal varies with the current conducted by the node. To overcome feedback signal inaccuracies, a sampling circuit samples a signal which varies with the feedback signal only during the first portion of the switching cycle; the controller then regulates the output voltage in response to the sampled signal. The sampling circuit may be further arranged to produce an output which approximates the portion of the feedback signal waveform which is not sampled.07-22-2010
20080315849Power Converter and Method for Power Conversion - The invention relates to a power converter for converting a first electrical power signal into a second electrical power signal having an output voltage Vout with a DC component comprising a control circuit (12-25-2008
20100156374Power Converter with Power Switch Operable in Controlled Current Mode - A power converter and method of controlling a power switch therein to improve power conversion efficiency at low output current. In one embodiment, the power converter includes a first power switch coupled to a source of electrical power and a second power switch coupled to the first power switch and to an output terminal of the power converter. The power converter also includes a controller configured to alternately enable conduction of the first and the second power switches with a duty cycle in response to an output characteristic of the power converter. The controller is configured to control a level of current in the first power switch when the second power switch is substantially disabled to conduct.06-24-2010
20100156371SINGLE SUPPLY PASS GATE LEVEL CONVERTER FOR MULTIPLE SUPPLY VOLTAGE SYSTEM - The present invention relates to a level converter used in a multiple supply voltage system that is required to design a low-power and high-performance semiconductor, and more particularly, to a single supply pass gate level converter (SPLC) for a multiple supply voltage system, which has low power consumption, operates at high speed, and uses only a single supply voltage. The SPLC includes an input data providing circuit unit which receives an input signal of a low supply voltage; a data inversion circuit unit which receives input data from the input data providing circuit unit and outputs inversed input data; a feedback circuit unit which is fed back by an output of the data inversion circuit unit; and a data output buffer which inverses an output of the data inversion circuit unit and outputs an inversed signal. The input data providing circuit unit, the data inversion circuit unit, the feedback circuit unit, and the data output buffer are all driven by a high supply voltage such that only a single supply voltage which is the high supply voltage is required.06-24-2010
20090284238Re-programmable modular power management circuit - An integrated circuit includes a buck converter controller, a PFET, an NFET that is coupled in common drain configuration to the PFET, a first microbump that is connected to the source of the PFET, a second microbump that is connected to the source of the NFET, a third microbump that is connected to the common drain node, a fourth microbump that is connected to a feedback input lead of the controller, and a plurality of other microbumps.11-19-2009
20100176775VOLTAGE REGULATOR - A voltage regulator includes a comparator, a first voltage output unit, a second voltage output unit, a third voltage output unit, a first switch and a second switch. The voltage regulator receives an operating voltage and a reference voltage generated by a reference voltage generator, and then outputs a corresponding output voltage. The voltage regulator of the present invention can provide an operation mode, a suspend mode and a standby mode and can be switched among these modes to provide corresponding current driving capacity for respective operation states. When in the operation mode, the voltage regulator can supply a great current. When in the suspend mode, the voltage regulator consumes less power. When in the standby mode, the voltage regulator consumes even less power.07-15-2010
20100259239REGULATOR CONTROL CIRCUITS, SWITCHING REGULATORS, SYSTEMS, AND METHODS FOR OPERATING SWITCHING REGULATORS - A regulator control circuit includes a high side driver that is configured to receive a supply voltage. A capacitor is configured to store charges. A first transistor is coupled between the capacitor at a first node and a gate of a high side driver at a second node. The first node is capable of being boosted to a voltage to operate the first transistor at a saturation mode for a charge sharing between the first node and the second node so as to substantially turn on the high side driver.10-14-2010
20100013450POWER SUPPLY AND OVER VOLTAGE PROTECTION APPARATUS AND OVER VOLTAGE PROTECTION METHOD - A power supply, an over voltage protection (OVP) apparatus, and an OVP method are provided. The present invention employs the OVP apparatus for monitoring a core power. When a voltage level of the core power is higher than a reference voltage, the OVP apparatus disables a power supply unit. As such, the present invention is adapted for avoiding damage to a capacitor of a conversion unit or load caused by abnormal boost of the voltage level of the core power.01-21-2010
20100181977SWITCHING REGULATOR AND METHOD FOR CONTROLLING OPERATION THEREOF - A disclosed switching regulator includes: a switching element switching in accordance with an input control signal; an inductor charged with a supply voltage by the switching of the switching element; a rectifying element discharging the inductor when the switching element is switched off and charging of the inductor is stopped; and a control circuit unit generating an error voltage based on a voltage difference between a proportional voltage and a predetermined reference voltage, generating and outputting a pulse signal with a duty cycle in accordance with the error voltage to a control electrode of the switching element. The control circuit unit generates a feedback voltage from the duty cycle of the pulse signal, generates the pulse signal with the duty cycle from a voltage difference between the generated feedback voltage and the error voltage, and varies the voltage difference from the duty cycle of the pulse signal.07-22-2010
20100181978Booster circuit and PWM signal generator - A PWM signal generator used for a booster circuit including a voltage-boosting coil that is connected to a main power supply, and a driving transistor that drives the voltage-boosting coil to generate boosted voltage, the PWM signal generator including a first amplifier that generates intermediate voltage based on a voltage value of the boosted voltage, a triangular wave generator that generates a triangular wave signal, a comparator that compares a voltage level of the intermediate voltage with a voltage level of the triangle wave signal to generate an intermediate PWM signal, a driver that generates a PWM signal supplied to the driving transistor based on the intermediate PWM signal, and a second amplifier that generates a driver power supply supplied to the driver based on magnitude of a voltage value of the intermediate voltage.07-22-2010
20100181975Switching Converter and Method to Control a Switching Converter - Preferred embodiments of the present invention are a switching converter, an integrated circuit package, and method for controlling a switching converter. An embodiment of the invention is a switching converter comprising a first compensation network having a first node coupled to an error voltage and a second node coupled to electrical ground and a second compensation network having an input coupled to the error voltage. A frequency domain transfer function of the first compensation network comprises a first zero and a plurality of first poles, and a frequency domain transfer function of the second compensation network comprises a second zero and a second pole.07-22-2010
20100259237Compensation Circuit - An improved compensation circuit with loop compensation is disclosed. The compensation circuit can get an equivalent large capacitance by amplifying a small capacitor. Hence, the compensation circuit can get a good compensation effect with a minimum chip area, hence lower cost.10-14-2010
20100259238Direct Current Converter - A direct current converter includes a first node, a second node, an input voltage terminal end, an output voltage terminal, a control power terminal, a low-voltage end, a control module for generating a control signal, a driving-stage circuit coupled to the input voltage terminal, the first node, the second node, the control module, and the low-voltage end, an output-stage circuit coupled to the second node and the output voltage terminal, and a bootstrap circuit including a capacitor coupled between the first node and the second node, and a cascade unit coupled to the control power terminal, the first node, and the control module for controlling connection between the control power terminal and the first node according to the control signal.10-14-2010
20100259236Voltage regulator controller frequency varied by load current (61065-R) - In some embodiments, a voltage regulator device may include a variable frequency voltage regulator, a sense circuit coupled to an output of the variable frequency voltage regulator, the sense circuit to sense a signal corresponding to an output condition of the variable frequency voltage regulator, and a frequency adjust circuit coupled between the sense circuit and the variable frequency voltage regulator, the frequency adjust circuit to dynamically adjust an operating frequency of the variable frequency voltage regulator based on the signal sensed by the sense circuit during operation of the variable frequency voltage regulator. For example, the frequency adjust circuit may be configured to adjust the operating frequency of the variable frequency voltage regulator over a range of frequencies for a corresponding range of sensed output conditions. Other embodiments are disclosed and claimed.10-14-2010
20100013452METHODS AND APPARATUS FOR POWER SUPPLY LOAD DUMP COMPENSATION - Methods and apparatus for power supply load dump compensation according to various aspects of the present invention may operate in conjunction with a power stage system, such as a power stage system comprising a bootstrapped driver circuit and a power stage responsive to the driver circuit. The power stage system may further include a load dump compensation circuit connected to the driver circuit, wherein the load dump compensation circuit is configured to remove a bias current generated by the bootstrapped driver circuit. Various aspects of the present invention may be implemented in conjunction with any appropriate power supply, such as a switching regulator, for example a buck converter.01-21-2010
20100013449Regulator and semiconductor device - Disclosed is a regulator including: a differential amplifier having a differential input stage receiving a reference voltage and an output terminal voltage, a push-pull type output portion of a current mirror configuration, a drive transistor having a control terminal connected to an output portion of the differential amplifier, first and second transistors cascode-connected between a control terminal of the drive transistor and a power supply, and third and fourth transistors cascode-connected between the control terminal of the drive transistor and ground. Control terminals of the first and the third transistors are respectively connected to control terminals of the push-pull transistors, control terminals of the second and fourth transistors are respectively connected to a first and a second control signal. A voltage of the control terminal of the drive transistor is controlled, based on the first and the second control signals, by output of the differential amplifier and the first transistor, or by output of the differential amplifier and the third transistor.01-21-2010
20090045792Power supply device and image forming apparatus - A charging unit charges a capacitor that is configured to be charged and discharged to drive a load. A switching unit switches on and off between the capacitor and the charging unit. A delay control unit delays an output of a switching control signal for controlling the switching unit until an output voltage of the charging unit exceeds a voltage of the capacitor, and outputs a delayed switching control signal. An output unit receives the delayed switching control signal from the delay control unit, and outputs the delayed switching control signal to the switching unit so that the charging unit charges the capacitor.02-19-2009
20100181974VOLTAGE REGULATORS - An electronic circuit is provided. An error amplifier comprises a first input terminal coupled to a reference voltage, a second input terminal coupled to a feedback voltage, and a transistor comprises a first terminal coupled to an input voltage, a control terminal coupled to an output terminal of the error amplifier and a second terminal outputting an output voltage. A switching-capacitor circuit is coupled between the output voltage and the error amplifier and comprises a plurality of switching elements and at least first and second capacitors. The switching elements are switched by non-overlapping clocks such that the second capacitor is discharged to a bias voltage during a first period, and the first and second capacitors are connected together during a second period thereby extracting a division voltage from the output voltage to serve as the feedback voltage.07-22-2010
20100176781Power supply device and electronic apparatus - A power supply device includes: a first supply section that supplies power in accordance with an extent of a load in processing in a processing device by applying a voltage to the processing device which processes data; and a second supply section that supplies, to the processing device, power smaller than the supplying power by the first supply section, in accordance with an extent of a load in processing in the processing device to increase and decrease a voltage with respect to the application voltage by the first supply section.07-15-2010
20100181976MULTI-PHASE DRIVING CIRCUIT - A multi-phase driving circuit includes a single-phase pulse-width modulation (PWM) controller, a number of drivers, and a number of switch circuits connected to the number of drivers correspondingly. The single-phase PWM controller is configured for providing a single-phase PWM signal. Each of the number of drivers receives the single-phase PWM signal and adjusts a phase of the single-phase PWM signal to output an adjusted PWM signal. Each of the number of drivers also outputs a driving signal. Each of the number of switch circuits receives the adjusted PWM signal and the driving signal from a driver. Each of the number of switch circuits generates a driving voltage controlled by the driving signal and adjusts a phase of the driving voltage controlled by the adjusted PWM signal and then outputs the adjusted driving voltage, so as to make the number of switch circuits output a multi-phase driving voltage to a load.07-22-2010
20100181979DC/DC converter circuit - A DC/DC converter circuit including a boosting circuit which includes: a first capacitance (FC); a first switch (FS), one end of FS connected to a first terminal of FC, and another end of FS connected to a first power supply; a second switch (SS), one end of SS connected to a second terminal of FC, and another end of SS connected to a second power supply; a third switch (TS), one end of TS connected to the first terminal of FC, and another end of TS connected to an output terminal; an amplifier, an output of the amplifier electrically connected to the second terminal of FC; and a voltage-dividing resistor that generates a feedback voltage to be provided to amplifier, and connected to the first terminal of FC.07-22-2010
20100001701CIRCUIT WITH ONE OR MORE DEPLETION MODE TRANSISTORS - An H-bridge circuit formed from two sub-circuits coupled to each other by a load network across a respective load node of each of the sub-circuits. Each sub-circuit of the two sub-circuits comprises a depletion mode upper transistor with a second electrode coupled to a first electrode of a lower transistor. The load node of the sub-circuit is disposed between the second electrode of the upper transistor and the first electrode of a lower transistor. There is a first voltage supply node coupled to a first electrode of the upper transistor and a second voltage supply node is coupled to a second electrode of the lower transistor. An upper driver transistor selectively couples a gate electrode of the upper transistor to an upper drive voltage node, the upper driver transistor having a control electrode coupled to an upper switched voltage supply circuit. There is also a lower switched voltage supply circuit coupled to a gate electrode of the lower transistor and a voltage dependent non-linear resistor is coupled across the gate electrode and second electrode of the upper transistor. In use, when the lower transistor and upper driver transistor are in a non-conductive state a potential difference across the voltage dependent non-linear resistor is sufficiently small enough to control the upper transistor into a conductive state. Conversely, when the lower transistor and upper driver transistor are in a conductive state the potential difference across the voltage dependent non-linear resistor provides a negative bias to the gate electrode of the upper transistor that has a negative potential sufficient to control the upper transistor into a non-conductive state.01-07-2010
20100176778AUTOMATIC VOLTAGE-IDENTIFYING POWER SUPPLY DEVICE AND METHOD THEREOF - An automatic voltage-identifying power supply device has a control module, a voltage regulation circuit, a current load measuring circuit electrically connected with an external post-stage power-receiving device, a power supply circuit and a pre-stage power supply device. After the post-stage power-receiving device is electrically connected with the current load measuring circuit, the control module can control the voltage regulation circuit to output a test voltage signal to the post-stage power-receiving device so that the test voltage signal is altered according to a preset sequence (e.g. progressively increasing) and the current load measuring circuit measures a response current signal of the post-stage power-receiving device corresponding to the test voltage signal. When a variation of the response current signal or a power variation is stable, the control module sets up the stable test voltage signal as an input voltage to the post-stage power-receiving device.07-15-2010
20100277145SYSTEM FOR ACCOUNTING FOR SWITCH IMPENDANCES - A Universal Serial Bus (USB) switch matrix is provided. The switch matrix generally comprises a switch network, and amplifier, a adjustable current source, and variable resistors. The switch network is able to output a differential output signal and a common mode signal. The amplifier compares the common mode signal to a reference voltage, and the amplifier adjusts the magnitude of the current from the adjustable current source and the resistances of the variable resistors based at least in part on the comparison to adjust the peak-to-peak voltage swing of the output signal.11-04-2010
20100277147Switching power supply circuitry - An output voltage VC obtained by boosting an input voltage VIN by means of a charge pump control circuit 11-04-2010
20100237843SWITCHED-MODE POWER SUPPLY - A switched-mode converter including a first magnetic circuit including a first inductive element, coupled to at least one second inductive element and electrically in series with this second element and with a first diode between a first one of two input terminals and a first one of two output terminals; a first switch in series with a third inductive element between a second terminal of the first inductive element and a second input terminal, a common node between the first switch and the third inductive element being connected to one of the output terminals by a second diode; and a circuit capable of canceling the voltage across this first switch before its turning-on.09-23-2010
20100237841POWER SUPPLY AND POWER CONTROL DEVICE - A power supply includes a first switch and a second switch coupled in series between an input voltage terminal to which an input voltage is applied and a reference voltage terminal to which a reference voltage lower than the input voltage is applied, an inductor disposed between a junction coupling the first and second switches and an output terminal from which an output voltage is output, and a controller controlling the first and second switches to be alternately switched at a given switching cycle depending on an error of the output voltage with respect to a target voltage, wherein the controller changes the switching cycle from a first cycle to a second cycle longer than the first cycle, depending on a voltage at the junction when the second switch is in a turned-on state.09-23-2010
20100225289TWO-STAGE SWITCHING POWER SUPPLY - A two-stage switching power supply includes a first-stage power circuit, a second-stage power circuit, an output detecting circuit and a power control unit. The first-stage power circuit includes a first switching circuit. By conducting or shutting off the first switching circuit, an input voltage is converted into a bus voltage. The second-stage power circuit includes a second switching circuit. By conducting or shutting off the second switching circuit, the bus voltage is converted into an output voltage. The output detecting circuit generates an output detecting signal according to the output voltage. The power control unit controls operations of the first and second switching circuits according to the output detecting signal. A first-stage voltage gain value of the first-stage power circuit and a second-stage voltage gain value of the second-stage power circuit are altered with the output detecting signal, so that the output voltage is maintained at a rated value.09-09-2010
20100253302POWER SUPPY CIRCUIT - The invention relates to a power supply circuit (10-07-2010
20100225288Multi-phase power converter and control circuit and method thereof - The present invention discloses a multi-phase power converter, and a control circuit and a control method of the multi-phase power converter. The multi-phase power converter comprises multiple power conversion phases. The method comprises: determining whether to enter a phase-shedding mode; at a first time when entering the phase-shedding mode, disabling at least one of the power conversion phases; and at another time when entering the phase-shedding mode, disabling at least another one of the power conversion phases.09-09-2010
20120139516Power supply circuit with adaptive input selection and method for power supply - The present invention discloses a power supply circuit with adaptive input selection and a method for power supply. The power supply circuit includes: a charge pump for receiving at least one voltage and generating a boosted voltage; a first buck switching regulator coupled to a battery, for operating at least one first power transistor to convert a battery voltage to an output voltage according to a first control signal; a second buck switching regulator coupled to the charge pump, for operating at least one second power transistor to convert the boosted voltage to the output voltage according to a second control signal; and a controller generating the first control signal or the second control signal according to a level of the voltage of the battery, to select the first buck switching regulator or the second switching regulator for generating the output voltage.06-07-2012
20120139515POWER SUPPLY APPARATUS AND POWER SUPPLY SYSTEM WITH PLURAL POWER SUPPLY APPARATUSES - A power supply apparatus includes a front-stage power circuit, a bus capacitor, a standby power circuit, a standby power circuit, an auxiliary switching circuit and a controlling unit. The auxiliary switching circuit is electrically connected between the bus capacitor and the standby power circuit. The controlling unit is electrically connected with the auxiliary switching circuit and the front-stage power circuit for controlling operations of the front-stage power circuit and the auxiliary switching circuit. When the input voltage is normal but the front-stage power circuit is disabled, the auxiliary switching circuit is turned off under control of the controlling unit, so that electric energy of the input voltage is transmitted to an input terminal of the standby power circuit through the protecting circuit.06-07-2012
20100237842SWITCHING CIRCUIT - A switching circuit includes: a switching section including at least one first terminal, a plurality of second terminals, and a switching element configured to connect the first terminal to one of the second terminals; a driver driving the switching element in accordance with an external terminal switching control signal; a DC-to-DC converter, which supplies electric power to the driver, having a first state with a response to a load transient and a second state with the response to a load transient being slower than the first state; and a power controller controlling the DC-to-DC converter to operate with the first state during a first time period corresponding to change in the external terminal switching control signal, and to operate with the second state during a second time period other than the first time period.09-23-2010
20100156373Voltage regulator - Provided is a voltage regulator capable of performing a stable circuit operation while improving undershoot characteristics thereof. When an undershoot has occurred in an output voltage (VOUT), an undershoot improvement circuit (06-24-2010
20100231185POWER SUPPLY DEVICE AND POWER CONVERSION ASSEMBLY THEREOF - A power conversion assembly includes a conversion box, a conversion lead and a plurality of adapter plugs. The conversion box has a power regulation circuit, a variable switch, a power input port, a power output port and at least a interface port. The variable switch, the power input port, the power output port and the at least one interface port are connected with the power regulation circuit. When the conversion box is connected with the power adapter to obtain a DC power, a DC power with a different voltage can be sent out by the switching of the variable switch and the regulation of the power regulation circuit. One end of the conversion lead is used to receive the regulated DC power from the conversion box. The other end of the conversion lead can be replaced with the adapter plug having different specification to supply power to different power-requiring equipment.09-16-2010
20110175584SWITCH-MODE POWER SUPPLY HAVING REDUCED AUDIBLE NOISE - A power supply having an input and an output, includes a power converter coupled between the input and output of the power supply including at least one switch that is controlled by comparing a sensed voltage, the sensed voltage corresponding to a current flowing through the switch, to a reference voltage. A controller, in response to a change detected in a switching frequency of the switch, reduces audible noise generated by the power supply by at least one of: adjusting the reference voltage; adjusting the current sense voltage; or adjusting a resistance used to generate the sensed voltage.07-21-2011
20100253305SWITCHING POWER CONVERTER CONTROL WITH SPREAD SPECTRUM BASED ELECTROMAGNETIC INTERFERENCE REDUCTION - Power control systems generate electromagnetic interference (EMI). In at least one embodiment, a power control system includes a switching power converter and a controller that utilizes a spread spectrum strategy to reduce peak EMI values of the power control system. The controller generates a power regulation, switch control signal to control an input voltage to output voltage conversion by the switching power converter. The controller modulates the period of the control signal in accordance with the spread spectrum strategy. The spread spectrum strategy is an intentional plan to spread the spectrum of the control signal to reduce peak EMI values, and, thus, reduce the potential for degradation in performance, a malfunction, or failure of an electronic circuit caused by the EMI. The controller also modulates a pulse width of the switch control signal in response to modulation of the period of the control signal to provide power factor correction.10-07-2010
20090251119Three chip package - A multi-chip package that includes two power semiconductor devices coupled in a half-bridge arrangement and a driver for driving the two power semiconductor devices.10-08-2009
20100127680PWM VOLTAGE CONVERTER WITH TRANSIENT AND PERMANENT FAULT IMMUNITY THROUGH REDUNDANCY AND FEEDBACK ADJUSTMENT - A pulse-width modulated (PWM) DC-DC converter has a multitude of redundant channels supplying PWM signals to a voter whose output voltage controls the regulated DC output voltage. To ensure that single transient events, single permanent faults, or mismatches in the electrical characteristics of the various components disposed in the redundant channels do not adversely affect the regulated DC output voltage, transitions of the PWM signal in each channel are compared to the corresponding transitions of the voter's output signal. If a PWM signal transition of a redundant channel is detected as occurring relatively earlier/later than the corresponding transition of the voter's output signal, the width of the PWM signal is increased/decreased. If a PWM signal transition of a redundant channel is detected as occurring within a predefined window of the corresponding transition of the voter's output signal, the width of the PWM signal is not changed.05-27-2010
20100244792TWO-PHASE TRANSFORMER-COUPLED BOOST CONVERTER - Various embodiments provide two-phase boost converters. One two-phase boost converter includes a node configured to be coupled to an input voltage and a transformer coupled to the node. The transformer includes primary and secondary windings, an inductor coupled in series with the primary winding, and an inductor coupled in series with the secondary winding. Another two-phase boost converter includes an inductor configured to be coupled to an input voltage, a node coupled to the inductor, and a transformer coupled to the node. The transformer includes primary and secondary windings, an inductor coupled in series with the primary winding, and an inductor coupled in series with the secondary winding. Yet another two-phase boost converter includes a transformer coupled to first and second external inductors. The transformer includes primary and secondary windings, an inductor coupled in series with the primary winding, and an inductor coupled in series with the secondary winding.09-30-2010
20110101946VOLTAGE CONVERTERS - Various aspects can be implemented to achieve efficient voltage conversion. In general, one aspect can be a switching regulator for DC-DC step-down voltage conversion that includes a high-side transistor and a low-side transistor coupled in series and a first circuitry configured to operate in a synchronous mode such that the high-side transistor and the low-side transistor are used for voltage switching. The switching regulator also includes a second circuitry configured to operate in a non-synchronous mode such that the high-side transistor and one or more diodes are used for voltage switching. The switching regulator further includes an automatic mode selector configured to output a control signal and automatically select between the synchronous mode of operation and the non-synchronous mode synchronous mode of operation based in part on a voltage between source and drain of the low-side transistor and a predetermined delay time.05-05-2011
20100253300Voltage mode push-pull driver output stage - There is provided a voltage mode push-pull driver output stage with low power consumption and improved output return loss (ORL) suitable for various high bandwidth data transmission applications. By structuring the output stage to have tunable resistances adjustable by voltages applied to transistors, the output stage is readily adaptable to different applications requiring different resistances or impedance matching.10-07-2010
20100253299LDO regulator and semiconductor device including the same - In a low drop out (LDO) regulator and a semiconductor device including the LDO regulator, the LDO regulator regulates a power supply voltage and applies the regulated power supply voltage to a load. The LDO regulator comprises: an output node connected to the load; a pass transistor that applies a power supply voltage to the output node; and a controller that generates a load enable signal enabling the load by delaying a regulator enable signal by a first delay time, and that increases a gate voltage of the pass transistor after receiving the regulator enable signal to thereby reduce a current flowing through the pass transistor.10-07-2010
20100253306DC/DC CONVERTER - In a non-isolated DC/DC converter, a reference potential for a low-side pre-driver which drives a gate of a low-side MOSFET is applied from a portion except for a main circuit passing through a high-side MOSFET and the low-side MOSFET so that a parasitic inductance between a source of the low-side MOSFET and the pre-driver is increased without increasing the sum of parasitic inductances in the main circuit and negative potential driving of the gate of the low-side MOSFET can be performed and a self turn-on phenomenon can be prevented without adding any member and changing drive system.10-07-2010
20100253303VOLTAGE REGULATOR WITH HIGH ACCURACY AND HIGH POWER SUPPLY REJECTION RATIO - A voltage regulator circuit with high accuracy and Power Supply Rejection Ratio (PSRR) is provided. In one embodiment, an op-amp with a voltage reference input to an inverting input has the first output connected to a PMOS transistor's gate. The PMOS transistor's source and drain are each connected to the power supply and the voltage regulator output. The voltage regulator output is connected to an NMOS transistor biased in saturation mode and a series of two resistors. The non-inverting input of the op-amp is connected in between the two resistors for the first feedback loop. The op-amp's second output is connected to the gate of the NMOS transistor through an AC-coupling capacitor for the second feedback loop. The op-amp's first output can be connected to the power supply voltage through a capacitor to further improve high frequency PSRR. In another embodiment, the role of PMOS and NMOS transistors is reversed.10-07-2010
20100244793AVERAGE INDUCTOR CURRENT MODE SWITCHING CONVERTERS - An average current mode switching converter is described for providing a regulated output current independent of load conditions, and a regulated output voltage as a function of the load connected to the converter. The converter comprises: an inductor; a modulator configured to provide a regulated current through the inductor; a feed back loop coupled between the inductor and the modulator for regulating the current through the inductor; and a precharger configured and arranged so as to provide and maintain a preset minimum current through the inductor independent of the load so as to improve the recovery time of the converter from a step in the desired regulated output current. Also disclosed is a method of providing a regulated output current independent of load conditions at the output of an average current mode switching converter, and a regulated output voltage as a function of the load connected to the output of converter. The method comprises: providing a regulated current through an inductor; and regulating the current through the inductor independent of the load so that a minimum current flows through the inductor so as to improve the recovery time of the converter from a step in the desired regulated output current.09-30-2010
20110057635Switching regulator - A switching regulator includes a switch circuit that delivers a power from a power supply side to an output side, and a smoothing circuit that smoothes the voltage on the output side. The switching regulator also includes an on/off control circuit that controls the on/off of the switch circuit, as the duty ratio is changed depending on the value of the output voltage, so that the output voltage will be equal to a preset voltage. The switching regulator further includes an on-resistance control circuit that exercises control to increase the on-resistance of the switch circuit when the output voltage is lower by not less than a predetermined voltage than the preset voltage.03-10-2011
20110057634SWITCHING POWER SUPPLY DEVICE AND SEMICONDUCTOR DEVICE USED FOR THE SAME - In a switching power supply device in which an operation reference voltage of a control circuit has an electric potential identical to that of a connection point between a switching element and a coil that is an energy conversion circuit, an output voltage detection circuit includes: a rectification circuit which converts an output voltage into a voltage signal rectified relative to the operation reference voltage terminal of the control circuit; and a voltage-to-current converter which is connected between an input terminal of a current detection circuit and the rectification circuit, and which converts the rectified voltage signal into a current signal. The current detection circuit is a sampling type which detects a current by sampling the current signal applied to the input terminal of the current detection circuit.03-10-2011
20100141229Semiconductor Device - The present invention provides a non-insulated type DC-DC converter having a circuit in which a power MOS·FET for a high side switch and a power MOS·FET for a low side switch are connected in series. In the non-insulated type DC-DC converter, the power transistor for the high side switch, the power transistor for the low side switch, and driver circuits that drive these are respectively constituted by different semiconductor chips. The three semiconductor chips are accommodated in one package, and the semiconductor chip including the power transistor for the high side switch, and the semiconductor chip including the driver circuits are disposed so as to approach each other.06-10-2010
20100141227STEP-DOWN CONVERTER AND POWER SUPPLY - A step-down converter is provided. The step-down converter includes a DC-DC converter including a boost capacitor and an NMOS transistor, the DC-DC converter converting an input direct current (DC) voltage to an output DC voltage; and an electric discharge circuit which adjusts the output voltage to be less than or equal to the input voltage.06-10-2010
20100141225ACTIVE PULSE POSITIONING MODULATOR - An adaptive pulse positioning modulator including a sense circuit which provides a compensation signal indicative of output voltage error, a filter circuit having an input receiving the compensation signal and an output providing an adjust signal, a leading ramp circuit which provides a repetitive first leading edge ramp signal having a slope which is adjusted by the adjust signal, a comparator circuit which provides a first start trigger signal when the first leading edge ramp signal reaches the compensation signal and a first end trigger signal when a first trailing edge ramp signal reaches the compensation signal, a trailing ramp circuit which initiates ramping of the first trailing edge ramp signal when the first start trigger signal is provided, and a pulse control logic which asserts pulses on a PWM signal based on the trigger signals.06-10-2010
20100164453CURRENT MODE DC-DC CONVERTER - A voltage regulator uses a comparing apparatus having hysteresis characteristics. The voltage regulator includes a comparator for comparing a comparison voltage with a reference voltage, and outputs a result of the comparison; a switching controller for generating a plurality of switching signals in response to the comparison result; resistors connected in the form of a string, to divide the comparison voltage into a plurality of voltages; and a switching box for selecting one of the plural voltages, as the comparison voltage, in response to the switching signals.07-01-2010
20100164451Voltage Regulator and Method for Voltage Regulation - A voltage regulator, comprising: an input terminal; an output terminal at which an output voltage is provided; an output transistor which couples the input terminal of the voltage regulator to the output terminal of the voltage regulator; and a transimpedance amplifier including an input terminal which is coupled to the output terminal of the voltage regulator and an output terminal which is coupled to a control terminal of the output transistor, optionally via a coupling, the coupling having an impedance value between the output terminal of the transimpedance amplifier and the control terminal of the output transistor which at a given frequency is smaller than or equal to an impedance value of an output impedance of the transimpedance amplifier. The transimpedance amplifier comprises an amplifier including an input terminal which is coupled to the input terminal of the transimpedance amplifier, and an output terminal which is coupled to the output terminal of the transimpedance amplifier, and wherein the transimpedance amplifier further comprises a first impedance which couples the output terminal of the transimpedance amplifier to the input terminal of the transimpedance amplifier and which comprises a first resistor with a first terminal which is connected to a first terminal of the first impedance, a second resistor with a first terminal which is connected to a second terminal of the first resistor and a second terminal which is connected to the second terminal of the first impedance, and a first capacitor which couples the second terminal of the first resistor to the input terminal of the voltage regulator.07-01-2010
20120139514SWITCH-MODE POWER SUPPLY WITH ENHANCED CURRENT SOURCE CAPABILITY - A switch-mode power supply includes an input port, an output port, and a power train operably connected to the input port and the output port. The power train includes at least one inductor and at least one switching device. The switch-mode power supply further includes a control logic configured to periodically calculate a current equivalent to current through the at least one inductor and further configured to control operation of the power train at least in part by switching the at least one switching device based on the calculated current.06-07-2012
20100219800SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE - Efficient reduction in power consumption is achieved by combinational implementation of a power cutoff circuit technique using power supply switch control and a DVFS technique for low power consumption. A power supply switch section fed with power supply voltage, a circuit block in which a power cutoff is performed by the power supply switch section, and a level shifter are formed in a DEEP-NWELL region formed over a semiconductor substrate. Another power supply switch section fed with another power supply voltage, a circuit block in which a power cutoff is performed by the power supply switch section, and a level shifter are formed in another DEEP-NWELL region formed over the semiconductor substrate. In this arrangement, there arises no possibility of short-circuiting between different power supplies via each DEEP-NWELL region formed over the semiconductor substrate.09-02-2010
20100019748SYSTEM AND METHOD FOR REDUCING VOLTAGE OVERSHOOT DURING LOAD RELEASE WITHIN A BUCK REGULATOR - A buck regulator comprises an upper switching transistor connected between a voltage input node and a phase node. A lower switching transistor is connected between the phase node and a ground node. An inductor is connected between the phase node and an output voltage node. Circuitry generates control signals to the upper switching transistor and the lower switching transistor responsive to the output voltage and a reference voltage. The control signals to the lower switching transistor selectively turn off the lower switching transistor responsive to a current direction through the lower switching transistor and an indication of whether a voltage error signal has been clamped at a selected level.01-28-2010
20100090669BUCK DC-TO-DC CONVERTER AND METHOD - A method and apparatus for converting a DC voltage to a lower DC voltage, provides for conducting current from an input terminal, through an inductor to charge a capacitor connected to the inductor at an output terminal and to provide a varying range of load current from the output terminal, alternately switching the input terminal between a supply voltage and a ground potential to produce a desired voltage at the output terminal that is lower than the supply voltage, while providing the varying range of load current, and disconnecting the input terminal from both the supply voltage and the ground potential to reduce an increase in voltage at the output terminal caused by a substantial reduction in the load current, while current through the inductor adjusts in response to the reduced load current.04-15-2010
20100066327VOLTAGE CONVERSION APPARATUS - A voltage conversion apparatus includes a DC-to-DC conversion circuit, a sensing circuit, and a compensation circuit. The voltage conversion apparatus is capable of adaptively adjusting the system bandwidth according to the load. The system bandwidth is increased to make the converted voltage responding to the load rapidly when the voltage conversion apparatus is operated at a transient state; and the system bandwidth is decreased to increase the system stability when the voltage conversion circuit is operated at a steady state.03-18-2010
20130127431SWITCHED-MODE POWER SUPPLY STARTUP CIRCUIT, METHOD, AND SYSTEM INCORPORATING SAME - A startup circuit delivers regulated startup current to a control IC in a switched-mode power supply (SMPS) system, and automatically disconnects the startup current when the SMPS Control IC starts switching the transformer or inductor used as the energy storage element in the SMPS system. Disconnection of the startup current may be triggered by detecting a time-varying voltage waveform on an accessible node in the SMPS system, or by detecting an increased current consumption by the SMPS Control IC, without requiring any ground reference to the SMPS Control IC, nor without requiring any logic signals generated by the SMPS Control IC. This provides for rapid and predictable startup of an SMPS Control IC and reduced power loss once the SMPS Control IC is operational, and is independent of the operating voltages of the SMPS control IC, and independent of the particular control scheme and switch topology of the SMPS system.05-23-2013
20130127433METHOD OF OPERATING VOLTAGE REGULATOR - A method of operating a voltage regulator circuit includes generating a control signal by an amplifier of the voltage regulator circuit. The control signal is generated based on a reference signal at an inverting input of the amplifier and a feedback signal at a non-inverting input of the amplifier. A driving current flowing toward an output node of the voltage regulator circuit is generated by a driver responsive to the control signal, and the driver is coupled between a first power node and the output node. The feedback signal is generated responsive to a voltage level at the output node. A transistor, coupled between the output node and a second power node, is caused to operate in saturation mode during a period while the voltage regulator circuit is operating.05-23-2013
20110127979Device for adapting source voltages - The invention relates to a device for adapting the electric voltage generated by at least one electrochemical energy storage, in particular battery or accumulator, comprising at least a first electrical connection for the energy storage and comprising at least a second electrical connection for a load, which is to be supplied by the energy storage, comprising at least one transforming unit, which changes the source voltage of the energy storage and which encompasses a voltages converter and a control unit, which is in each case connected to the voltage converter. In order to creating a device for adapting a source voltage, which has an improved reliable long-term function and the production of which is relatively low-cost, at least two transforming units are connected in parallel to one another between the first and the second electrical connection. In this case, a distributor resistance is connected in series to each transforming unit.06-02-2011
20090278518VOLTAGE REGULATOR - A voltage regulator is disclosed that includes first and second output transistors each outputting a current from the input terminal to the output terminal of the voltage regulator; and a control circuit part controlling the operations of the first and second output transistors to equalize a voltage proportional to an output voltage with a reference voltage. The control circuit part includes first and second error amplifier circuits each amplifying and outputting the difference between the proportional and reference voltages. The second error amplifier circuit consumes a smaller amount of current than the first error amplifier circuit. The control circuit part controls the output voltage by controlling the operations of the first and second output transistors using the first error amplifier circuit or controlling the operation of the second output transistor using the second error amplifier circuit in accordance with a control signal externally input to the control circuit part.11-12-2009
20090273326SYSTEMS AND METHODS FOR CONTROLLING OUTPUT CURRENTS OF POWER CONVERTERS - A power converter can include a high-side switch coupled to a power supply terminal and selectively coupled to ground via a conduction path. During an on state duration, the high-side switch can be enabled and the conduction path can be disabled. During an off state duration, the high-side switch can be disabled and the conduction path can be enabled. During a skip state duration, the high-side switch and the conduction path both can be disabled. A controller coupled to the high-side switch can control the on state duration and the skip state duration based on a current reference. The controller can further generate a first control signal for controlling the high-side switch and the conduction path according to the on state duration and the skip state duration, and adjust an output current of the power converter to the current reference according to the first control signal.11-05-2009
20090322299NON-ISOLATED CURRENT-MODE-CONTROLLED SWITCHING VOLTAGE REGULATOR - A novel voltage regulator includes an indictor, a switching transistor, a rectifier, an error amplifier circuit, a first voltage comparator circuit, a second voltage comparator circuit, an oscillator circuit, and a driver circuit. The first voltage comparator circuit outputs a modulation signal. The second voltage comparator circuit activates an enable signal when the error voltage exceeds the second reference voltage. The oscillator circuit outputs a clock signal with a fixed frequency according to the enable signal. The oscillator circuit enters a first state when the enable signal is activated and deactivated within a period of time shorter than a threshold time, and enters a second state when the enable signal remains activated during a period of time longer than the threshold time. The driver circuit generates the switching control signal based on the clock signal and the modulation signal.12-31-2009
20090322298SWITCHING REGULATOR AND SEMICONDUCTOR APPARATUS INCLUDING THE SAME - A switching regulator is disclosed that includes a switching element; an inductor; a rectifier element; an error amplifier circuit portion; a PWM pulse generating circuit portion; a current sensing circuit portion; an output voltage decrease detecting circuit portion; a current pulse generating circuit portion; a phase detecting circuit portion; a VFM pulse generating circuit portion; and a switching control circuit portion configured to generate a control signal based on a PWM signal or a VFM signal and to switch a control status of the switching element from a PWM control to a VFM control in accordance with a third signal output from the phase detecting circuit portion, and to switch the control status from the VFM control to the PWM control in accordance with a second signal output from the output voltage decrease detecting circuit portion.12-31-2009
20090322294CONTROL DEVICE FOR TRANSIENT RECOVERY OF DC-DC CONVERTERS - A control device for fast transient recovery of the output voltage of DC-DC converters. The control device is characterized by using a dual-threshold method to compare the actually received loading voltage values on the loading terminals of DC-DC converters, i.e., a total of four threshold levels including a negative-ripple falling-edge threshold and a negative-ripple rising-edge threshold on the negative polarity, and a positive-ripple rising-edge threshold and a positive-ripple falling-edge threshold on the positive polarity. During the transient, the load current charging/discharging control device disclosed in the invention may be switched between charging and discharging mode based on the relation between two-pairs threshold values and output voltage amplitude of DC-DC converters. This mechanism may allow DC-DC converters with higher slew rate to make transient ripples on output voltage to return to steady state more quickly.12-31-2009
20090115389PULSE WIDTH MODULATION REGULATOR SYSTEM WITH AUTOMATICALLY SWITCHING PULSE SKIPPING MODE - A pulse width modulation (PWM) Regulator System with automatically switching pulse skipping mode (PSM) is disclosed. The PWM regulator system comprises a PWM regulator, a PSM switching module and a pulse generator. The PWM regulator converts the input voltage by PWM. The PSM switching module determines to enter or exit the PSM. The pulse generator adaptively produces pulse signal for the switching regulator to operate in PSM.05-07-2009
20090153116SWITCHING CONTROLLER AND SEMICONDUCTOR DEVICE USED IN THE SAME - According to the present invention, in a switching power supply, a feedback signal from an output voltage detection circuit 06-18-2009
20090115388DC/DC converter - A DC/DC converter is constituted of a switching element (e.g., a MOS transistor), an LC low-pass filter constituted of an inductor and a capacitor, and a control circuit for controlling the on/off timing of the switching element such that the output voltage is set to a predetermined voltage value. A series circuit (serving as a snubber circuit) constituted of a resistor and a switch is further connected in parallel with the inductor. The control circuit closes the switch so that the resistor is connected in parallel with the inductor in a resonance mode of the LC low-pass filter. Thus, it is possible to dissipate energy accumulated in the inductor in a short time without using a relatively large circuit scale, thus avoiding the occurrence of ringing.05-07-2009
20090115386POWER SUPPLY CIRCUIT AND PORTABLE DEVICE - In a power supply circuit, a first switching transistor and a second switching transistor are serially connected between another-side terminal GND and a one-side terminal V05-07-2009
20080290850Switch control device, switch control method, and converter using the same - A switch control device, a switch control method, and a converter using the same are disclosed. The converter includes: a switch; an energy transfer element that converts input energy into output energy according to a switching operation of the switch; and a switch control device that generates a first signal, which is maintained at a first level during a first interval starting from a first time at which the switch is turned on by using a feedback signal corresponding to the output energy and is then gradually lowered from the first level to the feedback signal during a second interval, and controls the switching operation of the switch by using a second signal corresponding to a current flowing at the switch and the first signal. A malfunction due to an LEC can be effectively prevented, and the converter and the converter controller can be implemented to be compact and low-priced.11-27-2008
20110031949SELF-OSCILLATING SWITCHED MODE CONVERTER WITH VALLEY DETECTION - An energy converter is disclosed in which self oscillation mode operation is improved by a closed loop feedback control. The feedback control utilises the voltage error from the voltage valley in the drain voltage (Vdrain) of the converter switch (02-10-2011
20090108823CONTROL CIRCUIT AND METHOD FOR MAINTAINING HIGH EFFICIENCY IN SWITCHING REGULATOR - A high efficiency control circuit for operating a switching regulator is provided. The switching regulator can regulate an output voltage no matter the input voltage is higher, lower, or close to the output voltage. The switching regulator has first, second, third and fourth switches. The control circuit can operate the switching regulator in buck mode, boost mode, or buck-boost mode. In a buck-boost mode, the control logic drives the four switches in an efficiency sequence for reducing energy consumption during the switch transition, on the other side, resistive loss owing to the energy transfer phase is also minimized. Furthermore, the invention is capable of control duty cycle limitation to fit the consideration of the linearity of the converter.04-30-2009
20110031947Flip chip package for monolithic switching regulator - Methods and apparatuses related to packaging a monolithic voltage regulator are disclosed. In one embodiment, an apparatus includes: (i) a monolithic voltage regulator with a transistor arranged as parallel transistor devices; (ii) bumps on the monolithic voltage regulator to form connections to source and drain terminals of the transistor; (iii) a single layer lead frame with a plurality of interleaving lead fingers coupled to the monolithic voltage regulator via the bumps, where the single layer lead frame includes first and second surfaces, where the first surface includes a first pattern to form connections to the bumps, and where the second surface includes a second pattern that is different from the first pattern; and (iv) a flip-chip package encapsulating the monolithic voltage regulator, the bumps, and the single layer lead frame, where the flip-chip package has external connectors of the monolithic voltage regulator at the second surface of the single layer lead frame.02-10-2011
20090045790SWITCHING MODE POWER SUPPLY APPARATUS HAVING PASSIVE CLAMP CIRCUIT - A switching mode power supply apparatus includes a transformer, a main switch to adjust power supplied to a primary coil of the transformer, a passive clamp circuit to suppress a voltage stress of the main switch, and a control circuit to disable a clamping operation of the passive clamp circuit in a standby mode of the switching mode power supply apparatus. Power is not consumed in the passive clamp circuit in a standby mode so that power consumed in the standby mode can be remarkably reduced.02-19-2009
20100295523POWER CONVERTER USING A RECTIFIER WITH NORMALLY ON TRANSISTORS - The invention relates to a power converter comprising, in particular, a rectifier comprising at least one switching leg provided with two transistors (T11-25-2010
20100295522SEMICONDUCTOR DEVICE HAVING VOLTAGE REGULATOR - A semiconductor device includes a voltage regulator. The device includes an operational amplifier configured to compare an input voltage with a feedback voltage and output an output voltage, an up-resistor connected between an output of the operational amplifier and a first node, a down-resistor connected between a second node and a ground voltage terminal, and a switching unit including a fuse box connected between a third node outputting the feedback voltage and a fourth node having a variable resistance value, and configured to connect the first node with the fourth node and the second node with the third node, or connect the first node with the third node and the second node with the fourth node.11-25-2010
20100301819HIGH VOLTAGE GENERATING APPARATUS - A high voltage generating apparatus includes a regulator configured to control a pumping voltage at a voltage of a certain level, and an amplifier configured to amplify a current flowing through an output terminal of the regulator and to output an amplified current.12-02-2010
20100301818VOLTAGE LEVEL SHIFTER AND SEMICONDUCTOR DEVICE HAVING THE SAME THEREIN - A voltage level shifter and a semiconductor device having the same are presented. The voltage level shifter includes a swing width transformer and a power supply controller. The swing width transformer receives an input signal that ranges between a first level power voltage and a ground voltage and is configured to generate a signal that ranges between a second level power voltage and that of the ground voltage. The power supply controller is configured to control power supply to the swing width transformer in response to an enable signal activated in an active mode.12-02-2010
20100320982COMBINED TYPE TRANSFORMER AND BUCK-BOOST CIRCUIT USING THE SAME - Combined type transformer includes: a transformer core; first and second coils provided with respect to the transformer core; first and second inductor cores provided around the first coil; and third and fourth inductor cores provided around the second coil. The transformer core and the first and second coils constitute a transformer, the first coil and the first and second inductor cores constitute a first inductor, and the second coil and the third and fourth inductor cores constitute a second inductor.12-23-2010
20110121803SEMICONDUCTOR DEVICE AND DC-DC CONVERTER - According to one embodiment, a semiconductor device includes a base layer of a second conductivity type, a device isolation layer, a control electrode, a high dielectric layer, a first main electrode, and a second main electrode. The base layer includes a source region of a first conductivity type and a drain region of the first conductivity type. The source region and the drain region are selectively formed on a surface of the base layer. The device isolation layer is provided in the base layer to be extended in a direction from the source region to the drain region. The control electrode is provided on a top side of the device isolation layer to control a current passage between the source region and the drain region. The high dielectric layer is arranged in at least a part on a top side of the base layer or in at least a part in the device isolation layer. The high dielectric layer has a higher dielectric constant than a dielectric constant of the device isolation layer. The first main electrode is connected to the source region. The second main electrode is connected to the drain region.05-26-2011
20100134080ADAPTIVE CONSTANT ON-TIME SWITCHING REGULATOR - The present invention provides an adaptive constant on-time switching regulator which comprises a switching circuit, a control circuit, and an output circuit. The control circuit controls the switches in the switching circuit to be turned on for an adaptive constant time, and be turned off for a minimum time.06-03-2010
20100320978SYSTEM, METHOD AND APPARATUS FOR CONTROLLING CONVERTERS USING INPUT-OUTPUT LINEARIZATION - A system, method and apparatus for controlling boost and buck-boost converters using input-output linearization and leading-edge modulation is provided. The controller includes a summing circuit connected to the converter to create a third voltage representing a difference between the first voltage and the second voltage. A gain circuit is connected to the summing circuit to adjust the third voltage by an appropriate gain. A modulating circuit is connected to the gain circuit, the converter, the first voltage, the second voltage and the second current to create a control signal based on the first voltage, the second voltage, the adjusted third voltage, the fourth voltage and the first current. The control signal is used to control the converter. Typically, the first voltage is a converter output voltage, the second voltage is a reference voltage, the fourth voltage is a converter input voltage, and first current is a converter inductor current.12-23-2010
20090134856Method of optimum current blanking time implementation in current sense circuit - In a method and system for sensing current in a switching regulator (SWR) operating in a current mode, a power switch is coupled to receive the current from a switching element, the power switch being controlled by a gate signal. An inrush of the current causes an initial transient spike (ITS). A buffer having a buffer input and a buffer output is coupled to receive the gate signal and provide a buffered gate signal. The buffer output is disabled during the ITS. A sense switch (SW) is coupled to receive a portion of the current from the switching element, the SW being turned on by the buffered gate signal after the initial transient spike. A sense resistor (SR) is coupled to receive the portion of the current from the SW. An amplifier converts the portion of the current through the SR to a voltage signal for controlling the SWR.05-28-2009
20110241637SWITCHED CAPACITOR HOLD-UP SCHEME FOR CONSTANT BOOST OUTPUT VOLTAGE - A power architecture receives an input signal at an input node and converts the input signal into an intermediate signal with a power conversion stage. The power conversion stage supplies the intermediate signal to an output node of the power conversion stage where the intermediate signal is filtered with an operating capacitance coupled to the output node. A hold-up capacitance is charged, and when a loss of the input signal is detected, the hold-up capacitance is coupled to the input node.10-06-2011
20110241639DC-DC CONVERTER, AND POWER SUPPLY CIRCUIT HAVING DC-DC CONVERTER - A DC-DC converter converts an input voltage input from an input terminal to a predetermined voltage and outputs the converted voltage from an output terminal, the DC-DC converter including an output control transistor and an operation control circuit that has an error amplifying circuit, whereby the error amplifying circuit includes an output circuit configured to output an error voltage and include an output transistor of a source follower connection, a series circuit configured to include a resistor for phase compensation and a capacitor for phase compensation and be connected between a control electrode of the output circuit and a grounding voltage terminal, and an amplifying circuit configured to be positioned on a side more distant from a side outputting the error voltage relative to the output circuit in the error amplifying circuit, and include a voltage generating element as a load of the amplifying circuit.10-06-2011
20100237840Bidirectional Power Converters - Circuits and methods for bidirectional power conversion are provided that allow mobile and other devices to generate power suitable to support multiple modes of operation. The bidirectional power converters of the present invention may operate in both step up and step down configurations rather than having a single dedicated conversion function and use many of the same components thereby reducing converter size and complexity. In some embodiments, the converter of the present invention may be used to provide a power component of a communications link, such as a USB link.09-23-2010
20110109290FREQUENCY CONTROL CIRCUIT AND METHOD FOR A NON-CONSTANT FREQUENCY VOLTAGE REGULATOR - A non-constant frequency voltage regulator includes a constant-time trigger to generate a pulse width modulation signal, a current generator to provide a first current to set a constant on-time or a constant off-time for the pulse width modulation signal, and a frequency control circuit to detect the pulse width of a phase node voltage, compare the pulse width with the constant on-time or the constant off-time set by the first current to generate a second current, and add the second current to the first current to supply to the constant-time trigger to control the frequency of the pulse width modulation signal.05-12-2011
20100327833Buck-Boost Switching Regulator and Method Thereof - A method for DC/DC conversion comprises operating in a Boost mode of operation or in a Buck-Boost mode of operation. Furthermore, the method comprises switching from the Boost mode of operation to the Buck-Boost mode of operation, if a desired value (VOUTR) of an output voltage (VOUT) which is generated from a supply voltage (VIN) by the DC/DC conversion is smaller than a first reference voltage (VR12-30-2010
20110109289SWITCHING REGULATOR CIRCUIT AND OPERATION METHOD THEREFOR - A switching regulator circuit for achieving stepping-up or stepping-down, including a basic circuit and an inductor connected to the basic circuit. The basic circuit includes a switching circuit to perform switching, a control circuit to control the switching circuit, a first terminal connected to one end of the inductor and the switching circuit, and second and third terminals connected to the switching circuit. When the input voltage is stepped up, the control circuit causes the switching circuit to charge the inductor via the first terminal and the third terminal and to discharge the inductor via the first terminal and the second terminal. When the input voltage is stepped down, the control circuit causes the switching circuit to charge the inductor via the first terminal and the second terminal and to discharge the inductor via the first terminal and the third terminal.05-12-2011
20110025284MULTI-PHASE DC-TO-DC CONVERTER WITH DAISY CHAINED PULSE WIDTH MODULATION GENERATORS - A multi-phase DC-DC converter is disclosed. The DC-DC converter has a plurality of phases, each with a separate PWM generator for driving a totem pole of transistors. A master PWM generator operates off of a master clock signal. The remainder of the phases are slaved to the master PWM generator.02-03-2011
20110127978PWM CONTROLLER WITH LOW UVLO VOLTAGE - The present invention discloses a PWM controller with low UVLO voltage for switching power applications, having a power supply end coupled to a main input voltage via a resistor and coupled to a ground via a capacitor, and an output end coupled to the gate terminal of a primary side transistor requiring a minimum gate voltage, the PWM controller comprising: a UVLO unit; used for performing a hysteresis comparison of a supply voltage at the power supply end with a UVLO_ON voltage and a UVLO_OFF voltage to generate a control signal, wherein the UVLO_OFF voltage can be as low as the minimum gate voltage; a PWM unit, actuated by the control signal to deliver a PWM signal; and a driving stage, comprising a PMOS transistor having a gate coupled to the PWM signal, a source coupled to the supply voltage and a drain coupled to the output end.06-02-2011
20100181981SYNCRONOUS SWITCHING REGULATOR CONTROL CIRCUIT - A switching regulator includes a first switching regulator corresponding to a master channel, and a second switching regulator corresponding to a slave channel. The first switching regulator generates first output voltage Vout07-22-2010
20110018511INTEGRATABLE EFFICIENT SWITCHING DOWN CONVERTER - A converter circuit and methods for operating the same. The converter circuit includes a supply voltage, a capacitor, an inductor, and four stacked switching elements. Each switching element is adjustable from a low resistance state to a high resistance state by a control signal. The inductor outputs current to a circuit load. The circuit may be operated in a first mode such that the output is adjustable between the supply voltage and half the supply voltage. Alternatively, in a second mode of operation, the output is adjustable from half the supply voltage to a ground voltage.01-27-2011
20090066306CONSTANT VOLTAGE CIRCUIT - A constant voltage circuit converts a voltage input to an input terminal and outputs a predetermined constant voltage from an output terminal. The constant voltage circuit includes an output transistor that outputs an electrical current corresponding to a control signal input thereto to the output terminal, a differential amplifier circuit that outputs the control signal according to a difference between a comparative voltage proportional to the output voltage and a predetermined reference voltage, a current mirror circuit that serves as a load of a pair of input transistors included in the differential amplifier circuit, and a voltage comparator that compares a voltage at a control electrode of a transistor included in the current mirror circuit and a voltage of the control signal. The differential amplifier circuit controls a bias electrical current supplied to the pair of input transistors according to a comparison result of the voltage comparison.03-12-2009
20090066305SWITCHING REGULATOR - A switching regulator includes a first switch, an inductor, a second switch, a controller to control a switching operation by switching the first switch and switching the second switch complementally to the first switch, and a reverse current detector to detect a reverse current that flows from an output terminal toward the second switch. The reverse current detector generates a proportional voltage that is proportional to a voltage at a junction node between the second switch and the inductor, and detects a generation or an indication of the reverse current based on the proportional voltage. The controller turns the second switch off to create a shutdown state when the reverse current detector detects the generation or the indication of the reverse current.03-12-2009
20110109288POWER CONVERTING CIRCUIT - A power converting circuit including a converting circuit and a controller is provided. In an embodiemnt of the invention, the inductance of the converting circuit and the operation frequency of the controller can be adjusted according to the power required by the load and/or the size of the inductor current to effectively reduce the switching times and the switching loss of the switch in the converting circuit when the load is light. Accordingly, no matter the load is light or heavy, the efficiency of the power converting circuit can be maintained at a higher standard.05-12-2011
20110109291FREQUENCY CONTROL CIRCUIT AND METHOD FOR A NON-CONSTANT FREQUENCY VOLTAGE REGULATOR - A non-constant frequency voltage regulator includes a constant-time trigger to trigger a constant on-time or a constant off-time for a pulse width modulation signal, a current generator to provide a first current to determine the constant on-time or the constant off-time, a power output stage operated by the pulse width modulation signal to produce a load current, and a frequency control circuit for loading feed forward by a second current added to the first current to adjust the constant on-time or the constant off-time for frequency compensation to the pulse width modulation signal.05-12-2011
20110025280REGULATOR HAVING PHASE COMPENSATION CIRCUIT - A regulator circuit includes an output transistor that generates an output current in accordance with a control voltage that is applied to a control terminal of the output transistor. A differential amplifier provides feedback control of the control voltage in accordance with a level of the output current. A phase compensation circuit is connected to the differential amplifier and the control terminal of the output transistor. The phase compensation circuit adjusts an output impedance of the differential amplifier. The phase compensation circuit includes a variable resistor that decreases the output impedance of the differential amplifier when the output current increases.02-03-2011
20110025283DC-DC CONVERTER, CONTROL CIRCUIT, AND POWER SUPPLY CONTROL METHOD - A DC-DC converter includes a first amplifier that amplifies a first difference between a first reference voltage and a feedback voltage corresponding to an output voltage, a second amplifier that amplifies a second difference between the first reference voltage and an integrated value of the feedback voltage, and a controller that controls a switching circuit to change the output voltage when the first difference reaches the second different.02-03-2011
20110025281Transient Differential Switching Regulator - The present invention provides a transient differential switching regulator for a DC power supply. In one aspect, an output of the regulator is provided between a positive voltage line and a return line. A switching circuit switches the regulator between a normal mode, wherein the output voltage is controlled at a set-point voltage, and a current mode wherein the output current is controlled so as not to exceed a peak current limit. In one aspect, an output of the regulator is provided between a positive voltage line and a return line. A first inductance is disposed in the positive voltage line, and a second inductance is disposed in the return line. In another aspect a current detecting circuit is configured to perform dual functions of measuring the DC current so as to protect against an over-current condition arising during the normal operation mode and detecting high transient current conditions.02-03-2011
20110127980VOLTAGE CONVERTING CIRCUIT AND METHOD THEREOF - A voltage converting circuit including a power stage, a filter, a comparator, a first and a second feedback units. The power stage receives an input voltage and outputs the input voltage according to a duty cycle. The filter receives the input voltage to convert the input voltage into a current, and filters the current to obtain an output voltage. The first feedback unit amplifies a difference between a reference voltage and the output voltage to obtain an error voltage. The second feedback unit calculates the quadratic differential and integration of the output voltage to obtain a sensing voltage. The comparator compares the error voltage and the sensing voltage, and outputs a comparing result to adjust a duty ratio. Herein, a ripple of the output voltage is linearly proportional to that of the current, and DC divided voltage level of the output voltage is substantially equal to the reference voltage.06-02-2011
20110043176STEP-DOWN SWITCHING REGULATOR - A step-down switching regulator includes a switching element performing switching in accordance with an input control signal to charge an inductor with an input voltage; a synchronous rectification element performing switching in accordance with an input control signal to discharge the inductor; a power supply circuit part generating and outputting a supply voltage; a capacitor connected to the connection of the switching element and the inductor; a first drive circuit part controlling the switching of the switching element in accordance with an input control signal; a second drive circuit part controlling the switching of the synchronous rectification element in accordance with another input control signal; and a control circuit part generating and outputting the control signals to the first and second drive circuit parts so that the predetermined constant voltage is output from an output terminal, wherein the second drive circuit part is supplied with power from the capacitor.02-24-2011
20110043174VOLTAGE CONVERTER WITH FIRST PUSH - A boost DC/DC power converter is disclosed that has a low voltage source, an inductor and a switching device that forms a series loop, a diode in series with a capacitor coupled across the switching device, a voltage divider coupled across the capacitor and a pulse width modulator that is coupled to the voltage divider. The boost converter includes a first push controller coupled across the switching device to provide a first push voltage of sufficient magnitude to turn the switching device on where the low voltage source by itself is not capable of generating a voltage of sufficient magnitude to operate the switching device.02-24-2011
20110115453NONLINEAR CONTROL LOOP FOR DC-DC CONVERTERS - A nonlinear converter, such as a DC-DC converter, includes a nonlinear controller configured to receive an output voltage and a current, and configured to generate a PWM signal. The PWM signal is generated based on setting the converter to a first phase associated with both buck and boost modes when a clock signal is asserted, and selecting a second phase associated with the buck mode of the converter, if a sliding function signal achieves a first predetermined relationship with respect to a buck threshold before a next clock signal is asserted, or selecting a third phase associated with the boost mode of the converter, if the sliding function signal achieves a second predetermined relationship with respect to a boost threshold before a next clock signal is asserted. The nonlinear converter may include a power stage configured to provide the output voltage and a coil current to the nonlinear controller.05-19-2011
20110043175CURRENT-MODE CONTROL SWITCHING REGULATOR AND OPERATIONS CONTROL METHOD THEREOF - Disclosed is a current-mode control switching regulator that steps down or steps up an input voltage input to an input terminal to a predetermined constant voltage and outputs the stepped input voltage from an output terminal as an output voltage. The current-mode control switching regulator includes a switching element, an inductor, a rectifying element, an error amplification circuit unit, an oscillation circuit unit with variable oscillation frequency, a slope voltage generation circuit unit, and a switching control circuit unit.02-24-2011
20090066304Switching Regulator And Electronic Device Therewith - A switching regulator according to the invention includes: an output switching element; an output feedback circuit generating an error voltage (Verr) according to an error between an output voltage (Vout) and a target voltage; a switching control circuit turning on and off the output switching element based on the error voltage (Verr); a short-circuit current protection circuit that includes a first comparator (CMP03-12-2009
20100033147METHOD AND APPARATUS FOR MAINTAINING A CONSTANT LOAD CURRENT WITH LINE VOLTAGE IN A SWITCH MODE POWER SUPPLY - A power supply regulator including a variable current limit threshold that increases during an on time of a switch. In one aspect, a power supply regulator includes a comparator that has a first input coupled to sense a voltage representative of a current flowing through a switch during an on time of the switch. The comparator has a second input coupled to receive a variable current limit threshold that increases during the on time of the switch. A feedback circuit is coupled to receive a feedback signal representative of an output voltage at an output of a power supply. A control circuit is coupled to generate a control signal in response to an output of the comparator and in response to an output of the feedback circuit. The control signal is to be coupled to a control terminal of the switch to control switching of the switch.02-11-2010
20110127977VOLTAGE CONVERTER AND CONTROL METHOD THEREOF - A voltage converter for converting an input voltage into an output voltage, wherein the output voltage is output to a load, is provided. An inductor is coupled between an output terminal and a node. A transistor is coupled between an input terminal and the node. A pulse width modulation (PWM) controller generates a first control signal according to the output voltage and a first reference voltage. An amplifier generates a second control signal according to the output voltage and a second reference voltage. A detector detects a loading of the load to generate a switching signal. A switching circuit selectively couples one of the PWM controller and the amplifier to the transistor according to the switching signal. The switching circuit controls the transistor according to the second control signal when the amplifier is coupled to the transistor, such that the transistor is operated in a saturation region.06-02-2011
20100164452CURRENT REGULATOR - A current regulator includes a first switch, a second switch, a first current detecting circuit, a second current detecting circuit and a control circuit. Both of the first and second current detecting circuits detect the current of corresponding power route. The control circuit controls the first and the second switches on the route to be turned on or turned off according to detecting signals, and regulates to keep the wiring current in balance.07-01-2010
20100164448Saturating Series Clipper - A clipper circuit for regulating an unregulated or semi-regulated output of a power supply unit. The circuit includes a gate element between the load and the input voltage from the power supply unit. The gate is activated by a comparing circuit, which turns the gate on or off based on the feedback voltage of the circuit output, compared with a reference voltage. The gate is in saturation mode during normal and heavy loading and in linear mode during light loading.07-01-2010
20100164449Power Converter with a Dynamically Configurable Controller and Output Filter - A controller and an output filter for a power converter, and a power converter employing at least one of the same. In one embodiment, the controller includes an error amplifier with first and second input terminals coupled to one of an operating characteristic and a reference voltage of the power converter, and a switch configured to couple the first and second input terminals to one of the operating characteristic and the reference voltage as a function of a power conversion mode of the power converter. In one embodiment, the output filter includes an output filter capacitor with a first terminal coupled to a first output terminal of a power converter, and an output filter inductor coupled between a second terminal of the output filter capacitor and a second output terminal of the power converter.07-01-2010
20110127981CONTROL CIRCUIT FOR SWITCHING POWER SUPPLY UNIT, ELECTRONIC DEVICE AND METHOD FOR CONTROLLING SWITCHING POWER SUPPLY UNIT - A control circuit which switches a power supply circuit includes: a first control circuit to suspend a switching operation based on an output voltage of the switching power supply circuit; and a second control circuit to change a magnitude of a first load coupled to an output of the switching power supply circuit based on a suspension period of the switching operation, wherein the second control circuit changes the magnitude of the first load in a first suspension period based on a second load, which is updated in a second suspension period prior to the first suspension period.06-02-2011
20100253304METHOD FOR OPERATION OF A CONVERTER CIRCUIT, AND APPARATUS FOR CARRYING OUT THE METHOD - An exemplary method is disclosed for operation of a converter circuit having first and second partial converter systems, the partial converter systems being connected in series to one another via two series-connected inductances. A junction point of the two series-connected inductances forms an output connection. Each partial converter system can include at least one two-pole switching cell, each switching cell having two series-connected controllable bidirectional power semiconductor switches. The power semiconductor switches in the switching cells of the first and second partial converter system are controlled by first and second control signals. A capacitive energy store in the converter circuit can be designed independent of desired current at the output connection of the converter circuit.10-07-2010
20090085542DRIVE SYSTEM FOR POWER SEMICONDUCTOR DEVICE - An output signal from a driver is provided to an output unit which includes first and second transistors to output a drive signal for driving a power device. A control signal is supplied from a control signal supply. The control signal indicates an enabled state and a disabled state to control the first and second transistors. The control signal is provided to a voltage output circuit. An output signal from the voltage output circuit is provided to a voltage hold circuit. The first and second transistors are turned off by a disable circuit when the control signal is in the disabled state. A shutdown circuit operates to draw out current from an output terminal of the output unit based on a signal provided from the voltage hold circuit and the control signal when the control signal is in the disabled state.04-02-2009
20110062924SWITCHING APPARATUS AND CONTROL SIGNAL GENERATOR THEREOF - A switching apparatus has a switch and a control signal generator. The control signal generator is configured to generate a control signal applied to the switch to control the operations of turning on and off of the switch. The control signal generator has an inverter and a regulating circuit. The input end of the inverter receives an input signal, and the output end of the inverter outputs the control signal. The regulating circuit has a switching unit and a capacitor. A first end of the switching unit is coupled to the output end of the inverter, a second end of the switching unit is coupled to a first system voltage, a third end of the switching unit is coupled to a first end of the capacitor, and a second end of the capacitor is coupled to a second system voltage.03-17-2011
20090322296Multi-chip module for power supply circuitry - A multi-chip module (MCM) for power supply circuitry integrates a controller, a driver and two power MOSFETs in a single chip to shorten the signal path between the controller and the driver. When applied to a voltage regulator, the MCM shortens the feedback paths between the current sensors and the controller, so as to reduce the loss of and interference with the feedback signals, thereby improving the efficiency of the voltage regulator and simplifying the PCB traces routing.12-31-2009
20110241638FEEDBACK VOLTAGE STABILIZING APPARATUS, METHOD, AND POWER CONVERSION SYSTEM - Feedback voltage stabilizing apparatus, method, and power conversion system are disclosed. The apparatus includes a first switching unit, a second switching unit, and a conduction control unit. In which, the first switching unit is coupled to a feedback circuit for controlling whether a feedback signal is transmitted from a first end to a second end. The second switching unit is for avoiding voltage vibrations which caused by the feedback signal occurring at the second end. By capturing a detection signal, the conduction control unit can determine whether to simultaneously turn on the first switching unit and the second switching unit, in order to eliminate the voltage vibrations, or not.10-06-2011
20110084674POWER CONVERTER USING NORMALLY ON FIELD EFFECT TRANSISTORS - The invention relates to a power converter comprising:04-14-2011
20090219002SWITCHING POWER SUPPLY DEVICE AND A SEMICONDUCTOR INTEGRATED CIRCUIT - A capacitor is disposed between the output side and the ground potential of an inductor which creates an output voltage. A first switch element supplies a current from an input voltage to an input side of the inductor, and a second switch element which is turned on when the first switch element is off sets the input side of the inductor to a prescribed potential. A control circuit detects the arrival of the voltage on the input side of the inductor at a high voltage corresponding to the input voltage when the load circuit is in a light load state and the second switch element is off, and turns on the first switch element. It invalidates the detection output of the voltage detecting circuit when the load circuit is in a heavy load state and, after the second switch element is turned off, turns on the first switch element.09-03-2009
20090219000SWITCHING CONTROLLER WITH BURST MODE MANAGEMENT CIRCUIT TO REDUCE POWER LOSS AND ACOUSTIC NOISE OF POWER CONVERTER - A switching controller of power converter according to the present invention comprises a PWM circuit and a burst-mode management circuit to reduce the power loss and the acoustic noise of the power converter at light-load. The PWM circuit generates a PWM signal. The burst-mode management circuit receives the PWM signal to generate a switching signal for generating a switching current and regulating the output of the power converter. The burst-mode management circuit further generates a current-limit signal in response to the output of the power converter to limit the switching current for reducing the power loss and the acoustic noise of the power converter when the power converter is at light-load.09-03-2009
20090219001DRIVE CONTROLLER FOR POWER CONVERSION CIRCUIT - A drive controller is provided, for controlling driving of a power conversion circuit. The power control circuit includes a switching element for increasing/decreasing an absolute value of current passing through a coil by repeating electrical ON/OFF operation, so that voltage of power storage means is converted to a desired value required by power supply means, the switching element being provided for each positive/negative polarity of output current outputted from a circuit other than the power storage means, to the power storage means. Meanwhile, the drive controller includes energy loading means and OFF-state setting means. The energy loading means loads energy on the coil through a switching element not corresponding to existing polarity of the output current, after the absolute value has been zeroed by the turn OFF of the switching element corresponding to the existing polarity, but preceding an ON operation of the switching element corresponding to the existing polarity. The OFF-state setting means set both of the switching elements corresponding to and not corresponding to the existing polarity to an OFF state, after the energy loading process.09-03-2009
20090218998HIGH-SIDE SENSING OF ZERO INDUCTOR CURRENT FOR STEP DOWN DC-DC CONVERTER - A DC to DC converter circuit includes circuitry for generating a PWM waveform signal at a phase node of a DC to DC converter responsive to an input voltage and a monitor output voltage. The circuitry further includes a high side switching transistor connected between the input voltage and a phase node and a low side switching transistor connected between the phase node and ground. An output filter is connected to the circuitry for generating the PWM waveform signal. The output filter includes an inductor having a first side connected to the phase node and a second side connected to an output voltage node. Detection circuitry detects zero current crossings in the inductor responsive to a voltage across the high side switching transistor and a voltage across the low side switching transistor.09-03-2009
20110084675BOOSTER CIRCUIT - A booster circuit according to the present invention includes a booster that connects a boosting condenser that is charged and a direct-current power source in series through a switch for a boosting operation in order to generate a boosted voltage and charges a smoothing condenser with the boosted voltage through a switch for an outputting operation. The switch for the boosting operation is composed of a plurality of switches connected in parallel and at least one of the plurality of switches can be controlled independently.04-14-2011
20120229108Reduced power consumption for boost converter - A signal for controlling output voltage from the driver is modulated by the input signal to the driver, whereby the output voltage tracks the input signal, matching power to demand. The output storage capacitor can be reduced in size because the amount of energy that needs to be stored is reduced. In addition, feedback transistors are paired on the same substrate and cause opposite changes in response to changes in temperature, thereby automatically compensating for changes in temperature without the use of additional components.09-13-2012
20090243573COMPOUND POWER SUPPLY - A method of supply power to receive and provide a 10V input, 5V output with a continuous load of 1 A load current and a pulse load duration of 2 ms and a pulse load of 10 A load current, in a power supply including a switching regulator configured to provide a continuous current, the switching regulator comprising a current limit of 1.2 A and a linear regulator associated with the switching regulator. The method includes detecting whether a pulse load or a continuous load is required. The linear regulator is directed to provide a minimal current when the power supply is at a continuous load. The linear regulator is directed to provide a remaining portion of a pulse load current from the continuous load of the switching regulator. The switching regulator is deactivated and the linear regulator is directed to provide the continuous current in a condition that a noise-free mode is demanded.10-01-2009
20090322295TECHNIQUE TO IMPROVE DROPOUT IN LOW-DROPOUT REGULATORS BY DRIVE ADJUSTMENT - An electronic device includes a low drop-out regulator for providing a regulated output voltage. The low drop-out regulator generally comprises a power MOSFET transistor having a gate coupled to a driver. The driver has a first path including an NMOS transistor and being coupled to the gate of the power MOSFET, a second path having a PMOS transistor and being coupled to the gate of the power MOSFET, and a switch for alternately switching between the first and second paths so as to provide a voltage to the gate of the power MOSFET ranging from ground to a power supply level.12-31-2009
20100039087SWITCHING POWER SUPPLY CIRCUIT - A switching power supply circuit according to an aspect of the present invention includes: a switch; a coil serving as an energy transmitting element; a capacitor serving as an output generation circuit that outputs, as an output voltage, the energy transmitted from the coil; an output voltage detection circuit which generates a detection signal according to the output voltage; a PNP transistor serving as a transmission circuit that outputs a transmission signal according to a value of the detection signal; a controller which controls the switch according to the transmission signal; and a diode serving as a rectifying element connected between the transmission circuit (PNP transistor) and the controller.02-18-2010
20100039084CONTROLLABLE CIRCUIT - A switch-mode power circuit comprises a controllable element and a control unit. The controllable element is configured to control a current in response to a control signal supplied to the controllable element. The control unit is connected to the controllable element and provides the control signal. The control unit comprises a first signal processing unit, a second signal processing unit, and a combiner unit. The first signal processing unit has an output and is supplied with a first carrier signal and an input signal. The second signal processing unit has an output and is supplied with a second carrier signal and the input signal. The combiner unit is connected to the first and second signal processing units combining the outputs of the first and the second signal processing units to form a signal representative of the control signal.02-18-2010
20100039085BUCK BOOST FUNCTION BASED ON A CAPACITOR BOOTSTRAP INPUT BUCK CONVERTER - A buck boost voltage converter circuit, comprises a capacitor pump circuit for boosting an input voltage in a first mode of operation when an input voltage is below a desired voltage level. A buck converter circuit provides the output voltage responsive to the boosted input voltage from the capacitor pump circuit in the first mode of operation and provides the output voltage responsive to the input voltage in a second mode of operation when the input voltage is above the desired voltage level.02-18-2010
20100039086VOLTAGE CONVERTER - A voltage converter connectable to a power source (PS) and a load (LD) provides a regulated output voltage (Vout) from a voltage (Vin) power source by switchable current paths including an inductive element (L). The voltage converter includes a plurality of switching elements for switching the current paths of the voltage converter as a forward-phase current path when the input voltage corresponds to the output voltage, as an up-phase current path when the input voltage is lower than the output voltage, and as a down-phase current path when the input voltage is higher than the output voltage. A central controller controls a switching state of the plurality of switching elements, a current sensing unit including a comparator for sensing a current flowing through at least one of the switching elements, and a plurality of processing units for processing the current sensing.02-18-2010
20100066332Switching power supply with near zero supply current in light-load operation - Techniques for near zero light-load supply current in switching power supply are described. In one embodiment, a switching power supply comprises sub-circuits, a capacitor/inverter circuit, and a standby control circuit. The sub-circuits comprise a feedback resistor that supplies a fraction of an output voltage of the power supply, an integrator that provides an integrator output, a comparator that provides a pulse width modulated signal, a switching element that receives the pulse width modulated signal and modulates current such that the power supply provides a regulated voltage, and a monitoring circuit that provides a logic low signal when the pulse width modulated signal is absent over a period of time. The standby control circuit disables the sub-circuits when the logical low signal is detected permitting the switching power supply to operate at a minimum current, an re-enables the sub-circuits when an out of regulation signal from the capacitor/inverter circuit is detected.03-18-2010
20120242311Systems and Methods of Dynamic Current Limit - Systems and methods of dynamic current limit are disclosed herein. A current is sensed a wireless charging circuit, for example. When the current sense reaches a reference current level while a communication is active, the current limit is enabled for the next packet. The current limit signal may be cleared for the next packet.09-27-2012
20120242312VOLTAGE REGULATOR - There is provided a voltage regulator capable of achieving a fast transient response upon activation without allowing an abnormal consumption current to flow. The voltage regulator of the present invention includes: a booster circuit for detecting output current from an output transistor and outputting a boost signal to a first differential amplifier circuit; a sensing transistor for sensing the output current; a first transistor for making an adjustment to enable the output current to be copied accurately; and a second differential amplifier circuit in which the output terminal is connected to the gate of the first transistor, the inverting input terminal is connected to the drain of the sensing transistor, and the non-inverting input terminal is connected to the output terminal.09-27-2012
20100066326POWER REGULATOR - A power regulator for converting an input voltage to an output voltage includes a pass device and an error amplifier. The pass device receives the input voltage and provides the output voltage at an output terminal of the power regulator. The error amplifier coupled to the pass device includes a transistor. The transistor receives a reference signal and a feedback signal indicative of the output voltage, compares the feedback signal to the reference signal, and generates a control signal according to a result of the comparison to drive the pass device.03-18-2010
20100066333CURRENT MODE CONTROL TYPE SWITCHING REGULATOR - A switching regulator for converting input voltage to output voltage includes a switch; an inductor energized by input voltage by the switch; a rectifier for discharging the inductor; and a slope voltage generator for generating slope voltage inclined responsive to current of the inductor, amplifies a difference between reference voltage and divided output voltage, and compares the amplified voltage and the slope voltage to generate signal for controlling the switch. The slope voltage generator includes a detector for converting current flowing through the inductor when the switch is on into voltage; and a voltage generator for generating ramp voltage. These voltages are added as the slope voltage. The voltage generator includes constant current; a resistor; and a ramp capacitor charged by the constant current through the resistor. Voltage drop of the resistor is added to terminal voltage of the ramp capacitor to output the ramp voltage.03-18-2010
20100066323SYSTEM AND METHOD FOR PROVIDING PULSE FREQUENCY MODULATION MODE - A voltage regulator comprises switching circuitry for generating a phase voltage at a phase node responsive to an input voltage and switching control signals. An inductor is connected to the phase node and an output voltage node. A capacitor is connected between the output voltage node and ground. An error amplifier generates an error voltage responsive to an output voltage from the output voltage node and a reference voltage. Switching control circuitry generates switching control signals to the switching circuitry responsive to the error voltage, a ramp voltage and an established voltage level. The switching control circuitry operates the voltage regulator in a pulse frequency modulation mode of operation after sampling the error voltage and setting the established voltage level and exits the pulse frequency modulation mode of operation when the error voltage falls below the established voltage level.03-18-2010
20100066330SEMICONDUCTOR CIRCUIT - A semiconductor circuit (03-18-2010
20100066329SUPPLY WITH FREQUENCY CONVERSION FUNCTION AND COMPUTER SYSTEM THEREOF - The invention discloses a power supply with a frequency conversion function. The power supply is connected with a motherboard. The power supply includes a pulse width modulation (PWM) controller, a direct current-direct current (DC-DC) converter, and a switch resistor modulation circuit. The PWM controller generates a PWM signal. The DC-DC converter is connected with the PWM controller and the motherboard, and it generates a plurality of voltages to the motherboard after it receives the PWM signal. The switch resistor modulation circuit provides a first resistance value and a second resistance value switched to correspondingly generate a first switching frequency or a second switching frequency. The second resistance value is larger than the first resistance value. The second switching frequency is smaller than the first switching frequency.03-18-2010
20100066328DC-DC CONVERTER - A non-isolated DC-DC converter that converts a voltage input to an input terminal to output a constant output voltage to a load terminal while switching control mode between a PWM mode and a VFM mode depending on a current output to the load terminal. The DC-DC converter includes an inductor, a switching circuit, and a control circuit. The inductor stores electric energy for supply to the load terminal. The switching circuit switches on and off current flow at a switching frequency to alternately charge and discharge the inductor. The control circuit increases an electric current flowing to the load terminal through the inductor per one operational cycle as the switching frequency decreases during VFM control mode operation.03-18-2010
20120200275Integrated High-Voltage Power Supply Start-Up Circuit - According to an exemplary embodiment, an integrated start-up circuit for a power supply includes a converter, which in one embodiment can be a buck converter. In one embodiment, the buck converter includes a gate driver configured to drive a power switch, where the power switch is coupled across a DC bus node and a switching node of the buck converter. The power switch is configured to provide a start-up voltage to the buck converter from the DC bus node during start-up of the buck converter. In one embodiment, the buck converter includes a bootstrap switch coupled across the gate driver and a Vcc node and a Schottky diode coupled across the bootstrap switch and the switching node, where the start-up voltage is provided at the Vcc node through the bootstrap switch.08-09-2012
20110175586Switching Regulator and Constant Frequency Compensating Circuit for Fixing Operating Frequency - A switching regulator for fixing a frequency which includes a power stage circuit, comprising an upper gate switch, a lower gate switch and an inductor; a reference voltage generator for generating a reference voltage; a comparator for outputting a comparing result according to the output voltage and the reference voltage; a constant frequency compensating circuit for a control signal according to the comparing result, a phase signal and a compensating signal. The constant frequency compensating circuit comprises a charging capacitor. The phase signal corresponding to the cross voltage of the lower gate bridge, and the compensating signal corresponding to the output voltage, and the constant frequency compensating circuit utilizes the phase signal to initialize a voltage of a terminal of the charging capacitor.07-21-2011
20110101941LOAD DRIVING DEVICE - A load driving device according to an exemplary aspect of the present invention includes: an output transistor coupled between a first power supply line and an output terminal; the output terminal being configured to be coupled with a load; a driver circuit that controls conduction/non-conduction of the output transistor; a compensation transistor that is coupled between the output terminal and a second power supply line, and becomes conductive when the driver circuit renders the output transistor non-conductive and when a potential of the second power supply line reaches a predetermined value or greater, to maintain a non-conduction state of the output transistor; and a first resistor coupled between the second power supply line and a back gate of the compensation transistor.05-05-2011
20110101944VOLTAGE BOOSTING/LOWERING CIRCUIT - A voltage boosting/lowering circuit in accordance with present invention includes an output voltage generation circuit including a first switch element connected between an input terminal and one end of a choke coil and a second switch element connected between the other end of the choke coil and a ground terminal, the output voltage generation circuit being configured to boost or lower an input voltage input to the input terminal and thereby to generate an output voltage by switching the first and second switch elements between an On-state and an Off-state. Further, voltage boosting/lowering circuit includes a clock generation circuit that generates voltage-boosting and voltage-lowering clocks having different timings, and a switch control unit that performs switching control of the first and second switch elements based on the voltage-boosting and voltage-lowering clocks so that negative feedback control is performed so as to bring the output voltage to a target output voltage.05-05-2011
20110101940SEMICONDUCTOR DEVICE AND POWER SUPPLY DEVICE - The present invention realized miniaturization of a power supply device using a multiphase system. The power supply device includes, for example, a common control unit, a plurality of PWM-equipped drive units, and a plurality of inductors. The common control unit outputs clock signals respectively different in phase to the PWM-equipped drive units. The clock signals are controllable in voltage state individually respectively. For example, the clock signal can be brought to a high impedance state. In this case, the PWM-equipped drive unit detects this high impedance state and stops its own operation. It is thus possible to set the number of phases in multiphase arbitrarily without using another enable signal or the like.05-05-2011
20110101942VOLTAGE REGULATOR CIRCUIT - A voltage regulator circuit includes a transistor and a capacitor. The transistor includes a gate, a source, and a drain, a first signal is inputted to one of the source and the drain, a second signal which is a clock signal is inputted to the gate, an oxide semiconductor layer is used for a channel formation layer, and an off-state current is less than or equal to 10 aA/μm. The capacitor includes a first electrode and a second electrode, the first electrode is electrically connected to the other of the source and the drain of the transistor, and a high power source voltage and a low power source voltage are alternately applied to the second electrode.05-05-2011
20110101937Voltage Regulator with Virtual Remote Sensing - An automatic voltage compensation circuit in a voltage regulator compensates the output voltage for a voltage drop along lines leading to a remote load. A load capacitor is connected across the load for providing a low impedance across the load during a test phase of the regulator. In one embodiment, during the test phase, the load current is changed up or down a small percentage (e.g., 10%). As a result, the regulator voltage changes due only to the line resistance since the load is bypassed by the load capacitor. The voltage drop at full load current is then derived by detecting the change in regulator output voltage (a fractional voltage drop) and multiplying it. The normal mode is resumed, and the derived voltage drop is added to the regulator output by either compensating the feedback loop or by adding the voltage drop to the output of the regulator.05-05-2011
20110101938ADAPTIVE-GAIN STEP-UP/DOWN SWITCHED-CAPACITOR DC/DC CONVERTERS - A switched-capacitor DC-DC converter has a reconfigurable power stage with variable gain ratio and/or interleaving regulation for low ripple voltage, fast load transient operation, variable output voltage and high efficiency. Since the power stage has multiple switches per capacitor, the converter exploits reconfigurable characteristics of the power stage for fast dynamic control and adaptive pulse control for tight and efficient voltage regulation.05-05-2011
20100231186SINGLE-INDUCTOR MULTIPLE-OUTPUT POWER CONVERTER - A single-inductor multiple-output power converter includes an inductor having a first terminal and a second terminal. The first terminal of the inductor is coupled to a power input terminal, and the second terminal of the inductor is switched to either of the first terminal of the inductor, multiple power output terminals, and a ground terminal. By switching the second terminal of the inductor between the first terminal of the inductor, the power output terminals, and the ground terminal, the power converter may provide multiple output voltages at the power output terminals respectively, in a less loss and thereby higher efficiency manner.09-16-2010
20100231187SWITCHED MODE POWER SUPPLY WITH CURRENT SENSING - An electronic device for switched mode DC-DC conversion is provided that includes a stage for sensing an output current causing a voltage difference between a first and a second node. The current sensing stage includes a comparator being capacitively coupled with a first input to the first node and with a second input to the second node for determining a magnitude of the output current.09-16-2010
20110074373CONTROL CIRCUIT AND METHOD FOR A BUCK-BOOST POWER CONVERTER - Control signals are generated for a buck-boost power stage of a buck-boost power converter to convert an input voltage to an output voltage. The buck-boost power stage includes an inductor and at least two power switches connected thereto. The output voltage is monitored to generate an error signal having clamped level according to a first detecting signal related to at least one of the input voltage, output voltage and inductor current. In a buck-boost mode, a compensation signal and a duty insertion signal are generated according to a second detecting signal related to at least one of the input voltage, output voltage, inductor current and variation of the output voltage, the error signal is compensated with the compensation signal to generate a compensated error signal, and the control signals are determined upon the combination of the compensated error signal, the duty insertion signal and a ramp signal.03-31-2011
20110074374DRIVING APPARATUS FOR AN ELECTROMAGNETIC LOAD AND RELATED METHOD - A driving apparatus for an electromagnetic load, said apparatus having at least one pair of first and second transistors arranged so as to form a current path with the electromagnetic load for discharging the current produced by the electromagnetic load. The first transistor has an inherent diode between the non-drivable terminals and the apparatus is configured to control switching of the pair of first and second transistors, to diode-connect the second transistor, with said first and second transistors switched off, so that the current produced by said electromagnetic load, crossing said inherent diode, creates an overvoltage between the terminals of the second diode-configured transistor such to exceed the conduction threshold voltage thereof.03-31-2011
20110074372Architecture of a Power Supply Circuit with Power Factor Correction - An improved architecture of a power supply circuit with power factor correction, the power supply circuit includes power supply circuit output terminals and a voltage negative feedback circuit, the power supply circuit output terminals include a high potential terminals and a low potential terminals, the voltage negative feedback circuit includes a first feedback circuit and a second feedback circuit connected in series in order from the high potential terminal to the low potential terminal, a connection point of the first feedback circuit and the second feedback circuit acts as a feedback signal output terminal through which the voltage negative feedback circuit outputs a feedback signal, in the improved architecture, the first feedback circuit is replaced by a light source branch including a constant-current light source, and the second feedback circuit is replaced by a resistor branch for determining a working current of the light source branch. This improved architecture can perform a constant-current supply with high power factor and high efficiency for the light source.03-31-2011
20090027020THRESHOLD VOLTAGE MONITORING AND CONTROL IN SYNCHRONOUS POWER CONVERTERS - A method of providing threshold voltage monitoring and control in synchronous power converters is disclosed. The method establishes a threshold voltage level for at least one of an upper gate and a lower gate power switch in a synchronous power converter. The threshold voltage levels indicate switching delay times are present in the upper and lower gate power switches. The method detects body diode conduction levels for both the upper and lower gate power switches. When at least one of the detected body diode conduction levels exceed a prescribed body diode conduction level, the method adjusts the threshold voltage level for at least one of the upper and lower gate power switches to reduce a body diode conduction time for the at least one of the upper and lower gate power switches.01-29-2009
20100244798DC-DC CONVERTER AND POWER SUPPLYING SYSTEM USING SAME - A DC-DC converter includes first and second capacitors connected in series, a switching part, and a control circuit part which includes a voltage difference calculating part for calculating a difference between voltages of the first and second capacitors, a duty ratio controller for controlling duty ratio of on- and OFF-durations to decrease the voltage difference of the first and second capacitors on the basis of the calculated difference. A power supplying system including the DC-DC converter controls balance between first and second capacitors in voltage on the basis of the powering/regenerating discriminating signal.09-30-2010
20100301820HIGH WITHSTAND VOLTAGE SEMICONDUCTOR DEVICE AND CURRENT CONTROL DEVICE USING THE SAME - To provide a high withstand voltage semiconductor device capable of accurately detecting a switch between a MOS operation and an IGBT operation, and thereby achieving a low-loss drive, and a current control device using the same. The semiconductor device includes: an N-type resurf region 12-02-2010
20110248694SOFT SWITCHING APPARATUS, METHOD, AND POWER CONVERSION SYSTEM - Soft switching apparatus, method, and power conversion system are disclosed. The apparatus includes a main switching unit and a buffer unit for adjusting a voltage level of a switching signal, in order to change an internal resistance of the main switching unit and to reduce the sudden change to a voltage and a current flowing through the main switching unit.10-13-2011
20130162234BUCK REGULATION OF A BOOST REGULATOR - Buck regulation methods are provided for a boost regulator to convert an input voltage into an output voltage lower than the input voltage. The buck regulation methods can reduce the variation of the inductor current of the boost regulator, and thereby decrease power consumption and increase the efficiency of the boost regulator under buck regulation.06-27-2013
20100264890Voltage and Current Regulators with Switched Output Capacitors For Multiple Regulation States - A device and method of providing any one of a plurality of desired levels of a regulated signal output to a load is described, wherein each desired level is a function of a corresponding reference signal. The device is configured and the method is designed to (1) store each desired level of the regulated signal output on a switchable storage device; and (2) selectively switch the correct storage device to the output when switching from one regulated state to another so as to establish the desired level of regulated signal output.10-21-2010
20100295524LOW DROP-OUT DC VOLTAGE REGULATOR - A low drop-out DC voltage regulator comprising an output pass element for controlling an output voltage (v) of power supplied from a power supply through the output pass element to a load (R), a source of a reference voltage (v), and a feedback loop for providing to the output pass element a control signal tending to correct error in the output voltage. The feedback loop includes a differential module responsive to relative values of the output voltage (v) and the reference voltage (v) and an intermediate module driven by the differential module for providing the control signal. The differential module presents the widest bandwidth of the modules of the regulator and the differential module presents a frequency pole that is higher than the cut-off frequency of the regulator, at which its regulation gain becomes less than one.11-25-2010
20100295521DC/DC Converter Within a Portable Computer - A DC/DC converter is disclosed. The DC/DC converter includes a first heavy-load electronic switch and a second heavy-load electronic switch connected in series between an input terminal and ground at a first output portion, a third light-load electronic switch and a fourth light-load electronic switch connected in series between the input terminal and ground at a second output portion, an output circuit, an output current measurement circuit, and a control circuit. The output circuit includes an inductor connected to the first and second output portions. The output current measurement circuit measures an output current. The control circuit, in response to an output of the output current measurement circuit, selects a combination of the first and second heavy-load electronic switches during a heavy load state, and selects a combination of the third and fourth light-load electronic switch during a light load state.11-25-2010
20110254522STANDBY POWER SUPPLY CIRCUIT - A standby power supply circuit includes a pulse width modulation controller, first to fourth metal-oxide-semiconductor field effect transistors (MOSFETs), and an inductor. A gate of the first MOSFET and a gate of the second MOSFET are connected to a first and a second general purpose terminals of a power management chip, respectively. A drain of the first MOSFET is connected to a source of the third MOSFET. A gate of the fourth MOSFET is connected to a lower gate terminal of the controller. A phase terminal of the controller is grounded via the inductor and a capacitor in series. The drain of the second MOSFET is connected to a node between the inductor and the capacitor via a resistor.10-20-2011
20100253301OSCILLATOR CIRCUIT - A first capacitor is arranged such that the electric potential at a first terminal is fixed. A first discharging circuit discharges the first capacitor at a timing that corresponds to a cyclic synchronization signal received from an external circuit. A first comparator compares the voltage at a second terminal of the first capacitor with a predetermined threshold voltage, and generate a judgment signal that corresponds to the comparison result. A charging circuit generates a charging current the current value of which is adjusted according to the level of the judgment signal at a timing that corresponds to the synchronization signal, and supplies the charging current thus generated to the first capacitor.10-07-2010
20090302814SYSTEM AND METHOD FOR CONTROLLING A CONVERTER - A system and method for controlling a converter. One embodiment provides the cyclic actuation of a first switching element, used for applying an input voltage to an inductive storage element. A second switching element is used as a first rectifier element in a rectifier arrangement, in a step-up converter. An actuating circuit is provided for the first and second switching elements.12-10-2009
20090289609POWER SUPPLY, TESTER, AND STABILIZER - Provided is a power supply apparatus including a low pass filter that receives an output voltage of a current output section and allows a low frequency component with a frequency lower than a preset cutoff frequency to pass through; an excess voltage restricting load section that consumes an excess voltage restricting current, which is at least a portion of the output current from the current output section, when a load is turned on; and an excess voltage restricting control section that keeps the excess voltage restricting load section turned off when the output voltage of the current output section is less than an upper reference voltage, which is obtained by adding together a voltage output by the low pass filter and a preset upper offset voltage.11-26-2009
20090284236CONSTANT CURRENT SOURCE APPARATUS - A constant current source apparatus is provided that includes a complementary switching section that selectively outputs a reference voltage or a driving voltage according to a control signal and a constant current source circuit that causes a constant current determined by the reference voltage to flow to a load in a case where the reference voltage is received from the complementary switching section and cuts off the current flowing to the load in a case where the driving voltage is received from the complementary switching section. The complementary switching section includes a first FET in which one of either a source or a drain is connected to the driving voltage, the other source or drain is connected to an output end of the complementary switching section, and a gate receives the voltage according to the control signal and a second FET that switches to an opposite polarity of the first FET in which one of either a source or a drain is connected to the reference voltage, the other source or drain is connected to the output end of the complementary switching section, and a gate receives the voltage according to the control signal.11-19-2009
20090243575SEMICONDUCTOR DEVICE AND POWER SUPPLY USING THE SAME - A semiconductor device for control applied to a constant-voltage power supply device includes a digital-analog converter circuit which outputs a reference voltage corresponding to a value of a first register with taking an output voltage of a reference voltage source as a criterial reference voltage, and generates a control signal for driving a power semiconductor device based on an output voltage of an error amplifier which differentially amplifies a feedback voltage obtained by resistive-dividing on an output voltage of the constant-voltage power supply device and the reference voltage. An analog-digital converter circuit which converts the feedback voltage to a digital value with taking the output voltage of the constant-voltage power supply device as a reference voltage is provided, and based on the output, a value of a first register is corrected so as to offset an effect of an error in voltage dividing ratio of a voltage dividing resistor circuit.10-01-2009
20110254521FLOATING-GATE PROGRAMMABLE LOW-DROPOUT REGULATOR AND METHODS THEREFOR - In an embodiment, a low-dropout (LDO) regulator includes at least one of a programmable voltage reference and a programmable frequency compensation circuit and is configurable to produce an output voltage. The programmable voltage reference includes a floating-gate transistor coupled to a reference output and configurable for providing a reference voltage to an input of an error amplifier. The programmable frequency compensation circuit is responsive to a programmable current reference circuit that includes at least one floating-gate transistor that is configurable to adjust a frequency compensation parameter. A control circuit is provided to selectively program floating gates of the floating gate transistors to adjust the output voltage and/or to adjust a frequency component of the output voltage.10-20-2011
20090140708DC to DC converter with Pseudo Constant Switching Frequency - Various apparatuses, methods and systems for a DC to DC converter with a pseudo constant switching frequency are disclosed herein. For example, some embodiments provide a DC to DC converter having a switch connected to a switching node to control a voltage of the switching node, and a switching controller that is adapted to turn on and off the switch at a substantially constant frequency based at least in part on the voltage of the switching node. The switching controller includes a modulator connected to a control electrode of the switch and that is adapted to actuate and deactuate the switch, and a first timer that is connected to the switching node and to the modulator. The first timer uses the voltage of the switching node to determine an on-time for the switch.06-04-2009
20080303500DC-DC CONVERTER AND CONTROL METHOD THEREOF - A first power supply line and having a first conductivity type a second transistor coupled between the first transistor and a second power supply line, and having the first conductivity type an output unit driving a first control signal causing the first transistor to become conductive, based on a drive voltage, and outputting the first control signal to the first transistor and a boot strap circuit including a capacitor having a first end coupled to a node of the first transistor and the second transistor and supplying the output unit with the drive voltage based on the capacitor, wherein an electric potential of the first end is reduced before the first transistor becomes conductive.12-11-2008
20120242310DC-DC CONVERTER - The high-side switch has one end connected to the input terminal. The low-side switch has one end connected to other end of the high-side switch and other end connected to a ground terminal. The inductor has one end connected to the other end of the high-side switch and other end connected to the output terminal. The capacitor has one end connected to the other end of the inductor and other end connected to the ground terminal. The high-side switch controlling circuit generates and supplies a high-side switch controlling signal based on a target voltage of the output terminal, the output voltage of the output terminal, and a current flowing through the capacitor, to the high-side switch. The low-side switch controlling circuit generates and supplies a low-side switch controlling signal based on the high-side switch controlling signal and a current flowing through the inductor, to the low-side switch.09-27-2012
20110001459CIRCUIT ARRANGEMENT FOR CONTROLLING AN INDUCTIVE LOAD - A circuit for controlling an inductive load, e.g. of a fuel injection valve, includes supply terminals for supplying a voltage, output terminals for connecting the load, and a detection device which is connected to at least one of the output terminals and is used for detecting the point in time at which the operation of the load is discontinued and/or detecting at least one fault case during a non-operational phase of the load. In order to render the detection process more reliable while using less circuitry, the detection device encompasses a current mirror with a first current source and a second current source. The current first is connected to one of the two output terminals during a detection phase. The current supplied by the second current source is evaluated as a signal of the detected result.01-06-2011
20080252276Method of Forming a Buck-Boost Mode Power Supply Controller and Structure Therefor - In one embodiment, a power supply controller is configured to operate a plurality of switches in a buck-boost mode to control an output voltage wherein at least one switch of the plurality of switches is enabled for a substantially fixed portion of a cycle of the buck-boost mode.10-16-2008
20080252275Determining average output current in DC-DC converter - A switching circuit for converting an input voltage into an output voltage has an input terminal for receiving the input voltage. A power switching element is coupled to the input terminal and has duty cycle d controllable to adjust the output voltage with respect to a desired level using inductor current representing current in an inductor element connectable to the power switching element. An average and hold circuit is responsive to a voltage at an output of the power switching element to produce an average switch voltage over an ON phase of a switching cycle of the power switching element. A voltage-to-current converter is responsive to the average switch voltage for producing representation of an average inductor current over one or more switching cycles. A current modulator having a duty cycle equal to 1-d modulates the representation of the average inductor current to produce a signal proportional to an average output current of the switching circuit over one or more switching cycles.10-16-2008
20080252274Pseudo Fixed Frequency Switch-Mode DC/DC Voltage Regulator Control Method - A method for controlling a step down regulator includes (a) generating a first feedback signal as a function of the voltage at the output node; (b) generating a second feedback signal as a function of the voltage at the input node; (c) maintaining the on-time of the low-side switch at a fixed duration; and (d) varying the on-time of the high-side switch to be proportional to the first feedback signal and inversely proportional to the second feedback signal so that the switching frequency of the high and low side switches is approximately constant.10-16-2008
20100277150SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD THEREOF - A semiconductor device is disclosed. The semiconductor device includes a switching signal generating circuit formed of a PMOS transistor, a resistor, and inverters which outputs an internal switching signal for switching an operating mode between a first operating mode and a second operating mode when an operating state satisfies a predetermined condition, a mode selection pad to which an external switching signal capable of selecting the first operating mode is input in priority to the internal switching signal, and a switching circuit formed of an OR circuit which switches the operating mode between the first operating mode and the second operating mode based on the external switching signal or the internal switching signal. An output from the switching signal generating circuit is input to the mode selection pad via a trimming fuse.11-04-2010
20080203988Adder and current mode switching regulator - Provided is an adder in which all of circuits can be constituted by CMOS transistors, a process is simplified, and a chip size can be reduced as compared with a conventional art. The adder according to the present invention includes: a first VI converter and a second VI converter that allow a current corresponding to an input voltage to flow therein; and a current addition resistor having one end commonly connected to output terminals of the first VI converter and the second VI converter and another end grounded, which is adjustable in a resistance value. Each of the first VI converter and the second VI converter includes: a prestage VI converter that generates a reference current; a poststage VI converter that generates a current corresponding to the input voltage; a first current mirror circuit whose first terminal on a reference side is connected with the prestage VI converter and whose first output terminal in which a current corresponding to the first terminal flows is connected with the poststage VI converter; and a second current mirror circuit whose second terminal on the reference side is connected to the first output terminal, and which can adjust a current ratio from a second output terminal in correspondence with the current that flows in the second terminal. A voltage at the one end of the current addition resistor is output as an addition voltage.08-28-2008
20100320979CURRENT CONTROL SYSTEMS WITH CURRENT FEEDBACKS - A current control system includes a first switch, a second switch, and a controller. The second switch is coupled in parallel with the first switch and operable for providing a feedback signal indicative of a current flowing through the first switch. The feedback signal is determined by a width-to-length ratio of the first switch and a width-to-length ratio of the second switch. In addition, the controller is coupled to the first and second switches and operable for adjusting the current according to the feedback signal.12-23-2010
20100320981POWER CONTROL CIRCUIT, POWER SUPPLY DEVICE, AND ELECTRONIC DEVICE - A power control circuit includes a control circuit configured to perform a soft start operation before a power supply device performs a normal operation. The power control circuit also includes a counter circuit configured to divide a switching frequency of the power supply device in the normal operation, wherein the counter circuit measures a period of the soft start operation and when the period lasts for a set length, starts to divide the switching frequency, and wherein the power control circuit causes a comparator comprising the counter circuit to compare the frequency obtained by dividing the switching frequency with a reference frequency and corrects the switching frequency.12-23-2010
20100320980OUTPUT DEVICE - An output device includes an output transistor that outputs an output current, a first driver that drives the output transistor so that a feedback voltage of an output voltage of the output transistor is in agreement with a reference voltage, an RC circuit that has a capacitor connected to the ground and a resistor connected in series to the capacitor, and a second driver that drives the output transistor to increase the output current when a potential difference between ends of the resistor, generated by the feedback voltage supplied between ends of the RC circuit, is increased by a decrease of the output voltage.12-23-2010
20110163732Synchronous buck converter using shielded gate field effect transistors - A synchronous buck converter includes a high-side switch and a low-side switch serially coupled to one another. The low-side switch includes a field effect transistor that comprises: a trench extending into a drift region of the field effect transistor; a shield electrode in a lower portion of the trench, wherein the shield electrode is insulated from the drift region by a shield dielectric; a gate electrode in the trench over the shield electrode, wherein the gate electrode is insulated from the shield electrode by an inter-electrode dielectric; source regions adjacent the trench; a source metal contacting the source regions; and a resistive element having one end contacting the shield electrode and another end contacting the source metal in the field effect transistor.07-07-2011
20130169251VOLTAGE REGULATOR WITH IMPROVED VOLTAGE REGULATOR RESPONSE AND REDUCED VOLTAGE DROP - A voltage regulator includes an output drive device configured to provide an output voltage to an output terminal; an error amplifier configured to control the output drive device by taking into consideration a feedback signal from the output voltage; a first compensation unit configured to provide a first compensation signal to compensate an output signal of the error amplifier; and a second compensation unit configured to provide a second compensation signal to compensate an input signal of the error amplifier, wherein second compensation unit comprises at least two capacitors and at least one transistor configured to control the coupling of the two capacitors.07-04-2013
20130169252Switching Regulator and Control Circuit and Control Method Thereof - The present invention discloses a switching regulator and a control circuit and a control method thereof. The switching regulator generates a compensation signal according to a feedback signal, and generates a driving signal according to the compensation signal, to control a power stage for converting an input voltage to an output voltage. The compensation signal is adjusted according to the input voltage, such that when the input voltage is equal to or lower than a predetermined level, the compensation signal is kept at a predetermined value.07-04-2013
20100283439EFFICIENT SWITCH CASCODE ARCHITECTURE FOR SWITCHING DEVICES - Efficient switch cascode architecture for switching devices, such as switching regulators. The cascode architecture includes a switching stage responsive to an external driver signal for switching transitions, and a bias generator operative to bias the cascode transistor of the switching stage to protect the switching stage from damage during the switching transitions.11-11-2010
20120262140Voltage Sag Corrector Using a Variable Duty Cycle Boost Converter - A sag corrector apparatus for providing voltages temporarily (ride-through) to a load during momentary electrical disturbances in the power supply line. In one embodiment, the disclosed apparatus compensates for voltage sags by using a variable duty cycle boost converter to boost the sagged line voltage to resemble desired voltage levels during occurrence of voltage sags. The boosted voltage available to a connected load during a sag depends on a sequence of operation of various control pulses. Duty cycle of the boost converter is controlled by changing the width (duration) of the control pulses. To prevent voltage shoot-throughs from over-boosting, an energy clamp circuit is provided to dissipate excess energy. Embodiments of the sag corrector circuit can be additionally integrated with power protection functions.10-18-2012
20120262139SYSTEM AND METHOD FOR ACTIVE ELECTROMAGNETIC INTERFERENCE REDUCTION FOR A SWITCHING CONVERTER - An EMI reduction network for a converter, the converter including upper and lower power switches provided between an input voltage node and a reference node. An inductance is coupled between the input voltage node and the upper switch at a first node, a capacitance and an auxiliary power switch are coupled in series between the first and reference nodes, and a controller is provided to control switching. The controller switches the upper switch based on a PWM signal. The controller keeps the lower switch turned on until the phase node goes positive while the upper switch is on. The controller turns the auxiliary switch on after the lower power switch is turned off and turns the auxiliary switch off after the upper power switch is turned off The lower and auxiliary switches may be zero voltage switched, and the upper switch may be zero current switched.10-18-2012
20080272755SYSTEM AND METHOD WITH INDUCTOR FLYBACK DETECTION USING SWITCH GATE CHARGE CHARACTERISTIC DETECTION - A method and system monitor gate charge characteristics of one or more field effect transistors in a switching power converter to detect an end of an inductor flyback time interval. The switching power converter includes a switch coupled to an inductor to control current flow in the inductor. When the switch turns OFF, a collapsing magnetic field causes the inductor current to decrease and the inductor voltage to reverse polarity. When the magnetic field completely collapses, the inductor current goes to zero. At the end of the inductor flyback time interval, a voltage is induced across a Miller capacitance of the switch. The voltage can be detected as a transient change in the gate voltage of the switch. A switch gate sensor detects the gate voltage change associated with the end of the inductor flyback time interval and provides a signal indicating an end of the inductor flyback time interval.11-06-2008
20110254524CURRENT DRIVER CIRCUIT - In order to provide a current driver circuit capable of achieving a stable operation without feeding a load current back, a current driver circuit of the present invention includes: a converter part (10-20-2011
20100225290CRITICAL CONDUCTION RESONANT TRANSITION BOOST POWER CIRCUIT - A boost regulator is provided that has increased efficiency. The increased efficiency is provided by incorporating a sensing circuit that senses when the current in the boost regulator's inductor is near zero or when the voltage at its switching node is near zero or virtual ground. A switching signal is provided to the boost regulator's switching transistor when the near zero current or voltage is sensed. Switching at the near zero current or voltage moment (the “critical conduction moment”) helps to eliminate or minimize the power loss associated with switching the transistor at a time other than during the critical conduction moment.09-09-2010
20110254523POWER SOURCE CIRCUIT - An object is to reduce degradation of circuit operation and to reduce the area of the entire circuit. A power source circuit is provided with a first terminal to which first voltage is input; a second terminal to which second voltage is input; a comparator being connected to the first terminal and the second terminal and comparing the first voltage and the second voltage; a digital circuit averaging, integrating, and digital pulse width modulating a first digital signal output from the comparator; a PWM output driver amplifying a second digital signal output from the digital circuit; and a smoothing circuit smoothing the amplified second digital signal.10-20-2011
20100176779Power supply device and electronic apparatus - A power supply device includes: a power supply plane to which a processing circuit is electrically connected to supply electrical power to the processing circuit and in which the processing circuits are connected to each supply place; plural OBP's each of which applies a voltage to the power supply plane to supply electrical power to the processing circuits via the power supply plane; and a power supply control section which controls an application voltage in individual one of the OBP's by reflecting a status of power supplying in other OBP's other than the individual one out of the plural OBP's to uniform a dispersion of voltages between the supply places.07-15-2010
20100117612DC-TO-DC CONVERTER COMPRISING A RECONFIGURABLE CAPACITOR UNIT - The present invention relates to a configurable trench multi-capacitor device comprising a trench in a semiconductor substrate. The trench has a lateral extension exceeding 10 micrometer and a trench filling includes a number of at least four electrically conductive capacitor-electrode layers. A switching unit is provided that comprises a plurality of switching elements electrically interconnected between different capacitor-electrode layers of the trench filling. A control unit is connected with the switching unit and configured to generate and provide to the switching unit respective control signals for forming a respective one of a plurality of multi-capacitor configurations using the capacitor-electrode layers of the trench filling.05-13-2010
20100117613CURRENT DIRECTION DETECTION CIRCUIT AND SWITCHING REGULATOR HAVING THE SAME - A switching regulator includes a first transistor and a second transistor connected in series between an input voltage and a reference voltage, an output terminal arranged to output an output voltage in accordance with a voltage appearing at a first connection point between the first and second transistors, a first control circuit arranged to output a first control signal and a second control signal to alternately turn on and off the first and second transistors, respectively, in accordance with the output voltage at the output terminal, a third transistor connected in parallel with the second transistor between the first connection point and the reference voltage, the third transistor being arranged to be controlled by the second control signal in common with the second transistor, an impedance element located between the third transistor and the reference voltage, and a second control circuit arranged to output a third control signal to turn off the second transistor prevailing over the second control signal in accordance with a voltage appearing at a second connection point between the third transistor and the impedance element.05-13-2010
20100117611Regulator circuit having N-type MOS transistor controlled by error amplifier - A regulator circuit includes a direct-current voltage conversion circuit which receives a first power supply voltage, and generates a second power supply voltage by stepping down a first power supply voltage, and an error amplifier that operates based on the first power supply voltage, and outputs an output control signal by comparing a feedback voltage that varies depending on an output voltage outputted from an output terminal and a reference voltage. The regulator circuit includes an N-type MOS transistor including a drain supplied with the second power supply voltage, a source connected to the output terminal, and a gate receiving the output control signal.05-13-2010
20110080147METHOD FOR OPERATING AN INVERTER, AND INVERTER - In an inverter and a method for operating an inverter, the inverter includes a step-up converter circuit, a dynamic intermediate circuit, and a step-down converter circuit for converting a direct voltage of a direct voltage generator or string into an alternating voltage for supplying a network. The step-up converter circuit increases the direct voltage if the latter is lower than a peak-to-peak maximum of the network voltage, and the step-down converter circuit lowers a dynamic intermediate circuit voltage, as needed, to a lower voltage currently required in the network. The step-up converter circuit dynamically increases the direct voltage to the value currently required in the network and in the process temporarily supplies an approximately sinusoidal voltage curve for the intermediate circuit voltage.04-07-2011
20110095739SEPARATE TYPE CONVERTER HAVING RELATIVELY BETTER EFFECTIVENESS - A separate type converter is provided. The separate type converter includes a power control module having a power control circuit generating a first control signal, and a power stage module having a power stage circuit coupled to the power control circuit for receiving the first control signal and an input voltage, and generating an output voltage, in which the power control module and the power stage module are separate from each other in an assembling structure.04-28-2011
20110095738SEMICONDUCTOR DEVICE - A semiconductor device according to an exemplary embodiment of the present invention includes a discharge circuit and a control circuit. The discharge circuit includes a first transistor connected between a gate of an output transistor and an output terminal, and a capacitor connected to a gate of the first transistor, and discharges a gate voltage of the output transistor to the output terminal by turning on the first transistor with an electric charge of the capacitor. The control circuit includes a charge path, a first discharge path, and a second discharge path. The first discharge path discharges an electric charge of the charged capacitor when the system turns off. The second discharge path discharges the electric charge of the capacitor for a time period longer than a time period for discharging the output transistor by the discharge circuit upon detection of an abnormality in the system.04-28-2011
20100134079ANALOG VARIABLE-FREQUENCY CONTROLLER AND SWITCHING CONVERTER THEREWITH - An analog variable-frequency controller includes a first current generator, a second current generator, a clock generator and a light/heavy load selector. The first and second current generator receive a load current signal and then output a first voltage signal and a second voltage signal, respectively. The clock generator generates a corresponding switching frequency according to the first voltage signal or the second voltage signal. The light/heavy load selector, connected with the first current generator, the second current generator and the clock generator, receives a control signal for controlling the clock generator to receive the first voltage signal or the second voltage signal. The abovementioned controller is implemented by an analog circuit, which has a lower circuit complexity, lower cost and is easy to be integrated into a switching converter.06-03-2010
20100060250CURRENT-MODE CONTROL TYPE DC-DC CONVERTER AND CONTROL METHOD THEREFOR - A current-mode control type DC-DC converter includes a switching transistor turned on with a clock signal output in predetermined cycles, an inductor supplied with electric current when the switching transistor is turned on, an error amplifier circuit to output an error voltage that is an amplified difference between a predetermined reference voltage and a divided output voltage of the DC-DC converter, a slope voltage generation circuit to generate a slope voltage by performing slope compensation on an inductor current, a PWN comparator to compare the slope voltage with the error voltage and generate a reset pulse to turn off the switching transistor when the slope voltage reaches the error voltage, and a slope voltage maintenance mechanism to keep the slope voltage at the ground voltage from when the reset pulse is generated to when a subsequent clock signal is generated.03-11-2010
20100060252POWER SUPPLY APPARATUS SUPPLYING POWER STORED IN POWER STORAGE UNIT TO LOAD AND POWER SUPPLY SYSTEM INCLUDING POWER SUPPLY APPARATUS - A power supply apparatus converting electric power stored in a first power storage unit into a prescribed voltage for supply to a load includes: a power storage unit-side terminal coupled to the first power storage unit; a second power storage unit; a load-side terminal coupled to the load; a converter unit for increasing output voltage of the first power storage unit to a first voltage and outputting the first voltage to the load-side terminal at a time of discharging of the first power storage unit; a step-up circuit for increasing the output voltage of the first power storage unit and supplying the increased voltage to the second power storage unit; and a backflow prevention circuit arranged between the second power storage unit and the load-side terminal to allow current to flow from the second power storage unit to the load-side terminal and block current flowing from the load-side terminal to the second power storage unit.03-11-2010
20100060251Step-Up Switching Power Supply Circuit - A step-up switching power supply circuit is provided. Within a delay period immediately after start of operation, a switching element (SW03-11-2010
20080218142Current detector circuit and current mode switching regulator - A current detector circuit is completely formed of CMOS transistors, and is simplified in process, and can be reduced in the chip size. The current detector circuit of the present invention generates a sense voltage that corrects a voltage for slope compensation according to a coil current in a current mode switching regulator. The current detector circuit includes: a first p-channel transistor which allows a current of 1/N of a current which flows through a transistor that drives a coil to flow therein; a second p-channel transistor having a source connected to a drain of the first p-channel transistor; a third p-channel transistor connected to a drain of a transistor in which the coil current flows; a voltage mirror circuit having one terminal connected to a drain of the second p-channel transistor, and another terminal connected to a drain of the third p-channel transistor, in which voltages at both of the terminals are identical with each other; and a first n-channel transistor having a drain connected to the drain of the first p-channel transistor, and a source grounded through a sense resistor.09-11-2008
20080218141Circuit for charging a bootstrap capacitor in a voltage converter - For charging a bootstrap capacitor in a voltage converter, a circuit is provided for wider bandwidth to eliminate the feedback stability issue and pin out for compensation circuit. A pair of transistors are connected in series between a power input and the bootstrap capacitor, the first transistor is switched synchronously with a low-side transistor of the voltage converter, and a comparator compares a feedback voltage drawn from a feedback node between the pair of transistors with a reference voltage, to control the second transistor to determine to charge the bootstrap capacitor.09-11-2008
20080218140Control apparatus for cooler - The present invention discloses a control apparatus, which integrates the methods of PWM signal controlling and manual voltage regulating for controlling the cooler. The control apparatus includes a voltage stabilizer, a voltage regulator, and a switching unit. The voltage stabilizer connects to a CPU of a motherboard for receiving a PWM signal and outputting a stable PWM signal. The voltage regulator connects to the voltage stabilizer for regulating the voltage level of the stable PWM signal. The switching unit connects to the voltage stabilizer, the voltage regulator and the cooler for performing a switching operation between a first control mode and a second control mode. Moreover, the control apparatus controls the cooler via the stable PWM signal in the first control mode, and controls the cooler by regulating the voltage level of the stable PWM signal in the second control mode.09-11-2008
20100194365METHOD AND APPARATUS TO REDUCE MAXIMUM POWER FROM A POWER SUPPLY WITH TRANSITION REGION REGULATION - Techniques are disclosed to regulate the output power of a power supply. An example feedback circuit for use in a power supply regulator includes a voltage regulation circuit coupled to sense an output voltage of the power supply regulator. The voltage regulation circuit is coupled to generate a first regulation signal to regulate an output of the power supply regulator if an output current of the power supply is less than a first transition current. A current regulation circuit is coupled to sense an output current of the power supply regulator. The current regulation circuit is coupled to generate a second regulation signal to regulate the output of the power supply regulator if the output voltage of the power supply is less than a second transition voltage. A transition region regulation circuit is coupled to sense the output voltage and the output current of the power supply regulator. The transition region regulation circuit is coupled to generate a third regulation signal to regulate the output of the power supply regulator if the output current of the power supply is between the first transition current and a second transition current. The feedback circuit is coupled to generate a feedback signal output in response to the first, second and third regulation signals.08-05-2010
20100194361ASYMMETRIC TOPOLOGY TO BOOST LOW LOAD EFFICIENCY IN MULTI-PHASE SWITCH-MODE POWER CONVERSION - Techniques for performing DC to DC power conversion in switch-mode converter circuits include combinations of dynamic switch shedding, phase shedding, symmetric phase circuit topologies, and asymmetric phase circuit topologies. In at least one embodiment of the invention, a method of operating a power converter circuit includes operating a first phase switch circuit portion using a first number of switch devices when the power converter circuit is configured in a first mode of operation. The first number is greater than zero. The method includes operating the first phase switch circuit portion using the first number of switch devices when the power converter circuit is configured in a second mode of operation. The method includes operating a second phase switch circuit portion using a second number of switch devices when the power converter circuit is configured in the second mode of operation. The second number is greater than the first number.08-05-2010
20090201000Synchronous Rectification Switching Regulator, Control Circuit Thereof, and Method of Controlling the Operation Thereof - A synchronous-rectification-type switching regulator is disclosed that includes a first switching element; an inductor charged with a voltage input to an input terminal of the switching regulator by the switching of the first switching element; a second switching element for synchronous rectification performing switching so as to discharge the inductor; a control circuit part controlling the switching of the first switching element so that an output voltage from an output terminal of the switching regulator is a predetermined constant voltage, and to cause the second switching element to perform the switching inversely to the first switching element; and a reverse current prevention circuit part interrupting a current that flows into the second switching element by cutting off the connection of the second switching element so as to prevent generation of a reverse current that flows in the direction of the second switching element from the output terminal.08-13-2009
20110187338Controlled Current Source and Method for Sourcing a Current - A controlled current source comprises a signal input to receive a control input bus signal (D08-04-2011
20110187337BOOST TYPE POWER CONVERTING APPARATUS - A boost type power converting apparatus is disclosed. The boost type power converting apparatus includes a boost type power converting circuit and a protection circuit. The boost type power converting circuit receives an input voltage and generates an output signal at an output terminal thereof according to the input voltage, and outputs the output signal to a load. The protection circuit is coupled between the boost type power converting circuit and the load in serial to form an electrical loop, and turns on or off the electrical loop according to the output signal.08-04-2011
20110187336NON-INVERTING BUCK BOOST VOLTAGE CONVERTER - A non-inverting buck boost voltage converter includes a buck boost voltage regulation circuitry for generating a regulated output voltage responsive to an input voltage. A current sensor monitors an input current to the buck boost voltage regulation circuitry. Buck boost mode control circuitry controls the buck boost voltage regulation circuitry using peak current mode control in a buck mode of operation and valley current mode control in boost mode of operation responsive to the monitored input current.08-04-2011
20110148375Power amplifying circuit, DC-DC converter, peak holding circuit, and output voltage control circuit including the peak holding circuit - A power amplifying circuit includes a first field effect transistor and a second field effect transistor that are connected in series, are interposed between a high potential power line and a low potential power line, and drive a load; a predriver that generates, in response to an input signal, gate voltages applied to the first field effect transistor and the second field effect transistor respectively; and a variable power source that supplies source voltages to the high potential power line and the low potential power line respectively, and is configured to control the source voltages.06-23-2011
20110148373CONTINUOUSLY SWITCHING BUCK-BOOST CONTROL - A buck-boost converter with a switch controller may cause switches A, B, C, and/or D to cyclically close such that switches B and C are closed during at least one interval of each cycle during both the buck and boost modes of operation. The switch controller may in addition or instead cause switches A, B, C, and/or D to cyclically close based on a control signal such that switches A and D are closed during an interval of each cycle and such that these intervals are never both simultaneously modulated by a small change in the control signal during any mode of operation.06-23-2011
20110148376MOSFET WITH GATE PULL-DOWN - A MOSFET main switch transistor has a pull-down FET coupled between a drain thereof and the gate of the main switch transistor. A gate of the pull-down FET is coupled to the drain of the main switch transistor by a capacitor and is connected to a source thereof by a resistor. The pull-down FET is operated by capacitive coupling to the voltage drop across the main switch and can be used to hold the gate of the main switch transistor at or near its source potential to avoid or reduce unintentional turn-on of the main switch transistor by the Miller effect.06-23-2011
20110148374CONTROL MULTIPLEXOR FOR A SWITCH MODE POWER SUPPLY - A digital circuit directs operation of a pulse width modulation or pulse frequency modulation controller varying its control between closed loop and open loop topology. An exemplary control plant could embody a step-down switch mode power supply providing a precise sequence of voltages or currents to any of a variety of loads such as the core voltage of a semiconductor unique compared to its input/output ring voltage. A state machine monitors pulse width or pulse frequency from the pulse width modulation or pulse frequency modulation controller, respectively, while either type of controller operates in its closed loop topology, to determine if the present power state of the system matches the predicted load as characterized from a predetermined model used in conjunction with design automation tools. The state machine averages pulse widths or pulse frequencies monitored in the closed loop topology. If the average deviates from the predicted pulse width or pulse frequency for the present power state, the state machine updates a corresponding value in a table of pulse width or pulse frequency values from which an open loop controller applying pulse width modulation or pulse frequency modulation, respectively, generates a near critical damped step response during system power state transitions or maintains a maximally flat voltage during system current transients.06-23-2011
20100039083BOOTSTRAP SUPPLY FOR SWITCHED MODE POWER CONVERTER - A power converter controller is operable to control power provided to a load circuit coupled between a first voltage supply terminal and a first switching element by controlling the first switching element and to control power provided to an energy storage element coupled to the first switching element. The energy storage element is operable to provide a power supply. A first control terminal couples to a control input of the first switching element. A first load terminal couples to the first switching element and the charge storing element. A second switching element couples between the first load terminal and a second voltage supply terminal. Timing logic is operable to selectively provide a control signal at the first control terminal to control the first switching element and to selectively control the second switching element to supply power to the load circuit during a load powering phase by enabling the first and second switching elements, charge the energy storage element during a bootstrap charging phase by enabling the first switching element and disabling the second switching element, and allowing the load circuit to operate in isolation during a passive phase by disabling at least the first switching element.02-18-2010
20100026259DC-DC CONVERTER INTEGRATED CIRCUIT AND DC-DC CONVERTER - A DC-DC converter integrated circuit includes: a switching terminal; a feedback terminal; a high-side transistor operable to output a voltage through the switching terminal in ON state; a voltage sensor operable to compare voltage at the switching terminal with a first reference voltage; an error amplifier operable to generate an error signal from voltage at the feedback terminal and a second reference voltage; and a control circuit on detecting the voltage at the switching terminal higher than the first reference voltage in OFF state of the high-side transistor using the voltage sensor, operable to make the high-side transistor turn off in a next period after detecting the voltage at the feedback terminal higher than the second reference voltage using the error signal, and turn on in a next period after detecting the voltage at the feedback terminal lower than the second reference voltage using the error signal.02-04-2010
20100026258SEMICONDUCTOR INTEGRATED CIRCUIT - The present invention provides a semiconductor integrated circuit which can reduce power consumption without hampering operation of a CPU. A power supply control circuit 02-04-2010
20100026256Switching regulator and control method thereof - A switching regulator may operate in a synchronous mode or an asynchronous mode. When the load current is higher than a threshold, the switching regulator switches a pair of serially connected high side and low side switches with a pulse width modulation signal. When the load current is lower than the threshold, the pulse width modulation signal is blocked not to switch the low side switch, the switching regulator switches only the high side switch with the pulse width modulation signal, the low side switch remains off, and a diode serially connected to the high side switch acts as a rectifier.02-04-2010
20100026255POWER SWITCH CIRCUIT - A power switch circuit includes a connector connected to a power supply, a detecting circuit, a first switch circuit, and a first conversion circuit. The connector is connected to the detecting circuit and connected to a first power terminal of a motherboard. The connector is connected to a second power terminal of the motherboard via the first conversion circuit and the first switch circuit, the detecting circuit outputs a corresponding control signal according to a type of the power supply to turn the first switch circuit and the first conversion circuit on or off to supply power for the motherboard.02-04-2010
20100019749SWITCHING POWER SUPPLY DEVICE - A switching power supply device for a ripple control system that can obtain the ripple component with the necessary amplitude without using discrete elements. On capacitor Ci of CR integrator 01-28-2010
20090322293SWITCHING CONVERTER INCLUDING A RECTIFIER ELEMENT WITH NONLINEAR CAPACITANCE - A switching converter including a rectifier element with nonlinear capacitance. One embodiment provides a switching element configured to be driven in the on state and in the off state. A first capacitive element is between the load path terminals of the switching element and has a nonlinear capacitance characteristic curve dependent on a voltage between the load path connections. A rectifier element is coupled between the inductive storage element and the capacitive storage element such that it enables a current flow between the inductive storage element and the capacitive storage element when the switching element is driven in the off state. A second capacitive element is between the load path terminals of the rectifier element and has a nonlinear capacitance characteristic curve dependent on a voltage between the load path connections.12-31-2009
20120146605CONTROL CIRCUIT FOR SWITCHING REGULATOR, SWITCHING REGULATOR AND ELECTRONIC EQUIPMENT USING THE CONTROL CIRCUIT - The invention improves the voltage regulation rate of the switching regulator in lag control. A divided output voltage divided by the first resistor and the second resistor is input to a first polarity input terminal of a comparator. A driver is used for controlling a switching transistor and a synchronous rectified transistor according to an output pulse of the comparator. A feedback circuit is used for outputting a switching signal to the reverse input terminal of the comparator according to the output pulse, wherein the switching signal is used for switching two voltage levels between the input voltage and a ground voltage. The error amplifier is used for amplifying an error between the divided output voltage and a first reference voltage and generating a second reference voltage to output to a second polarity input terminal of the comparator.06-14-2012
20090174382Method and Apparatus to Remove Energy from DC Loads - A DC output power converter or DC switch device that includes methods and apparatus to reverse the current in the connected load, thereby draining the load's energy until the voltage in the load is brought to a (near) zero potential and held there.07-09-2009
20090174381CONTROLLER FOR A POWER SUPPLY - A controller for controlling a load output. In various embodiments, the controller may include a closed loop. In some embodiments, the closed loop may have a least one controllable characteristic. In one embodiment, the controller may be configured to control the at least one controllable characteristic in response to changes in the load.07-09-2009
20090174380FIXED FREQUENCY RIPPLE REGULATOR - A ripple regulator for providing a pulse width modulation (PWM) signal for regulating an output voltage of a power converter switching stage. The regulator including a ripple circuit for providing a ripple voltage; a comparison circuit for comparing the ripple voltage to an output of an error amplifier; and a PWM circuit producing the PWM signal and receiving an output of the comparison circuit and a clock signal input, the clock signal input determining a first edge of the PWM signal and the output of said comparison circuit determining a second edge of the PWM signal.07-09-2009
20090174379DC-DC CONVERTER - A dual-mode switching voltage regulator has a duty cycle that varies with the input and output voltages so as to dynamically compensate for changes in the operating conditions. The switching voltage regulator uses input and output voltages/currents to optimize the duty cycle of the signals applied to a pair of switches disposed in the regulator. In the PFM mode, a control block senses the time that a first switch used to discharge an inductor is turned off. If the control block senses that the first switch is opened too early, the control block increases the on-time of a second switch used to charge the inductor. If the control block senses that the first switch is opened too late, the control block decreases the on-time of the second switch.07-09-2009
20100315053HYBRID ON-CHIP REGULATOR FOR LIMITED OUTPUT HIGH VOLTAGE - A driver circuit includes a pre-driver and an output driver. The pre-driver is coupled to receive an input signal and to generate first and second pre-driver output signals in response to the input signal. The output driver generates a driver output signal and includes first and second switches, a native mode transistor, and a driver output. The first switch has a first control terminal coupled to receive the first pre-driver output signal. The second switch has a second control terminal coupled to receive the second pre-driver output signal. The native mode transistor is coupled in series between the first switch and the second switch and has a third control terminal coupled to receive the voltage reference signal. The driver output is coupled between the native mode transistor and the second switch to output the driver output signal.12-16-2010
20100097042LOW DROPOUT REGULATOR HAVING A CURRENT-LIMITING MECHANISM - A low dropout regulator having a current-limiting mechanism is disclosed. The regulator includes a sensing resistor, an error amplifier, and first through fourth transistors. The first transistor generates an output voltage according to an input voltage and a current control signal. The sensing resistor is employed to generate a sense voltage based on the current flowing through the fourth transistor so as to control the second transistor for generating an internal voltage. The third transistor controls the current control signal based on a voltage divided from the internal voltage. The channel width/length ratio of the first transistor is greater than that of the fourth transistor. When the third transistor is turned off, the error amplifier adjusts the voltage of the current control signal according to a voltage divided from the output voltage; when the third transistor is turned on, the voltage of the current control signal is not adjusted.04-22-2010
20080211471Adaptive leading-edge blanking circuit and method for switching mode power converter - In an adaptive leading-edge blanking circuit and method for a switching mode power converter, an inductor current of the converter is sensed and compared with a threshold to decide an end point of a leading-edge blanking time. Circuit and method are further provided for preventing the converter from entering pulse skipping mode, which employs a current trimming circuit in an oscillator for a PWM controller in the converter to reduce a charging current in the oscillator if the output voltage of the converter is excessively high, to thereby reduce the oscillator frequency and in turn lower the switching frequency of a high-side power switch of the converter.09-04-2008
20100026257Non-synchronous boost converter including low-voltage device for load disconnection - A non-synchronous boost converter includes a low-voltage device connected between the input voltage terminal and the output voltage terminal of the converter. When the converter is shutdown, the low-voltage device disconnects the output voltage terminal and the input voltage terminal. Since it is a low-voltage device used in the converter for load disconnection, the efficiency of the converter is improved with lower cost.02-04-2010
20100033146CURRENT SENSING FOR HIGH VOLTAGE BUCK CONVERTER - Methods, systems, and devices are described for providing output (e.g., current) sensing and feedback in high-voltage switching power converter topologies. Certain aspects of high voltage switching converter topologies may make output (e.g., current) sensing difficult. In some embodiments, a sampling module implements sample-and-hold techniques in a low-side switch converter topology to provide reliable current sensing. Embodiments of the sampling module provide certain functionality, including integration, blanking, buffering, and adjustable sampling frequency. Further, some embodiments include feedback functionality for generating a converter driver signal (for driving the switching converter) and/or a sample driver signal (for driving the sampling module) as a function of sensed output feedback from the sampling module.02-11-2010
20090184700ELECTRONIC CONTROL SYSTEM AND POWER SUPPLY UNIT OF THE SYSTEM - A power supply unit for supplying electric current of a supply voltage to a control unit in an electronic control system has switching regulator dropping an input voltage to an intermediate voltage, a first series regulator producing electric current of the supply voltage from the intermediate voltage, and a second series regulator producing electric current of the supply voltage lower than electric current produced in the first series regulator During the standby mode of the control unit, an FET of the switching regulator is locked to the on state to accumulate electric charge in a capacitor of a smoothing circuit, while an output transistor of the first series regulator is locked to the off state. When a wake-up condition is satisfied in the control unit, the FET starts the switching operation, and the output transistor immediately starts the driving operation while using the charge supplied from the capacitor.07-23-2009
20090206809Interleaved Switching Converter, and Switching Controller and Controlling Method Thereof - In an interleaved switching converter, a first converter including a first switch is coupled to a second converter including a second switch. A switching controller for controlling the first switch and the second switch outputs a second control signal for operating the second switch based a first control signal for operating the first switch. A phase shift between the first control signal and the second control signal is 180 degrees.08-20-2009
20090256538POWER SUPPLY MODULE - A power supply module includes an inductor circuit, a switch circuit, a sensor circuit, and a controller. The inductor circuit includes an inductor and a voltage feedback wire returning the terminal voltage of the inductor. The switch circuit is electrically connected to the inductor circuit for driving the inductor circuit. The sensor circuit is electrically connected to the switch circuit and the voltage feedback wire, in which the sensor circuit controls the switch circuit and generates a current feedback signal according to the terminal voltage of the inductor. The controller is electrically connected to the sensor circuit, in which the controller controls the sensor circuit according to the current feedback signal.10-15-2009
20100270993Energy Output Circuit and Its Control Method - An energy output circuit and its control method. The energy output circuit includes a switch device (10-28-2010
20100244794OUTPUT VOLTAGE ADAPTIVE VOLTAGE CONVERTING APPARATUS AND METHOD THEREOF - The present invention is related to, in general, an output voltage adaptive converting apparatus and method thereof. The invention provides an output voltage adaptive voltage converting apparatus, comprising a clock generating unit that generates predetermined clock signals; a switching amplifying unit that amplifies an input voltage (V09-30-2010
20110025282DRIVING CIRCUIT FOR AN ELECTRIC LOAD AND ELECTRIC SYSTEM COMPRISING THE CIRCUIT - An electronic circuit includes a node coupled to a load to be driven, and a power device, which can be switched between activation and deactivation and coupled to the node. The circuit further includes a current generator having an output connected to the node and that can be enabled to generate current at least when the power device is deactivated. The circuit also includes a comparator for comparing an electric voltage of the node with a reference voltage and is configured to generate a comparison signal based thereon.02-03-2011
20110115454VOLTAGE REGULATOR - A voltage regulator is provided that includes current sense circuitry configured to detect an amount of current provided to a load, a voltage controlled oscillator configured to output a clock signal with a constant duty cycle at a frequency that varies in dependence on the amount of current detected by current sense circuitry, and regulator circuitry configured to provide a regulated voltage to the load using the clock signal.05-19-2011
20100066331Overshoot/undershoot elimination for a PWM converter which requires voltage slewing - A level-switching device is coupled to an output node of a PWM converter to switch the output voltage of the PWM converter between two levels by switching a MOS. An undershoot/overshoot eliminator is coupled to the MOS for the MOS changing from totally on state to totally off state or vice versa softly when switching the MOS. The feedback signal transition in the level-switching device becomes slower when switching the MOS to eliminate overshoot/undershoot on the output voltage.03-18-2010
20110133711SEMICONDUCTOR DEVICE AND SWITCHING REGULATOR USING THE DEVICE - The semiconductor device according to the present invention has an n-channel output transistor wherein an input voltage is impressed on a drain, and a pulsed switching voltage that corresponds to a switching drive of the transistor is brought out from a source; a bootstrap circuit for generating a boost voltage enhanced by a predetermined electric potential above the switching voltage; an internal circuit for receiving a supply of the boost voltage to generate a switching drive signal, and supplying the signal to a gate of the output transistor; an overvoltage protection circuit for monitoring an electric potential difference between the switching voltage and the boost voltage, and generating an overvoltage detection signal; and a switching element for establishing/blocking electrical conduction between the internal circuit and the end impressed with the boost voltage, in accordance with the overvoltage detection signal.06-09-2011
20110304306CURRENT MODE CONTROL OF VOLTAGE REGULATORS TO MITIGATE OUTPUT VOLTAGE RIPPLE - Methods and systems may provide for the use of a current control feedback loop to reduce ripple in the output voltage of a regulator such as a switched capacitor voltage regulator. The feedback loop could include an error amplifier that conducts a comparison between a reference voltage and an output voltage from the voltage regulator, and adjusts an instantaneous voltage of a switch of the regulator to generate a matching condition between the regulator current and the current drawn by a load coupled to the regulator.12-15-2011
20120146603VOLTAGE REGULATOR - Provided is a voltage regulator including a phase compensation circuit capable of obtaining an accurate output voltage. The phase compensation circuit includes: a first constant current circuit connected to a gate of an output transistor; a first transistor having a drain connected to the gate of the output transistor; and a second transistor having a drain connected to a gate of the first transistor, a second constant current circuit, and a resistor and having a gate connected to the resistor and any one terminal of a first capacitor, the first capacitor having the other terminal connected to an output terminal of the voltage regulator. This configuration prevents a current from flowing from an output terminal of the differential amplifier circuit to the drain of the first transistor, to thereby reduce an offset voltage to be generated in input transistors of the differential amplifier circuit, thus obtaining an accurate output voltage.06-14-2012
20110101943CURRENT DETECTOR - A current detector is comprised of a switch portion having an input node, an output node and a detection node, the switch portion being configured to selectively shift a power current between the input node and the output node and a detection current between the input node and the detection node; a current controller configured to control the detection current so as to equalize voltages at the detection node and the output node, the current controller being coupled with the detection node and the output node and including a transistor and a diode coupled to the transistor in series so as to prevent impression of negative voltage on the transistor, the transistor and the diode being formed within a single monolithic substrate; and a monitor current output portion having a monitor node and being coupled with the current controller, the monitor current output portion being configured to mirror the detection current in the current controller to the monitor node.05-05-2011
20110304307VOLTAGE ADJUSTMENT MODULE AND POWER SUPPLY DEVICE - A voltage regulation module coupled to a power conversion module to form a closed loop. The power conversion module includes a PWM circuit and a conversion circuit. The conversion circuit includes serially coupled first and second power switches. The PWM circuit outputs a drive signal to control the first and second power switches to cause the conversion circuit to generate an output current. The voltage regulation module includes subtraction and regulation circuits. The subtraction circuit obtains a voltage related to the output current, and performs a subtraction operation on this voltage and a reference voltage to generate a second regulation voltage. The regulation circuit generates a level voltage, which is directly proportional to the output current, according to the second regulation voltage. The PWM circuit adjusts a voltage level of the drive signal according to the level voltage so that this voltage level follows the output current.12-15-2011
20120306465POWER SUPPLY DEVICE, CONTROL CIRCUIT, ELECTRONIC DEVICE AND CONTROL METHOD FOR POWER SUPPLY - A power supply device that includes a switch circuit to which an input voltage is supplied, a coil coupled between the switch circuit and an output terminal from which an output voltage is outputted. A voltage adding circuit adds a slope voltage to a reference voltage. A control unit compares a feedback voltage corresponding to the output voltage and the reference voltage and switches the switch circuit at a timing corresponding to a comparison result of the feedback voltage and the reference voltage. A slope adjustment circuit differentiates a current flowing in the coil and adjusts a slope amount of the slope based on a differentiation result of the current.12-06-2012
20120306464Circuit Arrangement with an Adjustable Transistor Component - Disclosed is a circuit arrangement, including a transistor component with a gate terminal, a control terminal, and a load path between a source and a drain terminal, and a drive circuit connected to the control terminal and configured to determine a load condition of the transistor component, to provide a drive potential to the control terminal, and to adjust the drive potential dependent on the load condition.12-06-2012
20120306466STEP-UP DC-DC CONVERTER - A step-up DC-DC converter has a switching element for feeding current to an inductor; a rectifier connected to the output side of the inductor; and a control circuit performing on/off control of the switching element, based on an output voltage and a voltage corresponded to the inductor current. The control circuit further has a first voltage comparator circuit detecting fall of the output voltage down to the first reference voltage; a second voltage comparator circuit detecting that the inductor current reached a predetermined current value; and a voltage generation circuit generating a voltage inversely proportional to an input voltage and feeds the voltage, as a second reference voltage, to the second voltage comparator circuit. The switching element turns on, when the output voltage fell down to the first reference voltage, whereas the switching element turns off, when voltage proportional to the inductor current rose up to the second reference voltage.12-06-2012
20100277144CONTROL CIRCUIT WITH FREQUENCY COMPENSATION - The present invention discloses a control circuit with frequency compensation, which can be applied to an open-loop control system. The control circuit includes an oscillator which is additionally connected to a first comparator including a first input end, a second input end and a first output end. The first input end provides for inputting a sampling current, the second input end provides for inputting a total voltage of a reference voltage and a DC-level voltage, and the first output end outputs a down-conversion signal. When the sampling current is larger than the total voltage, the first comparator will generate the down-conversion signal to the oscillator to reduce a frequency of the oscillator, such that a current of the open-loop control system can be controlled effectively to prevent an electronic element form being burned down.11-04-2010
20120038335PULSE MODULATION CIRCUIT AND METHOD - A pulse modulation method for adjusting pulse signals according to a working voltage of a load, the method includes the following steps. The working voltage of the load is detected by a feedback terminal of a PWM controller. Whether the load is a light load or a heavy load is determined, if the load is a light load, a pulse skipping mode is entered; the voltage output to the load is detected by the feedback terminal. Whether the voltage output to the load is normal is determined, if the voltage output to the load is low, the pulse skipping mode is stayed for a number of clock cycles; the voltage output to the load is detected to determine whether the voltage is normal. If the voltage output to the load is still low, the pulse skipping mode is jumped out and a normal working mode is entered.02-16-2012
20110109286Power switching circuit - This invention relates to a power switching circuit, and, the switching circuit has very wide bandwidth, better capability to deal with bigger power and better capability to increase chances to impedance-match with loading. The invention has also revealed a backward current decoupler which can be used to drive a loading so that a better capability to impedance-match with loading can be achieved.05-12-2011
20120038338OUTPUT CURRENT DETECTION OF A VOLTAGE REGULATOR - For output current detection of a voltage regulator, the currents in a high-side transistor and a low-side transistor of the voltage regulator are sensed and summarized to a summed current to flow through a setting resistor. The voltage variation on the setting resistor is monitored to provide a feedback signal for feedback control in the voltage regulator. This detection scheme removes the current sensing resistor from the charging current path of the voltage regulator to prevent efficiency loss on it, and is much less sensitive to noise interference because greater voltage variation is available by using a greater setting resistor.02-16-2012
20120038334VOLTAGE REGULATOR HAVING AN OUTPUT VOLTAGE AUTOMATICALLY ADJUSTED ACCORDING TO A LOAD CURRENT - A voltage regulator includes an adjuster to provide an adjust signal according to its load current to adjust at least one of the feedback signal, the reference signal, the error signal, and the ripple signal of the voltage regulator, to automatically adjust the output voltage. The output voltage increases when the load current increases, and decreases when the load current decreases. Preferably, a CCR voltage regulator according to the present invention will have its PWM frequency varying with its output voltage and thus have better transient performance.02-16-2012
20120038333Coil-less stepdown power transformer - This invented device uses mainly two circuits; namely, electronic switch and arithmetic average circuit to average the switched on/off source voltage, AC or DC, down to the load-needed lower value. This device is not of a high frequency coil transformer circuit, yet not of a resistive or reactive voltage drop or dividing circuit. The stepdown ratio of this device is soft-adjustable, and hence the voltage stabilization can be easily implemented inside itself. Inherently, the switching device is light, small, and high power efficiency. Theoretically, the high efficiency of this device is because this device has no no-load loss and a load loss=(constant saturation voltage)×(load current) if BJT or IGBT switch used, while the coil transformer has a no-load loss (iron loss) and a load loss (copper loss). This device can replace most coil transformers to economize the use of energy, copper and iron.02-16-2012
20120146602CONTROL CIRCUIT AND METHOD FOR A BUCK-BOOST SWITCHING CONVERTER - A control circuit and method for a buck-boost switching converter provides a mode determinative circuit to judge the timing of an operation under buck-boost mode based on the input voltage, the output voltage and the mode reference voltage; meanwhile, the control signal generating circuit is provided to turn off the second switch during the first switch being on, turn on the second switch during the first switch being off, turn off the fourth switch during the third switch being on, turn on the fourth switch during the third switch being off, wherein the duty cycles of the first and third switches are identical, and duty cycles of the second and fourth switches are identical.06-14-2012
20120038336DIGITAL PWM CONTROL MODULE - A digital pulse width modulation (PWM) control module for controlling one or more loads includes a transistor operatively connected to and configured to drive one of the loads and a microcontroller programmed to turn the transistor on and off in accordance with a pulse width modulated signal, the pulse width modulated signal comprising a start up delay, a pull in time, and a duty percentage associated with a hold cycle. The control module allows for limiting total current draw by creating a latching type circuit. In addition, a diode bridge may be used to provide polarity protection. Groups of control modules may have an associated delay to assist in reducing rush-in current.02-16-2012
20090085540Voltage Rising/Falling Type Switching Regulator and Reverse Current Prevention Method - A voltage rising/falling type switching regulator includes an inductor, a voltage-falling switching element, a voltage-falling rectifier element, a voltage-rising switching element, a voltage-rising synchronous rectification switching element, a control circuit part, and a reverse current detecting part. The control circuit part is arranged so that the voltage-falling switching element is switched ON and set in a conduction state at the time of voltage-rising operation, and the voltage-rising synchronous rectification switching element is switched ON and set in a conduction state at the time of voltage-falling operation. If the reverse current detecting part detects a reverse current, the voltage-falling switching element is switched OFF and set in a cut-off state.04-02-2009
20120038339System and Method for Powering an Information Handling System in Multiple Power States - Power is supplied to an information handling system chipset with a single voltage regulator having dual phases. A first phase of the voltage regulator provides power to a low power state power rail in an independent mode to support a low power state, such as a suspend or hibernate state. A second phase of the voltage regulator provides power to a run power state power rail in combination with the first phase by activation of a switch, such as a MOSFET load switch, that connects the low power state power rail and the run power state power rail. Voltage sensed from both power rails is applied to control voltage output so that the run power state power rail is maintained within more precise constraints than the low power state power rail.02-16-2012
20080278128CONTROL CIRCUIT FOR STEP-DOWN DC-DC CONVERTER, STEP-DOWN DC-DC CONVERTER AND CONTROL METHOD THEREOF - To provide a control circuit of a step-down DC-DC converter, a step-down DC-DC converter and a control method thereof which can prevent overshoot and production of a through current flowing to a main switching transistor and a synchronous rectifier transistor by adopting a simple circuit configuration. The control circuit of the step-down DC-DC converter in which a main switching transistor M11-13-2008
20090085543Variable Output Voltage Power Converter - A method of generating at least a first voltage and a second voltage in a power converter including at least one DC-DC converter is disclosed. The method includes operating the DC-DC converter as a full-bridge converter to generate the first voltage and operating the DC-DC converter as a half-bridge converter to generate the second voltage. Power supplies including a DC-DC converter selectively configurable as a full bridge converter to provide a first DC voltage and as a half bridge converter to produce a second DC voltage and controller circuits for such configuration are also disclosed.04-02-2009
20110068762CURRENT SENSING CIRCUIT AND SWITCHING REGULATOR INCLUDING THE SAME - A current sensing circuit configured to sense current flowing through a switching transistor of a non-insulated switching regulator, the current sensing circuit includes a voltage divider circuit portion; a first transistor; a first impedance element; a second transistor; a third transistor; and a first voltage comparing circuit portion, wherein control terminals of the first transistor, the second transistor, and the third transistor are connected to each other and a connecting portion of the control terminals is connected to a connecting portion between the third transistor and the first constant current source.03-24-2011
20110068761AVERAGE CURRENT REGULATOR AND DRIVER CIRCUIT THEREOF AND METHOD FOR REGULATING AVERAGE CURRENT - The present invention discloses an average current regulator, a driver circuit of an average current regulator, and a method for regulating an average current. The average current regulator includes: a power stage including at least one power transistor which switches according to a pulse width modulation (PWM) signal to convert an input voltage to an output current; a feedback circuit coupled to the power stage, for generating a feedback signal; an ON-time controller coupled to the feedback circuit, for receiving the feedback signal and generating an ON-time signal according to the feedback signal and an average reference signal relating to a target average current; and a PWM controller, for generating the PWM signal according to the ON-time signal to regulate the average of the output current to the target average current.03-24-2011
20110068760POWER SUPPLY CIRCUIT - A power supply circuit arranged in a circuit board to supply a determined voltage to an element is disclosed. The power supply circuit includes two voltage receiving terminals to receive voltage signals, a window comparator, and an electrical switch. The comparator drives the electrical switch to be turned on, therefore a terminal of the electrical switch stably output the determined voltage to the element.03-24-2011
20110068759Switching Regulator for Fixing Frequency - A switching regulator for fixing a frequency which includes a power stage circuit, for receiving an input voltage and outputting an output voltage according to an control signal; a reference voltage generator for generating a reference voltage; a comparator for outputting a comparing result according to the output voltage and the reference voltage; a constant-time trigger circuit for outputting the control signal according to the comparing result and a compensating signal; an a frequency compensator for outputting the compensating signal according to the output voltage and a phase signal; wherein the phase signal is corresponding to the magnitude of the voltage across the lower gate switch of the power stage circuit.03-24-2011
20100097043INDUCTOR DRIVING CIRCUIT - In an inductor driving circuit, a DC voltage is applied between a positive terminal and a negative terminal. A series connection of an inductor and a transistor is provided between the positive terminal and the negative terminal. A gate control circuit is configured to turn on the transistor in response to the application of the DC voltage and turn off the transistor in response to the stop of the application of the DC voltage. A diode is connected between a source and a drain of the transistor to have a cathode connected to the positive terminal and an anode connected to the negative terminal. A feedback diode has a cathode connected to the positive terminal and an anode connected to the negative terminal.04-22-2010
20110050191INDUCTOR AND DC-DC CONVERTER - An inductor includes a coil electrode section in which a first spiral electrode and a second spiral electrode are wound in substantially the same direction, lie in substantially the same plane, and are connected to each other by a connection electrode. The coil electrode section is sandwiched by the first magnetic layer and the second magnetic layer from both directions substantially perpendicular to the plane. A first protrusion electrode and a second protrusion electrode at ends of the first spiral electrode and the second spiral electrode that are opposite to the connection electrode extend in a direction substantially perpendicular to the plane, have a length at which each of the protrusion electrodes protrudes from the first magnetic layer, and define opposite end electrodes of the inductor. Arranging this low-profile inductor on a mounting circuit board achieves a low-profile DC-DC converter including a two-layer structure.03-03-2011
20110050190Systems and Methods for Enhanced Efficiency Auxiliary Power Supply Module - Provided is a power supply for use in a solar electric production system, including: a first stage having an input connected to a voltage from a photovoltaic panel and an output providing a first voltage different from the voltage from the photovoltaic panel; and a second stage connected to the output of the first stage, the second stage supplying power at a second voltage to a micro-controller, where the output of the first stage is turned on and stable for a period of time before the second stage is turned on to supply the power at the second voltage to the micro-controller.03-03-2011
20110050189BOOSTER AND VOLTAGE DETECTION METHOD THEREOF - A booster and a voltage detection method thereof are provided herein. The booster includes a charge pump circuit and a voltage detection circuit. The charge pump circuit is controlled by a switching signal to generate an actual voltage according to the basis voltage, wherein the actual voltage is a product of the basis voltage multiplied by a first preset multiplier. The voltage detection circuit is coupled to the charge pump circuit. The voltage detection circuit selects one of a plurality of first multipliers to serve as the first preset multiplier according to a comparison result between the basis voltage and a target voltage, and generates the switching signal corresponding to the first preset multiplier. Therefore, the booster can properly select the first preset multiplier to generate the actual voltage as the basis voltage changes.03-03-2011
20110050188POWER SUPPLY CONTROLLER WITH AN INPUT VOLTAGE COMPENSATION CIRCUIT - An example controller for a power supply includes a drive signal generator and a compensation circuit. The drive signal generator is to be coupled to control switching of a switch included in the power supply to regulate an output voltage of the power supply in response to a sensed output voltage such that the output voltage of the power supply is greater than an input voltage of the power supply. The compensation circuit is coupled to the drive signal generator and is also coupled to output an offset current to adjust the sensed output voltage in response to the input voltage of the power supply.03-03-2011
20110050187Driving Control Device and Method for Power Converting System - A driving control device and method for power converting system includes power converting circuit and driving control device. The driving control device has an analog/digital convertor, a measuring device, and a control module. The driving control method is the analog/digital convertor receives a inductor current and the parameters of the inductor current from the measuring device, measures the slope parameter of the inductor current according the parameters from Equation 1 and Equation 2, then calculates a duty cycle parameter from the slope parameter of the inductor current and use the duty cycle parameter to generate pulse control signal to perform driving control.03-03-2011
20110316506Dual Loop Voltage Regulator with Bias Voltage Capacitor - A voltage regulator includes a regulator input connected to a reference voltage; a regulator output that outputs a regulated voltage to an electrical load; a first loop, the first loop configured to receive the reference voltage, the first loop outputting a bias voltage; a second loop, the second loop configured to receive the bias voltage as an input; and a bias voltage capacitor connected to a node between the first loop and the second loop.12-29-2011
20110316505Output Buffer With Improved Output Signal Quality - An output buffer receives an input signal and generates an output signal at an output node. The output buffer contains a driver circuit. The driver circuit includes two pairs of cascoded transistors connected at a junction node. Each of the cascoded pairs receives a corresponding level-shifted signal representing the input signal, and generates corresponding driver signals on driver nodes which are coupled to the output node. The driver circuit includes a capacitor connected between one of the driver nodes and the junction node. The capacitor enables the corresponding driver signal to be generated to reach a desired voltage quickly. The output impedance of the output buffer with which the output signal is launched is reduced and more closely matched the impedance of the path on which the output signal is provided. Signal quality of the output signal is thereby improved.12-29-2011
20110316509Start-up circuit and method thereof - Methods and circuits related to power regulator start-up are disclosed. In one embodiment, a start-up circuit can include: (i) a delay circuit having a resistor and a capacitor, where the capacitor is coupled between ground and a common node; and (ii) a control chip that receives a reference voltage, and includes an input pin coupled to an input source, an output pin supplying power for a device, and a multiplexed pin coupled to the resistor at the common node to receive an enable signal. The start-up circuit outputs an electrical signal at the output pin based on a comparison of a voltage at the multiplexed pin against the reference voltage, and after a delay time determined by the capacitor and the reference voltage. The voltage at the multiplexed pin can increase continuously with a rising slope determined by input current flowing through the multiplexed pin during a start-up process.12-29-2011
20110316508Digital Hybrid V2 Control for Buck Converters - Stabilization of a switching voltage regulator employing V12-29-2011
20110316507Multiple-input comparator and power converter - Techniques pertaining to multiple-input comparator and power converter designs are disclosed. According to one aspect, the present invention discloses a multiple-input comparator comprising a pair of differential transistors connected by a resister. The gate terminals of the transistor pair serve as the input terminals of the comparator for receiving external voltage for comparison. The terminal of the resistor serves as the current input terminal and is either connected to a current source or a current sink. A power inverter utilizing the multiple-input comparator is also disclosed. The power inverter comprises a power switch driven by a PMW signal, a voltage sampling circuit, an error amplifier and a multiple-input PWM comparator.12-29-2011
20090027021DEAD-TIME TRANSITION ADJUSTMENTS FOR SYNCHRONOUS POWER CONVERTERS - A method of operating a synchronous power converter detects when at least one of an upper power switch and a lower power switch of the converter transition to an off state during a dead-time transition interval between the upper power switch and the lower power switch. The method generates a first comparison signal, indicative of a voltage level at a phase node of the converter, in a dead-time adjustment circuit coupled to the converter. The method further detects a body diode conduction level of at least one of the upper and lower power switches in the off state using at least a second comparison signal generated in the dead-time adjustment circuit and adjusts the dead-time transition interval between the upper power switch and the lower power switch using at least one current source from the dead-time adjustment circuit to reduce the dead-time transition interval to a desired dead-time interval.01-29-2009
20090315529SAWTOOTH WAVE GENERATING CIRCUIT AND SWITCH MODE POWER SUPPLY DEVICE HAVING THE SAME - A sawtooth wave generating circuit that outputs a sawtooth wave signal after calibration and a switch mode power supply device including the sawtooth wave generating circuit is disclosed. The sawtooth wave generating circuit includes a capacitor, a calibration circuit, a charging circuit, discharging circuit and a control unit. The calibration circuit feedbacks a sawtooth wave signal, generates a plurality of voltage signals based on the sawtooth wave signal, and selects one of the voltage signals to generate a calibration output signal. Therefore, the sawtooth wave generating circuit generates a stable sawtooth wave signal regardless of operating conditions.12-24-2009
20110101939DRIVING CONTROLLER, POWER CONVERSION CIRCUIT, AND METHOD FOR MODULATING DRIVING VOLTAGE LEVEL WITH RESPECT TO LOADS - A driving controller, power conversion circuit, and method for modulating driving voltage level with respect to a load are disclosed. In which the method, controller and circuit are applied for modulating the driving voltage of a transistor in a power converter. The driving controller includes a load parameter measurement unit, a voltage modulation unit, and a driving control unit. In which the load parameter measurement unit detects a load parameter which represents the magnitude of the load of the power conversion circuit. The voltage modulation unit then modulates the potential level of the driving voltage of the transistors in response to the load parameter for reducing unnecessary power consumption associated with the transistors in the power converter and enhancing overall power efficiency of the power conversion circuit.05-05-2011
20120043952SEMICONDUCTOR INTEGRATED CIRCUIT, SWITCHING POWER SUPPLY, AND CONTROL SYSTEM - A semiconductor integrated circuit includes a current mirror having a predetermined input-output ratio and including a first transistor configured to receive an input current and a second transistor configured to output an output current, and an output transistor configured to generate a reference voltage according to the output current of the current mirror. The value of the output current is greater than the value of the input current, and the total area of one or more collector regions of the first transistor is substantially the same as the total area of one or more collector regions of the second transistor.02-23-2012
20120043951Switching Regulator and Constant On-time Module - The prevent invention provides a switching regulator with a constant on-time structure. The switching regulator includes power stage circuit, for outputting an output voltage to a load according to a control signal, and a constant on-time module, coupled with the power stage circuit, for adjusting off-time of the control signal according to a resistance of the load.02-23-2012
20120043950SYSTEM AND METHOD FOR CONTROLLING A POWER SWITCH IN A POWER SUPPLY SYSTEM - One embodiment of the invention includes a power supply system. The system includes at least one power switch configured to be activated and deactivated based on a duty-cycle of a respective at least one control signal to generate an output voltage. The system also includes a gate driver configured to generate the at least one control signal and to adjust a slew-rate of each pulse of the at least one control signal to substantially mitigate amplitude ringing at a switching node during a first rising-edge portion and to substantially mitigate conduction losses associated with the at least one power switch during activation and deactivation of the at least one power switch during a second rising-edge portion.02-23-2012
20120062199III-Nitride Power Converter Circuit - An integrated circuit that includes a power stage and a driver stage, all stages using III-nitride power devices.03-15-2012
20120062196CONVERTING CONTROLLER - The present invention employs a pin of a controller to set an over current protection value and a time period respectively by means of time-division and/or voltage and current. Therefore, the cost of the controller is reduced due to reducing the amount of pins thereof. Furthermore, the time period is not only used to setting a constant on time, but also used to setting a constant off time and an operating frequency for different controlling mode.03-15-2012
20110156677LOW-DROPOUT REGULATOR - There is provided a low-dropout regulator capable of preventing transistors from operating in a triode or deep triode region. A low-dropout regulator according to an aspect of the invention may include: a first operational amplifier having a first input receiving an input voltage; a first P-channel MOSFET having a gate connected to an output of the first operational amplifier, a source connected to a power source terminal, and a drain connected to an output terminal; a feedback circuit providing at least portion of a voltage of the output terminal as a feedback to a second input of the first operational amplifier; and a triode limiter circuit receiving voltages at the source and the gate of the first P-channel MOSFET comparing a voltage difference therebetween with a predetermined reference voltage, and increasing a voltage of the second input of the first operational amplifier when the voltage difference is substantially the same as the reference voltage to thereby prevent the first P-channel MOSFET from entering a triode mode or a deep triode mode.06-30-2011
20110156679INTEGRATED TRENCH GUARDED SCHOTTKY DIODE COMPATIBLE WITH POWERDIE, STRUCTURE AND METHOD - A method and structure for a voltage converter including a trench field effect transistor (FET) and a trench guarded Schottky diode which is integrated with the trench FET. In an embodiment, a voltage converter can include a lateral FET, a trench FET, and a trench guarded Schottky diode integrated with the trench FET. A method to form a voltage converter can include the formation of a trench FET gate, a trench guarded Schottky diode gate, and a lateral FET gate using a single conductive layer such as a polysilicon layer.06-30-2011
20110156680Methods and related controllers for controlling output power of a power supply - A method of controlling a power supply comprising a switch and an inductive device includes turning the switch on to energize the inductive device, detecting inductor current flowing through the inductive device to generate a current sensing signal, comparing a peak of the current sensing signal and a limiting signal to generate an adjustment value, and comparing the current sensing signal and the limiting signal. The switch is closed when the current sensing signal, the limiting signal, and the adjustment value are approximately in a specific relationship for approximately equalizing a next peak of the current sensing signal to the limiting signal to cancel signal delay influence.06-30-2011
20110156675POWER CONVERTER HAVING A SWITCH COUPLED BETWEEN WINDINGS - An example power converter includes a first winding, a second winding, a switch, a controller and an output circuit. The second winding is magnetically coupled to the first winding and the controller includes a feedback terminal and a common terminal. The controller is coupled to control the switch to regulate an output of the power converter in response to a feedback voltage received at the feedback terminal. The output circuit is coupled between the common terminal of the controller and a common reference of the power converter to provide an output voltage to a load. The feedback voltage is a positive voltage with respect to the common terminal and the output voltage is a negative voltage with respect to the common reference of the power converter.06-30-2011
20110156678SEMICONDUCTOR DEVICE AND DC-TO-DC CONVERTER - In general, according to one embodiment, a semiconductor device includes a device main body, a semiconductor substrate. The device main body includes a semiconductor substrate mounting part and a first conductor provided around the semiconductor substrate mounting part. The semiconductor substrate includes a DC-to-DC converter control circuit having a detector to detect at least one of a current flowing through the first conductor and a voltage supplied to the first conductor. The semiconductor substrate is disposed on the semiconductor substrate mounting part so that the detector comes close to the first conductor.06-30-2011
20110156676GENERATING A REGULATED SIGNAL FROM ANOTHER REGULATED SIGNAL - An embodiment of a method includes generating a regulated output signal from a regulated intermediate signal in response to a reference signal and the regulated output signal, and generating the regulated intermediate signal from an input signal in response to the regulated output signal and the regulated intermediate signal. By generating one regulated signal (e.g., a regulated output voltage) from another regulated signal (e.g., a regulated intermediate voltage), one may significantly reduce the magnitude of the ripple component of the one regulated signal as compared to a conventional regulation technique. Furthermore, by generating the regulated intermediate signal in response to the regulated output signal, one may significantly increase the efficiency of the regulation as compared to conventional signal regulation.06-30-2011
20110156674LOW DROPOUT REGULATOR - A low dropout regulator having a power transistor, a current-voltage converting circuit, a current variation sensing circuit and a compensation circuit is provided. The power transistor has a power terminal receiving an input voltage, a control terminal, and an output terminal coupled to the current-voltage converting circuit to generate an output voltage. The current variation sensing circuit provides a first and a second output terminal and, according to a current variation of the power transistor, the first and second output terminals vary with distinct voltage transition speeds. The compensation circuit controls the control terminal of the power transistor to adjust the output voltage according to a first voltage difference between a feedback of the output voltage and a reference voltage and a second voltage difference between the second and first output terminals of the current variation sensing circuit.06-30-2011
20120001606Voltage regulator circuit - A voltage regulator circuit comprises active and standby amplifiers, first and second transistors, and a capacitor. The active amplifier has a negative input connected to a first reference voltage, and the standby amplifier has a negative input connected to a second reference voltage. The first reference voltage is greater than the second reference voltage. The first transistor has a gate connected to an output of the active amplifier and a drain connected to a voltage regulated output, and the second transistor has a gate connected to an output of the standby amplifier and a drain connected to the voltage regulated output. The capacitor is connected between a chip enable signal and the voltage regulated output.01-05-2012
20120001609DC/DC CONVERTER - In a non-isolated DC/DC converter, a reference potential for a low-side pre-driver which drives a gate of a low-side MOSFET is applied from a portion except for a main circuit passing through a high-side MOSFET and the low-side MOSFET so that a parasitic inductance between a source of the low-side MOSFET and the pre-driver is increased without increasing the sum of parasitic inductances in the main circuit and negative potential driving of the gate of the low-side MOSFET can be performed and a self turn-on phenomenon can be prevented without adding any member and changing drive system.01-05-2012
20120001607DROP POWER SUPPLY CIRCUIT - A capacitor drop power supply circuit for supplying power to a load has a switch configured to alter a configuration of the power supply circuit to reduce input current of the power supply circuit. The switch is operable by the load to alter the configuration when the load enters a power save mode. The switch is operable to alter the configuration of the power supply circuit between a first configuration having a first current path through the power supply circuit in a first current direction, and a second configuration having a second current path through the power supply circuit in the first current direction. The switch changes the power supply circuit between the first configuration and the second configuration when the load enters a power save mode.01-05-2012
20100127682METHODS AND SYSTEMS FOR COMPONENT VALUE ESTIMATION IN POWER SUPPLIES/CONVERTERS - In one embodiment, the method of these teachings includes decomposing the output ripple voltage into its constituent components and utilizing the scale factor necessary for this decomposition to obtain the measure capacitance and ESR for a power supply/converter.05-27-2010
20120056606DC-DC CONVERTER AND SEMICONDUCTOR CHIP - A DC-DC converter includes: a first inductor connected between the second end of the first MOS transistor and the output terminal; a second inductor connected between the second end of the third MOS transistor and the output terminal; a first capacitor connected between a gate of the second MOS transistor and the second end of the third MOS transistor; a second capacitor connected between a gate of the fourth MOS transistor and the second end of the first MOS transistor; and a third capacitor connected at a first end thereof to the second end of the first MOS transistor and connected at a second end to the second end of the third MOS transistor. The DC-DC converter includes: a first resistor connected at a first end to the gate of the second MOS transistor; a second resistor connected at a first end thereof to the gate of the fourth MOS transistor; and a first bias adjustment circuit which compares the output voltage with a preset first reference voltage and which applies a first bias voltage to a second end of the first resistor and a second end of the second resistor to make the output voltage equal to the first reference voltage.03-08-2012
20120062197ELECTRONIC DEVICE AND METHOD FOR DISCRETE LOAD ADAPTIVE VOLTAGE REGULATION - The invention relates to an electronic device which comprises a voltage regulator for providing a regulated output voltage to an electronic circuit and a control stage coupled to control the voltage regulator. The control stage is further configured to detect a request for a change of a system configuration of the electronic circuit coupled to receive the output voltage of the voltage regulator, to determine an activity factor of the electronic circuit for the requested system configuration, to determine a system clock frequency of a system clock of the electronic circuit, to determine a required current drive level of the voltage regulator based on the activity factor, the system clock frequency or the product of both, and to adjust the current drive level of the voltage regulator to the requested current drive level.03-15-2012
20120062195ACTIVE WIRE COMPENSATION CIRCUIT AND CONTROLLER WITH THE SAME - An active wire compensation circuit, adapted to compensate a level of an output voltage detecting signal, is disclosed. A feedback controller controls a converting circuit according to the compensated output voltage detecting signal to have a load voltage for driving a load stabilized at a predetermined voltage level. The active wire compensation circuit comprises a compensating unit and a feedback compensating unit. The compensating unit detects the load current flowing through the load and accordingly generates a compensating current. The feedback compensating unit modulates the level of the output voltage detecting signal according to the compensating current and generates the compensated output voltage detecting signal.03-15-2012
20120062194HIGH SIDE CONTROLLER CAPABLE OF SENSING INPUT VOLTAGE AND OUPUT VOLTAGE OF A POWER CONVERSION CIRCUIT - A high side controller capable of sensing input voltage and output voltage of a power conversion circuit, including: a first switch, having a control end and two channel ends, the control end being coupled to a gate signal, and one of the two channel ends being coupled to a voltage signal, wherein the voltage signal is proportional to a negative version of the input voltage when the gate signal is active; an inverting amplification circuit, having an input end coupled to the other one of the two channel ends, and an output end for providing a first processed voltage; and a first sample and hold circuit, having a control input end coupled to the gate signal, an input end coupled to the first processed voltage, and an output end for providing a first sample voltage.03-15-2012
20120007572AUTO CASCODE BUCK VOLTAGE CONVERTER - A voltage converter includes a power switch having respective charging and discharging control terminals, and an output terminal coupled to a series connected inductor and capacitor. The voltage converter also includes a charging switch coupled to the charging control terminal of the power switch, a discharging switch coupled to the discharging control terminal of the power switch, and a feedback circuit coupling the power switch, charging switch and discharging switch to a node at which the capacitor and inductor are connected. During a charging phase, the charging switch couples the capacitor to the charging control terminal of the power switch, and during a discharging phase, the discharging switch couples the capacitor to the discharging control terminal of the power switch.01-12-2012
20110095740SWITCHING REGULATOR - The invention provides a technique to widely spread the frequency spectrum of switching noise generated by a switching action and to reduce the noise level at a particular frequency. A switching regulator (04-28-2011
20110018513VARIABLE VOLTAGE DC-DC CONVERTER - A DC-DC converter configured to vary an output voltage includes an oscillator circuit configured to output a first clock signal; a digital-to-analog converter controlled based on the first clock signal input thereto and configured to output a voltage according to a voltage setting signal; a delay circuit configured to output a second clock signal delayed by a predetermined delay time with respect to the first clock signal input thereto; an error amplifier circuit having the output voltage of the digital-to-analog converter input thereto as a reference voltage; a pulse width modulation comparator provided with an output of the error amplifier circuit and a voltage into which a current flowing through an inductor is converted; and a control part configured to control a switching transistor of the DC-DC converter based on the second clock signal output by the delay circuit and an output of the pulse width modulation comparator.01-27-2011
20100253298LDO With Distributed Output Device - A method and apparatus for supplying independently switched, regulated power to a plurality of loads is disclosed.10-07-2010
20120013319Power control apparatus and method - A power control apparatus for controlling a supply voltage for an associated circuit comprises a power input for receiving an input voltage and a power output for supplying the supply voltage to the circuit. A switch device is provided with a first terminal coupled to the power input, a second terminal coupled to the power output and a control terminal for receiving a sleep select signal. A control device selectively configures the switch device to act as either a power gating switch, in which the switch device is responsive to the sleep select signal to select whether or not to supply the input voltage to the power output; or a retention switch in which a voltage difference is formed between the power input and the power input and the switch device supplies a retention voltage to the power output, the retention voltage being different to the input voltage.01-19-2012
20120013320VOLTAGE REGULATING CIRCUIT AND A METHOD FOR PRODUCING A REGULATED DC OUTPUT VOLTAGE FROM AN UNREGULATED DC INPUT VOLTAGE - A voltage regulator receives an unregulated DC input voltage supply and provides a regulated DC output voltage. A primary pass element and an external resistor are located in a primary current path through which a load current flows from the input terminal to the output terminal. The voltage regulator includes two control circuits that control the impedances of two pass elements. Power dissipation can be improved and the dropout voltage can be reduced by maintaining the voltage on an internal node of the voltage regulator.01-19-2012
20100127677ELECTRIC POWER SUPPLY DEVICE - In an electric supply device of the present invention, since a semiconductor element T05-27-2010
20120206119VOLTAGE REGULATOR - Provided is a voltage regulator having improved overshoot characteristics. In the voltage regulator, a current limiting circuit formed of, for example, a constant current source is provided in series to an output transistor, to thereby limit an output overcurrent. Further, a voltage limiting circuit formed of, for example, a diode is provided to an output terminal, to thereby limit an output voltage.08-16-2012
20120206120POWER REGULATOR - A power regulator for converting an input voltage to an output voltage includes an error amplifier, a start-up circuit, and a pass device. The error amplifier is powered by the output voltage and provides a control current according to a difference between a reference signal and a feedback signal indicative of the output voltage. The start-up circuit is powered by the input voltage and provides a start-up current. The pass device receives the input voltage, provides the output voltage at an output terminal of the power regulator, generates an output current flowing through the output terminal according to the start-up current during a start-up duration of the power regulator, and generates the output current through the output terminal according to the control current during a normal operation of the power regulator.08-16-2012
20120206118Dynamic Frequency and Pulse-Width Modulation of Dual-Mode Switching Power Controllers in Photovoltaic Arrays - A converter unit configured to couple to a photovoltaic panel may include a controller that monitors: an output voltage and output current obtained from the photovoltaic panel by a switching power core within the converter unit, and an output voltage and output current produced by the switching power core. The controller may calculate a desired duty-cycle value based on the monitored values, and implement a mapping algorithm that translates the duty-cycle value to a pulse-width value and a modulus value. The pulse-width value and the modulus value may be used to simultaneously respectively modulate the pulse-width and pulse-period of a pulse-width modulated (PWM) signal, while maintaining an appropriate linear final duty-cycle ratio between the pulse-width and the pulse-period of the PWM signal. The PWM signal may be provided to the switching power core to control the switching of the switching power core.08-16-2012
20120206117MULTI-FUNCTION TERMINAL OF POWER SUPPLY CONTROLLER FOR FEEDBACK SIGNAL INPUT AND OVER-TEMPERATURE PROTECTION - The present invention provides a control circuit having a multi-function terminal. The control circuit comprises a switching circuit, a sample-and-hold circuit, a detection circuit, and a comparator. The sample-and-hold circuit is coupled to the multi-function terminal for generating a sample voltage by sampling the feedback signal during a first period. The detection circuit is coupled to the multi-function terminal during a second period for generating a detection voltage. The comparator compares the detection voltage and the sample voltage for generating an over-temperature signal, wherein the over-temperature signal is couple to disable the switching signal.08-16-2012
20100194362REGULATOR WITH PULSE WIDTH MODULATION CIRCUIT - A pulse width modulation circuit that controls the output voltage of a regulator. The regulator includes a switching element, which is activated and deactivated by a pulse signal, and a PMW control circuit, which provides the switching element with the pulse signal in accordance with a duty ratio determined from a reference voltage and an error voltage. The error voltage is the difference between the output voltage and reference voltage. The PWM control circuit includes a current source that generates a current in accordance with the error voltage, a capacitor arranged between the current source and ground, and a comparator. The comparator has a non-inverting input terminal, which is connected between the current source and capacitor, and an inverting input terminal, to which the reference voltage is applied. An output signal of the comparator is provided to the switching element.08-05-2010
20120153914LOAD CONTROL APPARATUS - A load control apparatus is provided in which a circuit of detecting an overcurrent can be correctly operated even if a first capacitor (C06-21-2012
20100264891Control Method for Voltage Converter and Related Voltage Converter - A control method for a voltage converter includes providing a setting for a power-saving mode; entering the power-saving mode, and according to the setting, making the voltage converter output a preset level of energy; entering a normal mode, determining whether the voltage converter should enter into the power-thrift mode, and detecting an output response of the voltage converter; and adjusting the setting based upon the output response, to make the output response approximately be maintained in a preset range.10-21-2010
20120153912Controller for a Power Converter and Method of Operating the Same - A controller, power converter and method of controlling a power switch therein to improve power conversion efficiency at low output current. In one embodiment, the power converter includes a power switch coupled to a source of electrical power, and a controller coupled to a control terminal of the power switch and to an output of the power converter. The controller is configured to control a conductivity of the power switch at a selected switching frequency from a set of discrete switching frequencies as a function of an output characteristic of the power converter.06-21-2012
20120153913METHOD FOR IMPROVING VOLTAGE IDENTIFICATION TRANSIENT RESPONSE AND VOLTAGE REGULATOR - An exemplary method for improving voltage identification (VID) transient response is adapted to a voltage regulator and includes steps of: continuously sensing an inductor current of the voltage regulator to thereby output a current sense signal; during a steady state operation period, sampling the current sense signal to thereby obtain a sampling result for providing a droop control signal; after entering a VID transient period from the steady state operation period, holding the sampling result for providing the droop control signal; and taking the droop control signal as a consideration factor of producing a pulse width modulation signal to regulate an output voltage of the voltage regulator.06-21-2012
20120153911SYSTEMS AND METHODS FOR SWITCHED MODE POWER AMPLIFICATION - Systems and methods for switched mode power amplification are disclosed herein. A circuit is provided comprising an amplifier network, a DC translation stage for receiving input voltage from the amplifier network and for providing an output voltage to a voltage boost circuit, and a feedback network for providing feedback from the voltage boost circuit to the amplifier network.06-21-2012
20090001955DC-DC Converter - Disclosed is a low noise, non-isolated DC-DC converter for providing a non-inverted (i.e., the same polarity as an input voltage) output voltage of any desired voltage by stepping-up/down the input voltage. It comprises an input coil L01-01-2009
20090174383FREQUENCY COMPENSATION BASED ON DUAL SIGNAL PATHS FOR VOLTAGE-MODE SWITCHING REGULATORS - A frequency compensation method for voltage-mode switching regulators is disclosed. A lowpass filter and a bandpass filter are employed in the two signal paths into the dual inputs of PWM comparators. In one embodiment, two zeros are generated to compensate for the L-C output filter poles. Stable operation, low output voltage ripple and fast load transient response are achieved; while the power consumption of error amplifier and the area for implementing on-chip passive components are greatly reduced.07-09-2009
20090134857APPARATUS AND METHOD FOR ADJUSTING WORKING FREQUENCY OF VOLTAGE REGULATOR DOWN CIRCUIT (VRD) BY DETECTING CURRENT - The present invention provides an apparatus for adjusting a working frequency of a VRD. The apparatus includes a current detecting circuit, a variable resistance module, and a controller. The current detecting circuit is adapted for determining an output load state of the VRD by detecting a value of a current outputting from the VRD, and outputting a control signal for adjusting the working frequency of the VRD according to the output load state of the VRD. The variable resistance module is coupled to the VRD, and is adapted for providing an external resistor to the VRD. The controller is coupled to the current detecting circuit, and is adapted for receiving the control signal, and adjusting a resistance of the variable resistance module, so as to adjust the working frequency of the VRD.05-28-2009
20090134860POWER SUPPLY APPARATUS - In a power supply apparatus that is so configured as to produce from an input voltage an output voltage Vo within a predetermined permissible variation range, the output voltage Vo is so controlled as to decrease within the permissible variation range as the output current lo increases. This configuration offers an output voltage with an improved transient characteristic against an abrupt variation in the output current and simultaneously permits reduction of the power consumed when the output current increases05-28-2009
20090134858VOLTAGE REGULATING APPARATUS AND METHOD AND VOLTAGE REGULATOR THEREOF - A voltage regulating apparatus and method and voltage regulator thereof are presented. The apparatus includes a first regulator and a second regulator. The first regulator is used for receiving an input voltage and outputting a first voltage according to the input voltage. When the input voltage reaches a steady voltage value, the second regulator is turned on so as to receive the first voltage provided by the first regulator and output a second voltage according to the first voltage or the input voltage.05-28-2009
20090134859Switching power supply device - A switching power supply device has lower correction circuit losses, and enables adjustments without affecting overcurrent limiting or other characteristics. An integrated circuit IC for power supply control generates a switching signal based on a feedback signal from a feedback circuit and a voltage signal from a current detection input terminal, and outputs the switching signal from an output terminal to a switching element. A voltage controlled oscillator is provided which, when the load is judged to be light based on the magnitude of the feedback signal, lowers the switching frequency. The correction circuit is connected between the output terminal of the integrated circuit and the signal input terminal for current detection, acts only when the switching element is on, and has the function of further lowering the switching frequency set in the integrated circuit.05-28-2009
20110089919HIGH-SIDE DRIVER - A high-side driver has a semiconductor element being connected in series in a power supply path extending from a DC power source to a linear solenoid and turned on/off to control a current of the linear solenoid. The high-side driver includes a current detector of a current of the linear solenoid, a controller of the semiconductor element, a state detector of the high-side driver or the linear solenoid and output a state signal, a first transmit buffer to latch and output the state signal, a second transmit buffer to output the state signal without latching the same, and a transmit shift register to convert the state signal into serial data and transmit the serial data to an external device at predetermined timing. The state detector selects at least one of the first and second transmit buffers and outputs the state signal to the selected one.04-21-2011
20110089918Switching Voltage Regulator - A switching regulator comprises a sensing module for sensing an input current of the switching regulator to generate a sensing current, a switch module for determining whether an input end is electrically connected to an output end, a first comparator for comparing a feedback signal and a reference voltage to generate a first comparison result, a compensation module for providing a compensation signal, a sawtooth wave generator for generating a sawtooth wave signal according to the sensing current, a second comparator for comparing the sawtooth wave signal and the compensation signal to generate a second comparison result, a third comparator for comparing the sawtooth wave signal and the first comparison result to generate a third comparison result, and a logic module for generating a switching signal according to the second and the third comparison results.04-21-2011
20110089917INDUCTIVE CONVERSION DEVICE AND ENERGY CONTROL METHOD - An energy control method for a inductive conversion device comprising: determination of individual error of multiple output voltages; determination of peak current based on the errors, determination of total energy through the peak current and charging to at least one inductor according to the peak current, whereas the inductor will store the total energy.04-21-2011
20120119718SELF-ADAPTIVE CURRENT-MODE-CONTROL CIRCUIT FOR A SWITCHING REGULATOR - A current-mode-control circuit for a switching regulator is provided. The circuit includes a first transistor coupled to a power supply voltage, a second transistor, and an inductor. The circuit further includes a slope compensation generation circuit coupled to the output of the current control circuit through a feedback loop, the slope compensation generation circuit generating a slope compensation current related to the output voltage, an inductor current sensing circuit coupled to the first transistor and the second transistor, and configured to calculate a current through the inductor and output a inductor sense current, and a pulse-width modulation control circuit coupled to the slope generation circuit and the inductor current sense circuit, the pulse-width modulation control circuit receiving the output of the current control circuit, the slope compensation current and the inductor sense current as inputs.05-17-2012
20120119717Voltage Regulator Module with Power Gating and Bypass - Mechanisms are provided for either power gating or bypassing a voltage regulator. Responsive to receiving an asserted power gate signal to power gate the output voltage of the voltage regulator, at least one of first control circuitry power gates the output voltage of a first circuit or second control circuitry power gates the output voltage of a second circuit such that substantially no voltage to is output by the first circuit to a primary output node. Responsive to receiving an asserted bypass signal to bypass the output voltage of the voltage regulator, at least one of the first control circuitry bypasses the output voltage of the first circuit or the second control circuitry bypasses the output voltage of a second circuit such that substantially the voltage of a voltage source is output by the first circuit to the primary output node.05-17-2012
20120119719POWER SUPPLY CIRCUIT - According to one embodiment, a power supply circuit includes a switching control unit that compares a DA converted value of the high order bit of a digital compensation value calculated from an output voltage of a smoothing circuit with a detection value of a current flowing into the smoothing circuit and controls the switching of a switching element on the basis of a signal obtained by shifting the timing of the comparison result on the basis of the low order bit of the digital compensation value.05-17-2012
20110109285OPERATION OF A THREE LEVEL CONVERTER - A method of operating a three level converter includes controlling the output voltage of the converter when a DC link voltage of the three level converter is lower than one-half of a rated DC link voltage of the converter by, for each leg of the converter, alternately connecting an output terminal of the leg to the positive terminal or the negative terminal of the DC link. When the DC link voltage is at least one-half of the rated DC link voltage, the method includes controlling the output voltage of the converter by, for each leg, selectively connecting the output terminal of the converter to the positive terminal, the negative terminal, or a mid-point of the DC link.05-12-2011
20120249103SYSTEMS AND METHODS FOR INTEGRATED SWITCH-MODE DC-DC CONVERTERS FOR POWER SUPPLIES - A first control system for a power supply includes a switch-mode DC-DC converter module and an FET gate drive module. The switch-mode DC-DC converter module receives an input voltage and generates first and second voltages, the first voltage powering a DC-DC control module. The FET gate drive module selectively drives a plurality of FETs of the power supply using the second voltage thereby generating a desired output voltage from the input voltage. A second control system is directed to driving the second voltage to a desired gate voltage, wherein the desire gate voltage is determined based on at least one of a plurality of operating parameters. A third control system includes controlling first and second voltages generated by a SIDO voltage converter based on the first and second voltages and a damping factor, and generating the damping factor based on current flowing through the inductor of the SIDO voltage converter.10-04-2012
20100289472LOW DROPOUT VOLTAGE REGULATOR WITH LOW QUIESCENT CURRENT - The disclosure relates to a low dropout voltage regulator comprising a regulation transistor to supply an output voltage from an input voltage, a gate control stage to supply a gate voltage to the regulation transistor, and an error amplifier to supply a control voltage to a control terminal of a control transistor. The low dropout voltage regulator also comprises a quiescent current control circuit to limit a quiescent current flowing through the gate control stage when the input voltage approaches the output voltage and causes the regulation transistor to enter into an ohmic conduction mode. The quiescent current control circuit comprises a current source providing a reference current and is configured to control the quiescent current by current-mirror effect based upon the reference current.11-18-2010
20100289471POWER CONTROL DEVICE, POWER SUPPLY DEVICE, AND POWER CONTROL METHOD - A power control device for performing switching control for an output voltage of a power supply device includes a signal generation circuit for comparing a difference between a value of the output voltage and a value of a first reference voltage with a value of a second reference voltage, and for stopping the switching control when a value of the difference is less than or equal to the value of the second reference voltage, and an adjuster circuit for adjusting the second reference voltage based on a ratio between a value of an input voltage and the value of the output voltage.11-18-2010
20100289470Power Supplying Method for LCD Display Device and Power Supply Device - A power supply device of a LCD display device comprising an AC rectifier; a square wave generator; an AC voltage converting module, coupled to the square wave generator, for providing an AC voltage to a backlight module of the LCD display device; and a plurality of DC voltage converting modules, for providing a plurality of voltage sources to a plurality of load circuits of the LCD display device, each DC voltage converting module comprising a control circuit for masking off the first oscillating signal, to generate a second oscillating signal according to a feedback signal of a corresponding load circuit; a voltage converting unit, coupled to the control circuit and the load circuit, for transforming the second oscillating signal into a voltage source for the load circuit; and a feedback control unit, coupled to the control circuit and the load circuit, for generating the feedback signal.11-18-2010
20100289468Voltage Regulator and Method for Voltage Regulation - A voltage regulator (11-18-2010
20100289467POWER SUPPLY CIRCUIT AND METHOD THEREOF - In a normal mode, the power supply is fed back in a close loop, but in a power saving mode, the power supply is fed back in an open loop. When it is detected that the power supply is continuously fed back in the open loop and in a substantially zero output status, the power supply circuit enters a power down status. If the back-stage circuit needs power supply again, then the feedback is switched to the close loop and the power supply circuit enters the normal mode.11-18-2010
20100289466CLOSED LOOP NEGATIVE FEEDBACK SYSTEM WITH LOW FREQUENCY MODULATED GAIN - A power supply apparatus and method of regulating is provided. A clock generator circuit is configured for generating a clock signal at a predetermined frequency. An amplifier circuit is coupled with the clock generator circuit. The amplifier circuit includes a gain circuit coupled with the clock generator circuit. The amplifier circuit is configured to receive the clock signal at a switching element of the gain circuit. A controller circuit is configured for receiving a modulated error signal of the amplifier circuit and is configured for generating a pulse width modulated signal for controlling a duty cycle of the switching circuit. The switching circuit is configured for receiving the modulated error signal. The error signal is modulated using the clock signal to vary a gain value of the gain circuit according to the predetermined frequency. An output circuit is coupled with the switching circuit and is configured for generating a regulated voltage signal. The controller circuit uses the modulated error signal to substantially reduce harmonic distribution in a switching frequency of the switching circuit. Harmonic distribution in the switching circuit can be reduce by 10.0 db or greater.11-18-2010
20100244797CURRENT LIMITING CIRCUIT - A current limiting circuit for a boost converter includes a voltage divider circuit between a main switch which flows a current to an inductor and a comparator included in a current detecting circuit. The voltage divider circuit includes two transistors of the same type as that of the main switch, which are connected in series. One of the two transistors is a sub-switch which is connected between a voltage division point and a drain terminal of the main switch, and is turned on/off in synchronization with the main switch in accordance with an output signal of a control circuit. The other transistor is a detection resistance transistor which is connected between the voltage division point and a source terminal of the main switch, and whose gate terminal is connected to a bias voltage so that the detection resistance transistor is always on.09-30-2010
20100244791System and Method for Regulating a Power Supply - In an embodiment, a method for controlling an output voltage of a power supply system is disclosed. The method includes regulating the power supply to a first voltage. After regulating the power supply to a first voltage, the power supply is regulated to a second voltage, which includes changing an input to the power supply system, and altering charge at an output of the power supply system until the output voltage reaches the second output voltage.09-30-2010
20100244796CURRENT TRIGGER CIRCUIT AND SWITCHING POWER CONVERTER USING THE SAME - A bias voltage is compared with a voltage difference in a detecting element according to the present invention. A bias voltage unit is coupled to the detecting element, so that they have a common voltage level to avoid noises when the circuit is operating. Accordingly, the erroneous detection caused by the noise interference can be avoided. Hence, a detecting element with a low resistance, such as an MOEFET, can be used in the present invention to decrease power consumption arisen from current detection and to further increase conversion efficiency.09-30-2010
20120161734LOW DROP OUT VOLTAGE REGULATO - A low drop out (LDO) voltage regulator having an error amplifier, a power transistor, a first voltage division unit, a compensation control unit and a compensation bias current source is provided. The error amplifier generates a control voltage according to a first reference voltage and a feedback voltage. The power transistor generates an output voltage at a drain of the power transistor according to the control voltage. The first voltage division unit divides the output voltage to generate the feedback voltage. The compensation control unit generates a compensation control signal to the compensation bias current source according to the control voltage, the output voltage and a compensation bias, so as to make the compensation bias current source generate a compensation bias current, in which the compensation bias is inversely proportional to a supply voltage and ambient temperature.06-28-2012
20120126764DC/DC POWER CONVERSION APPARATUS - An object of the present invention is to provide a DC/DC power conversion apparatus that can reduce the average power consumption over a wide range of DC voltage ratios. A control circuit (05-24-2012
20120126763SYSTEM AND METHOD FOR VOLTAGE REGULATION - Systems and methods for voltage regulation provide close-tolerance voltage regulation over a wide input voltage range. A voltage regulator has a reference voltage unit, first and second transistors, and an active circuit element. The reference voltage unit is configured to provide a substantially constant voltage signal at a reference node. The first transistor is coupled to the reference node and to an input node having an input voltage. The active circuit element is coupled to the first transistor. The second transistor has a source coupled in feedback configuration to a first input of the active circuit element, a drain coupled to the input node, and a gate configured to be driven by the active circuit element to force the source to a voltage about equal to a voltage of a second input of the active circuit element independent of the input voltage.05-24-2012
20120161733Voltage Regulator that Can Operate with or without an External Power Transistor - A voltage regulator, according to the present invention, can operate with or without an external power transistor to generate a regulated output voltage. The voltage regulator determines whether an external power transistor is connected thereto. The voltage regulator then automatically sets a frequency compensation scheme that depends on whether an external power transistor has been detected.06-28-2012
20100207593POWER CONVERTING DEVICE - A power converting device including a pulse width modulation circuit, a switch unit, a power output unit and a voltage start unit is provided. The pulse width modulation circuit increases a start voltage in a soft start mode and is operated under the start voltage to generate a pulse width modulation signal. The switch unit is for receiving an input voltage, and forming a charge path and a discharge path alternately according to the pulse width modulation signal. The power output unit converts the input voltage to a core voltage in accordance with the charge path and the discharge path. The voltage start unit is for detecting the start voltage, and for transmitting a control signal to interrupt the formation of the discharge path when the start voltage is smaller than the core voltage.08-19-2010
20110181260Controller of the power inverter circuit and a control method - A highly accurate control is achieved in such a way that a timing value is generated from a differential control amount calculation result and a filter calculation result at iteration intervals not exceeding the iteration intervals of the filter calculation and then the timing set value of a driving signal generation circuit is updated by this timing value. A device for controlling a power conversion circuit comprises an AD conversion circuit (07-28-2011
20110181259VOLTAGE REGULATOR AND RELATED VOLTAGE REGULATING METHOD THEREOF - A voltage regulator includes: a first comparator for comparing a first reference voltage with a feedback voltage to generate a first comparing result accordingly; a first transistor for controlling an output voltage at an output node in response to the first comparing result; a second transistor for adjusting the output voltage at the output node in response to a control signal; a feedback block, for providing the feedback voltage according to the output voltage; and a control block, for receiving the output voltage and providing the control signal according to the output voltage.07-28-2011
20110181258Low-power feedback and method for DC-DC converters and voltage regulators for energy harvesters - A converter (07-28-2011
20120212201POWER SUPPLY APPARATUSES FOR PREVENTING LATCH-UP OF CHARGE PUMP AND METHODS THEREOF - A power supply apparatus and a power supply method are disclosed. The power supply apparatus may include an internal power supply including a first voltage generator configured to generate a first voltage based on a pulse width modulation control signal, a charge pump configured to receive the first voltage and generate a second voltage, and an inrush current controller configured to be connected between the charge pump and the internal power supply and configured to generate the pulse width modulation control signal based on a target signal and a selection reference voltage.08-23-2012
20120212200Low Drop Out Voltage Regulator - A low dropout voltage regulator (LDO) is presented that takes into consideration short channel effects of the pass transistor in suppressing ripples that are present at the input node of the LDO from appearing at the output node of the LDO. The LDO feeds the input ripple voltage to the gate of the pass transistor in such a way that the ripple currents through the pass transistor associated with both the transconductance and the output resistance of the pass transistor are suppressed. In one embodiment, the LDO is provided stability by using only on-chip capacitors. The size of on-chip capacitors is advantageously reduced by connecting a compensation capacitance to an internal node of an error amplifier. The LDO provides stable operation even at small load currents. The LDO also provides good suppression of ripples for a wide range of frequencies.08-23-2012
20120313598SYSTEM THAT REGULATES OUTPUT VOLTAGE AND LOAD CURRENT - A system including a first circuit, a second circuit, and a third circuit. The first circuit receives a supply voltage and a timer signal and is configured to provide an output voltage that is greater than the supply voltage. The second circuit receives the output voltage and enables an output current if the output voltage is sufficiently greater than the supply voltage. The third circuit detects the output current and is configured to provide a load current and a feedback current in response to the output current. The first circuit receives the feedback current and a feed back loop including the first circuit and the second circuit and the third circuit regulates the output voltage and the load current via the feedback current.12-13-2012
20120133345HYSTERETIC POWER CONVERTER WITH CALIBRATION CIRCUIT - A hysteretic power converter includes a comparator, a calibration circuit, and an output node having an output voltage. The calibration circuit is configured to supply a calibrated voltage to the comparator. The comparator controls the output voltage based on the calibrated voltage and a feedback voltage representing at least a portion of the output voltage.05-31-2012
20120133346SUCCESSIVE APPROXIMATION REGISTER A/D CONVERTER AND DC/DC CONVERTER - The SAR control circuit of the successive approximation register A/D converter changes the digital value by the first conversion frequency in a first conversion range according to the comparison result signal, and outputs the digital value.05-31-2012
20120313605METHOD OF SWITCHING A PWM MULTI-PHASE VOLTAGE CONVERTER - A circuit may generate a clock signal with a variable period given by a ratio between an initial switching period and a number of phase circuits through which a current of a multi-phase PWM voltage converter flows. The circuit may include an adjustable current generator driven by a signal representing the number of phase circuits through which the current flows and configured to generate a current proportional to the number of phase circuits through which the current flows, and a tank capacitor charged by the adjustable current generator. The circuit may include a comparator of a voltage on the tank capacitor with a threshold value configured to generate a pulse of the clock signal when the threshold value is attained, and a discharge path of the tank capacitor, the discharge path being enabled during the pulses of the clock signal.12-13-2012
20120313602Power Converter With Capacitive Energy Transfer And Fast Dynamic Response - A converter circuit and related technique for providing high power density power conversion includes a reconfigurable switched capacitor transformation stage coupled to a magnetic converter (or regulation) stage. The circuits and techniques achieve high performance over a wide input voltage range or a wide output voltage range. The converter can be used, for example, to power logic devices in portable battery operated devices.12-13-2012
20090058387Maintaining a constant output voltage by sampling and holding a voltage across an auxiliary winding - A lower-cost and more precise control methodology of regulating the output voltage of a flyback converter from the primary side is provided, which works accurately in either continuous voltage mode (CCM) and discontinuous mode (DCM), and can be applied to most small, medium and high power applications such cell phone chargers, power management in desktop computers and networking equipment, and, generally, to a wide spectrum of power management applications. Two highly integrated semiconductor chips based on this control methodology are also described that require very few components to build a constant voltage flyback converter.03-05-2009
20090058386Green technologies: 7less microsystems - The green technology is the technology for the green society having the green safety. The green technology is not only save the resource and recycle the resource but also save the energy and recycling the energy. The core technology of the Green Technology is the 7Less Microsystems. The 7Less Microsystems are the Xtaless Clock Generator, the Resistorless Current Sensor, the Capacitorless Low Drop Voltage Regulator, the Inductorless Switch Mode Power Supply, and the Avalanche Diodeless True Random Noise Generator, the Sawless Low Noise Amplifier, and the Brakeless Hybrid Electrical Vehicle. The Gain-Boost-Q LC VCO is the fundamental technology of the Xtaless Clock Generator, Spurfree/Jitterless Frequency and Phase Lock Loop, multi-phase high-speed high frequency clock and the Sawless Low Noise Amplifier. The switch inductor is the fundamental technology of the high power efficiency of the Switch Mode Power Supply. The high efficiency converter technology is the fundamental of the high efficiency power amplifier. The residue energy is recycling in the system to save the power from the wasted dissipation. The high efficiency power amplifier is the fundamental technology of the high efficiency plasma light and the 403-05-2009
20090058385Step-up DC-DC converter - A step-up DC-DC converter is disclosed that is capable of high efficiency power conversion under both a heavy load condition and a light load condition. The step-up DC-DC converter includes a direct current power source, an inductor, a first switching element, a second switching element, a smoothing capacitor, a driver controller for controlling switching ON or switching OFF the first switching element and the second switching element, and a control changing unit for changing a control operation of the driver controller according to a load current. According to an output from the control changing unit, the driver controller performs one of an operation of switching OFF the second switching element and an operation of switching ON or switching OFF the second switching element.03-05-2009
20120169312DRIVING VOLTAGE ADJUSTING CIRCUIT - A driving voltage adjusting circuit includes a digital rheostat, a control chip, a low dropout regulating circuit, and a driving circuit. The control chip is connected with the digital rheostat, and configured for adjusting the resistance of the digital rheostat. The low dropout regulating circuit is connected with the digital rheostat and outputs an output voltage according to the resistance of the digital rheostat. The driving circuit comprising a number of switch elements connected with each other and a driver configured for driving the switch elements, each of the switch elements comprising a first terminal, a second terminal, and a control terminal configured for controlling connection and disconnection of the first terminal and the second terminal; the first terminal and the second terminal connected with the control chip, the driver is connected with the low dropout regulating circuit and output an driving voltage to the control terminal.07-05-2012
20100213909VOLTAGE REGULATOR - Provided is a voltage regulator in which a maximum output current and a short-circuit output current may be accurately set. As a circuit for determining respective current values of a maximum output current (Im) and a short-circuit output current (Is) of an overcurrent protection circuit, the voltage regulator includes a current mirror circuit for mirroring a current in accordance with an output current so as to be capable of current control, without employing a resistor for converting a current into a voltage. Therefore, the maximum output current (Im) and the short-circuit output current (Is) may be accurately set with respect to an output current (Iout).08-26-2010
20120313600SWITCHING CIRCUIT AND DC-TO-DC CONVERTER - According to one embodiment, a switching circuit includes a high-side switch, a rectifier, and a driver. The high-side switch is connected between a high potential terminal and an output terminal. The rectifier is connected between the output terminal and a low potential terminal, forward direction of the rectifier is a direction from the low potential terminal to the output terminal. The driver is connected between the high potential terminal and the output terminal. The driver switches a high-side switch ON based on a high-side control signal. The driver switches the high-side switch OFF when a first short detector detects shorts of the output terminal with the low potential terminal after a first period longer than a backward recovery time of the rectifier until the high-side control signal changing.12-13-2012
20110204863Power Regulator System and Method - A power regulator system and method are provided. In one embodiment, a power regulator system comprises a voltage regulator configured to generate a regulator voltage at a regulator node based on a feedback voltage and an output stage configured to generate a run voltage at a run voltage node and a standby voltage at a standby voltage node based on the regulator voltage. The system also comprises a mode control stage configured to set the power regulator system in one of a run mode and a standby mode in response to a mode signal and a feedback control stage configured to provide the feedback voltage based on the run voltage in the run mode and based on the standby voltage in the standby mode.08-25-2011
20110204862DIGITAL CONTROL METHOD FOR IMPROVING HEAVY-TO-LIGHT (STEP DOWN) LOAD TRANSIENT RESPONSE OF SWITCH MODE POWER SUPPLIES - A method for improving heavy-to-light load transient response in low-power switch-mode power supplies is described. It uses a negative voltage input power rail and a digital controller with an extended duty ratio control value to provide faster discharging current slew rate in the switched mode power supplies (SMPS) inductor.08-25-2011
20100052638DC-DC Converter Circuits, and Methods and Apparatus Including Such Circuits - Electrical power from an input voltage supply is converted to first and second output voltages of opposite polarities using a single inductor (L) and only four principal switches (S03-04-2010
20100052637Apparatus and Method for Sensing a Current Within a Coil - A method of sensing a current within a coil, said current being applied to the coil such that it is switched via a switching transistor, includes a detection transistor, a circuit and a control element. The detection transistor is configured to sense the current. The circuit is configured to provide, at a predetermined point in time during a current sensing period, a voltage across the switching transistor. The control element is configured to match, in response to the voltage provided by the circuit, the working points of the switching transistor and of the detection transistor, and to output an output signal which corresponds to the current to be sensed.03-04-2010
20120176110VOLTAGE REGULATION CIRCUIT - A voltage regulating circuit includes a pulse width modulation controller, a current sense circuit, a voltage feedback circuit, and a gain-and-bias circuit. The current sense circuit includes an inductor and a capacitor. The voltage feedback circuit includes first and second resistors. The gain-and-bias circuit includes an operational amplifier. A first terminal of the capacitor is connected to an inverting input terminal of the operational amplifier through a third resistor. A second terminal of the capacitor is connected to a non-inverting input terminal of the operational amplifier through a fourth resistor. The inverting input terminal of the amplifier is connected to an output terminal of the operational amplifier through a fifth resistor. The non-inverting input terminal of the operational amplifier is grounded through a sixth resistor. The output terminal of the operational amplifier is connected to the node between the first and second resistors through a seventh resistor.07-12-2012
20120176109Voltage Regulator - A voltage regulator circuit for providing a regulated output voltage is provided. The voltage regulator circuit includes an error amplifier configured to provide a control signal based on at least a portion of a fed-back output voltage and a reference voltage. A first output stage is configured to operate at a first supply voltage and provide the regulated output voltage based on the control signal. At least one second output stage configured to operate at a second supply voltage different from the first supply voltage and provide the regulated output voltage based on the control signal. A switch-over unit is configured to switch over the control signal between the first output stage and the second output stage.07-12-2012
20120313604EFFICIENT BIAS POWER SUPPLY FOR NON-ISOLATED DC/DC POWER CONVERSION APPLICATIONS - Unique methods are disclosed to construct an efficient bias supply for a main non-isolated DC/DC power conversion system. Additional bias supplies developed by employing an arbitrary number of transformers and/or an arbitrary number of secondary windings can be used to provide bias power to other isolated and non-isolated power conversion systems. By employing a transformer in forward conversion mode the basic circuit of the efficient bias supply is built without using any extra switching controllers and power switches. Furthermore a new architecture for monitoring and selecting the bias power source to ensure smooth start-up and operation during abnormal conditions and/or maintaining optimum and efficient steady state operation of a power conversion system is disclosed.12-13-2012
20120074918Method And Apparatus For Booting Up Digital Circuit Nodes Coupled To A Single Conductor Current Line - Light Emitting Diodes (LEDs) are increasingly used in illumination applications. To control multiple Light Emitting Diodes (LEDs), or any other controllable light source, this document introduces a single-wire multiple-LED power and control system. Specifically, individually controlled LED units are arranged in a series configuration that is driven by a control unit located at the head of the series. Each of the individually controlled LED units may comprise more than one LED that is also individually controllable. The head-end control unit provides both electrical power and control signals down a single wire to drive all of the LED units in the series in a manner that allows each LED unit to be controlled individually or in assigned groups.03-29-2012
20120074917Adaptive slope-compensation module and method thereof - An adaptive slope-compensation method is applied for a switch-mode power supply. The switch-mode power supply has a power switch, and an inductor coupled to an input power. The power switch controls the inductor storing energy or releasing energy to generate an output voltage. The adaptive slope-compensation method includes detecting an inductor current passing through the inductor and to generate an inductor-current detecting voltage, detecting a duty cycle of the power switch, detecting a voltage variation of the inductor-current detecting voltage when the power switch is turned on, generating a slope-compensation signal according to the voltage variation and the duty cycle, and adjusting the timing of turning the power switch on or off. In this way, even if the operation conditions of the input power and the output voltage change, the system still can quickly response and does not generate sub-harmonic oscillation.03-29-2012
20100270990METHOD AND ARRANGEMENT FOR GENERATING CURRENT - The invention relates to power supplies where the output current is controllable. In prior art, there is a problem to provide both high rate of change in the current output and high efficiency. The solution of the present invention is based on combining current elements, whereby the current is controlled by switching the outputs of the current elements. The current elements can be implemented with e.g. buck converters, whereby the power dissipation is small.10-28-2010
20100270991DC-DC CONVERTER - A switching regulator for stepping down a DC input voltage to a DC output voltage, the switching regulator including: a switching element; a control circuit that controls activation or deactivation of the switching element; a voltage generation unit that steps down the DC input voltage and supplies the stepped down DC input voltage to the control circuit; and a switching unit that is configured to: supply the DC output voltage to the control unit when the DC output voltage is equal to or higher than a first reference voltage; and stop supply of the DC output voltage when the switching element is in an active state.10-28-2010
20100270989Switching power supply - A switching power supply that can suppress output variation at a time of transition of a control mode from a non-linear control mode to a linear control mode. The switching power supply includes instruction value forming circuitry that forms, in a linear control mode, a linear control instruction value for linearly control a switching circuit based on an error of an output voltage, and forms, in a non-linear control mode, a non-linear control instruction value for non-linearly control the switching circuit. The instruction value forming circuitry predicts, in the non-linear control mode, a linear control instruction value suited to the load current in the non-linear control mode, and uses the predicted linear control instruction value for an initial value of the linear control instruction value at a time of transition from the non-linear control mode to the linear control mode.10-28-2010
20100270988 PULSE TIME DETECTOR, A CONTROLLER FOR A SWITCHED MODE POWER SUPPLY, AND A SWITCHED MODE POWER SUPPLY INCLUDING SUCH A CONTROLLER - An apparatus for monitoring the pulse time of switches within a DC to DC power supply, comprising a timing circuit responsive to a switching confirmation signal to commence timing and to monitor for control signals being sent to the switch and to indicate whether elapsed period between the switching confirmation signal and the control signal is too long or too short.10-28-2010
20100270987APPARATUS, SYSTEM AND METHOD FOR OUTPUTTING A VITAL OUTPUT FOR A PROCESSOR - An apparatus outputs a vital output for a processor including an output state. The apparatus includes a first input receiving the output state, two independent circuits each of which includes a second input electrically interconnected with the first input, a third input, a fourth input and an output including the output state. Each of the independent circuits repetitively monitors the output and the third and fourth inputs of a corresponding one of the independent circuits to confirm agreement therebetween. Each of two switches is controlled by the output of the corresponding one of the independent circuits. The switches cooperate to form the vital output. Each of two feedback circuits is between the output and the third input of the corresponding one of the independent circuits, and also between the output of the corresponding one of the independent circuits and the fourth input of the other one of the independent circuits.10-28-2010
20120313601SWITCHING REGULATOR - In order to provide a switching regulator having high efficiency even under light load, the switching regulator is configured so that ON/OFF of a switching element is controlled by an output signal of an oscillation circuit having an oscillation frequency controlled by an output signal from an error amplifier. Thereby, the oscillation frequency can be suppressed under light load, thus reducing a switching loss.12-13-2012
20100283441PWM CONTROLLER AND CONTROL METHOD FOR A DC-DC VOLTAGE CONVERTER - A PWM controller and control method for a DC-DC voltage converter filter the high-frequency component of the voltage at the phase node between high-side and low-side elements of the voltage converter to generate a signal synchronous and in phase or out-of-phase with the inductor current of the voltage converter, to achieve a low-ripple output voltage and stable loop control.11-11-2010
20120313599Self-Driven Synchronous Rectification Boost Converter - The present invention provides a self-driven synchronous rectification boost converter. The self-driven synchronous rectification boost converter has a first switch receiving a pulse driving signal, a first winding and a synchronous rectification circuit constructed by an auxiliary winding and a second switch. The first winding stores energy when the first switch is switched on and releases energy when the first switch is switched off to achieve boosting. In the meantime, the auxiliary winding cooperates with a switch circuit to switch on/off the second switch according to a voltage inducted from the first winding, so as to achieve an object of synchronous rectification. Under a condition of outputting high current, the present invention can greatly reduce power-consumption of rectifying and enhance efficiency.12-13-2012
20120313603GENERATION OF VOLTAGE SUPPLY FOR LOW POWER DIGITAL CIRCUIT OPERATION - A voltage regulator for low power operation of digital circuits includes an output node for providing a regulated output voltage, a diode-connected P-channel transistor in series with a second diode-connected N-channel transistor coupled between the output node and ground, and a bias current having a value for biasing the first and second diode-connected transistors in a sub-threshold mode of operation. The low power voltage regulator further includes a buffer amplifier or emitter or source follower stage to provide a low impedance regulated voltage. The bias current may be generated by a bandgap circuit.12-13-2012
20120181999High accuracy inductor peak current control scheme for switching power supply - The invention is composed of peak current generator, peak current detector, peak current error amplifier and compensator, peak current controller and MOSFET driver. The advantage of the invention is to control switching converter's inductor peak current in high accuracy. The invention can automatically compensate error due to inductor current rising slope, the delay times Td, Tp of comparator and driver and comparator's offset voltage. The invention can largely decrease performance requirements of comparator and driver circuit and help to down the cost to implement the system.07-19-2012
20120182000SOFT START CIRCUIT - There is provided a soft start circuit including: a resonator generating a resonant voltage; a voltage detector detecting an output voltage of a power converter; a reference voltage selector selecting one of a voltage detected by the voltage detector and the resonant voltage as a reference voltage, based on a driving signal for turning the power converter on or off; and an error amplifier generating a control signal for controlling the output voltage of the power converter from the reference voltage selected by the reference voltage selector and the voltage detected by the voltage detector. The soft start circuit is capable of preventing semiconductor devices of the power converter from being burned out and preventing overshooting of the output voltage.07-19-2012
20090322297SERIES REGULATOR CIRCUIT AND SEMICONDUCTOR INTEGRATED CIRCUIT - A series regulator circuit includes one or more transistors each having a channel with one end coupled to an input node to receive an input voltage and another end coupled to an output node, and having a control node to receive a control voltage, a control circuit configured to adjust the control voltage in response to a voltage of the output node such that the voltage of the output node is set equal to a voltage setting selected by an output voltage setting signal, and a switch circuit configured to change an operating condition, excluding the control voltage, of the one or more transistors in conjunction with a change in the voltage setting of the output node.12-31-2009
20100194364Switching Power-Supply Control Circuit - A switching-power-supply control circuit comprising: a first control circuit to operate a first transistor applied with an input voltage at an input electrode thereof and a second transistor connected in series to the first transistor, based on a first feedback voltage and first reference voltage, the first feedback voltage corresponding to an output voltage obtained through a connection point between the first and second transistors; and a second control circuit to allow the first control circuit to turn on/off the first and second transistors in a complementary manner so that the first feedback voltage becomes equal to the first reference voltage, when a second feedback voltage rising with rise of the output voltage is lower than a second reference voltage, and allow the first control circuit to turn off the second transistor, when the second feedback voltage is higher than the second reference voltage, according to the output voltage.08-05-2010
20120256609ERROR AMPLIFIER WITH BUILT-IN OVER VOLTAGE PROTECTION FOR SWITCHED-MODE POWER SUPPLY CONTROLLER - An error amplifier includes a first amplification circuit with a reference signal input and a feedback signal input representing the amplitude of a load voltage of a switched mode power supply. The error amplifier includes a difference amplifier providing a difference signal representing a difference between the reference signal and the feedback signal, provided for determining the duty cycle of a switching signal in the switched mode power supply. The first amplification circuit further includes a control circuit providing a control signal generated as a function of the difference between the reference signal and the feedback signal.10-11-2012
20120299568STEP-UP/DOWN DC-DC CONVERTER AND SWITCHING CONTROL CIRCUIT - A step-up/down DC-DC converter and switching control circuit are described. According to one implementation, a switching control circuit generates on/off signals of a first switching device supplying a current to a voltage conversion inductor of a step-up/down DC-DC converter and a second switching device receiving a current from the inductor. The switching control circuit includes an error amplifier circuit, an inverter amplifier circuit, a waveform generator circuit, a first voltage comparator circuit, a second voltage comparator circuit, and a voltage generator circuit. An inverting reference voltage supplied to the inverting amplifier circuit is set to an electric potential so as not to fall below a highest electric potential of triangle waves supplied to the first and second voltage comparator circuits.11-29-2012
20120299567Power Conversion System and Power Control Method for Reducing Cross Regulation Effect - A power conversion system and power control method for reducing cross regulation effect uses a voltage feedback adjustment circuit to modulate an error signal fed back from an output voltage so as to predict the energy of an output corresponding to its load states. While the energy delivered to an output terminal with its load remaining the same does not change, the energy delivered to an output terminal with its load changing is adjusted accordingly. The power conversion system thus effectively reduces the cross regulation effect and obtains excellent steady system output and transient response.11-29-2012
20120299566POWER SUPPLY - A power supply applied to an electronic device for providing power includes a transformer unit, a connector, a pulse-width modulation (PWM) control unit, and a switch unit. The connector is electrically connected with the secondary side of the transformer unit for outputting a first output voltage. The PWM control unit outputs a pulse signal with a first period. The switch unit is electrically connected between the PWM control unit and the primary side of the transformer unit. When the electronic device is connected to the power supply, the connector receives an external control signal, and the PWM control unit adjusts the pulse width of the pulse signal to a second period and transmits the pulse signal with the second period to the switch unit to control the connector to output a second output voltage to the electronic device.11-29-2012
20120229112USING LOW VOLTAGE REGULATOR TO SUPPLY POWER TO A SOURCE-BIASED POWER DOMAIN - A common (ground) of a low voltage regulator is connected to a virtual common (ground) of an integrated circuit device that is also connected to transistor sources but isolated from a true ground connected to the substrate of the integrated circuit device. The regulated output voltage from the low voltage regulator rises the same as the virtual ground voltage rises when back-biased sufficient to reduce leakage current to an acceptable level in a given process technology. Therefore, the output of the low voltage regulator will maintain a normal operating voltage for the logic during a power saving back-biased condition.09-13-2012
20120229111Voltage Transformer and Method for Transforming Voltage - A voltage transformer (09-13-2012
20120229109LAMBDA CORRECTION FOR CURRENT FOLDBACK - Method and apparatus to provide lambda correction of a current foldback circuit using a regulator including a current foldback circuit are disclosed herein.09-13-2012
20110121807DEVICE FOR PROTECTING A DC VOLTAGE CONVERTER - A device for controlling and regulating a DC voltage converter. The device may have one or more power output stages and a control unit with a signal ground line. The one or more power output stages and the control line have a mutual ground potential. A switch for electrically disconnecting the signal ground line is provided. The switch is opened, when the DC voltage converter is active and the switch is closed, when the DC voltage converter is inactive.05-26-2011
20110121806REGULATOR INCLUDING HYSTERETIC CONTROL - This document discusses, among other things, a regulator circuit. The regulator circuit can controllably connect a first voltage to an inductor using a first switch and can controllably connect a second voltage to the inductor using a second switch. The first switch can be turned off and the second switch can be turned on for a duration proportional to a difference between the first voltage and a third voltage, divided by the first voltage. The first switch can be turned off and the second switch can be turned on for a duration proportional to the third voltage divided by the first voltage. One of the first or third voltages can correspond to a desired output voltage.05-26-2011
20110121805Active Power Switch Topology for Switching Regulators - Embodiments of an active power switch topology for a switching regulator are provided herein. The embodiments of the active power switch topology use two or more active power switches in parallel instead of a single active power switch, as found in conventional implementations. The active power switches are controlled such that they turn-on and -off in a manner that reduces parasitic voltage spikes associated with conventional switching regulators, while not degrading efficiency or other parameters associated with the switching regulator. The active power switch topology can be beneficially used within many switching regulators (e.g., buck, boost, or buck-boost) and, in particular, within hard-switched switching regulators that include active power switches integrated on chip.05-26-2011
20110121804SEMICONDUCTOR DEVICE AND POWER SOURCE DEVICE - A power source device capable of improving the power conversion efficiency at a light load independent of an input power source voltage is realized. For example, a clock signal is output from a common control unit to a PWM-mounted drive unit including a reverse-current detection circuit in addition to a peak current control method. This clock signal is selected by a mode setting signal from either of a clock signal with a constant frequency or a clock signal which is generated via a one-shot pulse generation circuit every time an output voltage at an output power source node decreases. When the latter is selected, the switching frequency at a light load decreases and the power conversion efficiency improves. Furthermore, the peak current control method can reduce the input power source voltage dependence of the switching frequency.05-26-2011
20100327834VOLTAGE REGULATOR USING DEPLETION MODE PASS DRIVER AND BOOT-STRAPPED, INPUT ISOLATED FLOATING REFERENCE - Multiple embodiments of a linear voltage regulator are described that use a bipolar output transistor to deliver current and a regulated voltage to a load. The bipolar output transistor assures low output impedance providing isolation from load induced noise. A first depletion mode field effect transistor FET drives the output transistor dependent on a correction signal from an error amplifier. The error amplifier compares a fixed voltage reference to a portion of the output voltage to set a control voltage for the FET gate. Output voltage is set with an offset voltage referenced to circuit ground and can be generated with a single resistor to circuit ground by a current through the resistor which is set from VREF and the regulated output voltage. Output current is limited with a second depletion mode FET that senses the difference in regulator output voltage and voltage at said first FET transistor drain. All circuitry except the output transistor and 2 FET drivers are bootstrap powered from the regulated output voltage to isolate almost all circuit elements from noise present on the input power source.12-30-2010
20100327832CONSTANT CURRENT OUTPUT CONTROL TYPE SWITCHING REGULATOR - A constant current output control type switching regulator that reduces the number of parts, resolves the loss of the current running in the resistor, and eliminates the need to change the time constant of the integrator due to changing the inductor value. The switching regulator creates the adjustment reference voltage by multiplying the proportion of Vout/Vin by the reference voltage, and when the clock signal is high, the current sense voltage is sampled when the current of the initial current value runs in the switching transistor, and when the clock signal is low, the potential difference between the adjustment reference voltage and the sampled current sense voltage is added to the adjustment reference voltage and creates the second reference voltage; and with the signal CPOUT controls the operation of the transistors upon execution of PWM control.12-30-2010
20100327831CONSTANT CURRENT SUPPLY TYPE OF SWITCHING REGULATOR - A disclosed constant current supply type switching regulator includes a switching element configured to activate a switch operation depending on an input control signal, an inductor configured to be charged with the input voltage in response to the switching element activating the switch operation, a rectification element configured to discharge the inductor in response to the switching element shifting to a cutoff state, a current detection circuit unit configured to generate a current proportional to a current flowing into the switching element and generate and supply a current sense voltage depending on the proportional current and a control circuit unit configured to average the current sense voltage supplied from the current detection circuit unit and perform PWM (Pulse Width Modulation) control on the switching element for supplying a constant current in order to force the averaged voltage to be equal to a first reference voltage. The control circuit unit compares the averaged voltage with the first reference voltage and uses a pulse signal indicative of the comparison to perform the PWM control for supplying the constant current.12-30-2010
20080297127METHOD OF CONTROLLING A SWITCHED-MODE POWER SUPPLY HAVING A SINGLE INDUCTIVE ELEMENT AND SEVERAL OUTPUTS, AND CORRESPONDING POWER SUPPLY, IN PARTICULAR FOR A CELLULAR MOBILE TELEPHONE - The switched-mode power supply includes a switching cell having an inductive element with two connections and several individually selectable outputs, and in which the two connections of the inductive element are joined respectively to at least two of the individually selectable outputs. It is thus possible to generate and regulate at least two different voltages, one positive and one negative.12-04-2008
20080297128SAMPLE AND HOLD SCHEME FOR A FEEDBACK NETWORK OF A POWER CONVERTER - One embodiment of the invention includes a system for regulating an output voltage of a power converter. The system comprises an error amplifier that compares a feedback voltage associated with the output voltage with a reference voltage to generate an error signal that is employed to control a magnitude of the output voltage. The system also comprises a plurality of sample and hold circuits each configured to sample an error amplifier output voltage to provide the error signal. The system further comprises a switching controller configured to control switching of the error amplifier output voltage between each of the plurality of sample and hold circuits in response to a change in an output load of the power converter.12-04-2008
20120262141Active Droop Current Sharing - Point-of-load (POL) regulators may be configured as multiphase POL DC-to-DC (direct current to direct current) converters, operating in a multiphase configuration in order to boost the total current available to a system. Current balancing may be performed by utilizing an active low bandwidth current sharing algorithm that uses matched artificial line resistance (droop resistance) while maintaining multi-loop stability during both steady-state and dynamic transient states. The current sharing algorithm may be facilitated through digital communication between the devices, where the digital bus may be a single wire bus, a parallel bus or a clock-and-data bus.10-18-2012
20100231183Power converter with improved line transient response, control circuit for power converter, and method for improving line transient response - The present invention discloses a power converter with improved line transient, comprising: a power stage circuit including at least one power transistor switch which operates to convert an input voltage to an output voltage; an error amplifier comparing a feedback signal with a reference signal to generate an error signal; an input voltage instant variation extraction circuit extracting an instant variation of the input voltage and generating a signal relating to the instant variation; and a PWM comparator generating a PWM signal according to at least a ramp signal, the error signal, and the signal relating to the instant variation, to thereby control the operation of the power transistor switch in the power stage circuit.09-16-2010
20110037446SWITCH MODE POWER SUPPLY WITH DYNAMIC TOPOLOGY - A power supply system has an inductive device, a plurality of switching devices for providing connection of the inductive device to input and output nodes and a ground node, and a switch driver circuit for driving the switching devices so as to enable the power supply to operate in a boost mode to increase the input voltage, in a buck mode to decrease the input voltage, and in a solid-state flyback mode to transfer between the boost mode and the buck mode. In the solid-state flyback mode, the switching devices are controlled to provide switching of the inductive device between an input state in which the inductive device is connected between the input node and the ground node, and an output state in which the inductive device is connected between the ground node and the output node.02-17-2011
20130169253FUEL CELL SYSTEM - In a fuel cell system which controls an operation of a converter on the basis of a duty command value including a feedforward term, the deterioration of a response of the converter at a time of a rapid increase (a rapid decrease) of a load is suppressed. There is disclosed a fuel cell system comprising a converter disposed between a fuel cell and a load device, and a controller for controlling the operation of the converter on the basis of the duty command value including the feedforward term, wherein the controller calculates the feedforward term by use of a command value of a physical amount concerning the converter in an operation range where a requested power from the load device is in excess of a predetermined threshold value.07-04-2013
20120268092CLAMPING CIRCUIT TO A REFERENCE VOLTAGE FOR ULTRASOUND APPLICATIONS - A clamping circuit includes a clamping core connected to an output terminal and having a central node connected to a voltage reference and at least one first and one second clamp transistor, connected to the central node and having respective control terminals, the clamping core being also connected at the input to a low voltage input driver block. The clamping core includes a first switching off transistor connected to the output terminal and to the first clamp transistor, as well as a second switching off transistor connected to the output terminal and to the second clamp transistor.10-25-2012
20120326684Power Converter With Capacitive Energy Transfer And Fast Dynamic Response - A converter circuit and related technique for providing high power density power conversion includes a reconfigurable switched capacitor transformation stage coupled to a magnetic converter (or regulation) stage. The circuits and techniques achieve high performance over a wide input voltage range or a wide output voltage range. The converter can be used, for example, to power logic devices in portable battery operated devices.12-27-2012
20120326685POWER SUPPLY CONTROL DEVICE AND POWER SUPPLY CONTROL METHOD - A control device includes a first terminal receiving a monitored output voltage and a second terminal transmitting a pulse width modulation (PWM) signal. A converting unit generates an A/D conversion synchronous signal, and an A/D converter samples the monitored output voltage in accordance with the A/D conversion synchronous signal. A pulse oscillator controls a position of a first edge on the PWM signal in accordance with the A/D conversion synchronous signal, and controls a position of a second edge based on the monitored voltage.12-27-2012
20120326683EQUALIZATION OF THE CURRENT IN A THREE-PHASE ELECTRICAL POWER SYSTEM - This is directed to systems, processes, machines, and other means that enable automatic shifting of current loads in a three phase power system. The invention can rapidly shift power phases to various loads such that each phase could power each load, resulting in equalizing the average current in each power phase.12-27-2012
20120319667DC-DC CONVERTER ARRANGEMENT - ADC-DC converter, for a solar charger, is disclosed. The converter is based on a buck-boost converter, and is operable both in a boost mode, and in a buck mode. The converter differs from known converters, in that during buck mode operation, the boost mode is disabled, thereby reducing or eliminating the losses associated with buck mode operation. Methods of operating such a reconfigurable buck-boost converter are also disclosed as is a computer programme product for controlling a reconfigurable buck-boost converter.12-20-2012
20120319666LOW NOISE EXTERNAL ENABLE SWITCHER CONTROL SIGNAL USING ON-CHIP SWITCHER - A method and system is disclosed for powering device sub-circuitry of an electronic device. The sub-circuitry may be used to provide control signals to a direct current switcher on a main system board, thus eliminating passive circuitry typically associated with the sub-circuitry. Furthermore, by actively generating the control signals for the direct current switcher, explicit timing control circuitry is not required to synchronize the transmitted power to the sub-circuitry.12-20-2012
20120274297Voltage Regulator Bypass Resistance Control - Embodiments for at least one method and apparatus of controlling a bypass resistance of a voltage regulator are disclosed. One method includes generating a regulated output voltage based upon a switching voltage. The switching voltage is generated through controlled closing and opening of a series switch element and a shunt switch element, the series switch element and the shunt switch element being connected between voltages based on an input voltage. Control of a duty cycle of the switching voltage is provided by sensing and feeding back the regulated output voltage. The bypass resistance is controlled based on an integration of a difference between the duty cycle and a maximum duty cycle.11-01-2012
20120081092LOW ELECTROMAGNETIC EMISSION DRIVER - The disclosure concerns circuitry for controlling a power transistor of a drive circuit arranged to drive an electrical component, the circuitry comprising: a variable current source adapted to set the level of a current for charging a control terminal of said power transistor; and a control circuit adapted to control said variable current source in a continuous manner based on a feedback voltage.04-05-2012
20120081091CONTROL CIRCUIT, DCDC CONVERTER, AND DRIVING METHOD - A current generator circuit included in a triangle-wave generator circuit in a control circuit includes plural stages of current mirrors connected in parallel with each other. The plural stages of current mirrors are placed so that the sum of output currents output therefrom becomes an output current of the current generator circuit. A switching element that controls the on/off state of a current in accordance with the amount of load current of a DCDC converter is connected to each of the current mirrors.04-05-2012
20120081090VOLTAGE REGULATOR - The voltage regulators are capable of limiting undershoots of the output voltage without having a similar effect on overshoots because of the presence of a current cancellation network, input with the reference voltage and coupled to the second input of the error amplifier. This current cancellation network is adapted to inject into the second input a unidirectional compensation current of the first and second currents injected by the first and second feedback networks, respectively, the compensation current being determined by time variations of the difference between a replica of the output regulated voltage and the reference voltage and/or by time variations of the reference voltage.04-05-2012
20120081089POWER SUPPLY CIRCUIT - A power supply circuit includes: an analog/digital converter for converting an analog signal to a digital signal; a pulse width modulation signal control circuit for generating a setting control signal varying in accordance with the difference between a reference voltage and a feedback voltage and a control signal for controlling a pulse width modulation signal, which is based on the digital signal; and a pulse width modulation signal generation circuit for generating the pulse width modulation signal, to which the count signal and the control signal are input, in which the control signal controls the duty cycle of the pulse width modulation signal, and the setting control signal controls the cycle of updating the duty cycle of the pulse width modulation signal.04-05-2012
20120081088POWER SUPPLY APPARATUS, POWER SUPPLY SYSTEM AND METHOD OF SUPPLYING POWER THEREOF - A method of supplying power from a solar cell module to a load includes measuring the output of the solar cell module, and controlling a power converter having a preset duty ratio to start operating in accordance with the measured output. Additionally, a power supply apparatus and a power supply system include a solar cell module having at least one solar cell to absorb sunlight, a power converter which converts power output from the solar cell module and supplies the converted power to a load, and a driving controller which measures the output of the solar cell module and controls the power converter having a preset duty ratio to start operating according to the measured output. Thus, electrical stress on the power converter is significantly decreased even though incident solar energy and/or the load is largely varied, so that the power converter may be stably driven to output the power.04-05-2012
20120081087HUB DEVICE CAPABLE OF SUPPLY POWER - The present invention relates to a hub device capable of supplying power, which comprises: a power input unit, a Boost/Buck unit, a power output unit, a control unit, a plurality of first electrical connection units, and a second electrical connection unit. By way of the control unit and the plurality of first electrical connection units, the hub device can provide a hub function for a plurality of the USB connectors; moreover, By means of the power input unit, the Boost/Buck unit and the power output unit, the hub device is able to supply the a portable computer with the necessary power thereof. So that, when a user goes out with the portable computer, the specific power supply of the portable computer may not be carried out; thereof, that makes the living of the user more convenient.04-05-2012
20100231188BUCK DC-TO-DC CONVERTER AND METHOD - A method and apparatus for converting a DC voltage to a lower DC voltage, provides for conducting current from an input terminal, through an inductor to charge a capacitor connected to the inductor at an output terminal and to provide a varying range of load current from the output terminal, alternately switching the input terminal between a supply voltage and a ground potential to produce a desired voltage at the output terminal that is lower than the supply voltage, while providing the varying range of load current, and disconnecting the input terminal from both the supply voltage and the ground potential to reduce an increase in voltage at the output terminal caused by a substantial reduction in the load current, while current through the inductor adjusts in response to the reduced load current.09-16-2010
20100231184Step up and down switching power converter's output current detect and control scheme - The invention presents a simple and high accuracy output current detect and control scheme to control the output current of the step up-down (Buck-Boost) and step up (Boost) switching converter, It makes step up-down (Buck-Boost) and step up (Boost) switching power converter operate in wide input voltage range and low in total BOM cost and the switching converter can be used as a controllable current source for several applications09-16-2010
20120280668POWER SUPPLY CONTROL APPARATUS - A power supply control apparatus includes an output transistor coupled between a first power supply line and an output terminal, the output terminal being configured to be coupled with a load, a discharge transistor coupled between a gate of the output transistor and the output terminal, and rendered conductive when the output transistor is brought into a non-conduction state, a negative voltage control unit coupled between the first power supply line and the gate of the output transistor, and bringing the output transistor into a conduction state when the counter electromotive voltage applied to the output terminal from the load exceeds a predetermined value, a diode having a cathode coupled with the first power supply line, and an anode, a third resistor provided between the anode of the diode and a second power supply line, and a compensation transistor coupled between the second power supply line and the output terminal.11-08-2012
20120091982POWER FACTOR CORRECTION CONVERTER CONTROL OFFSET - An apparatus includes a control unit to generate a control signal to control a duty cycle of a PWM switching signal that controls a switch in a PFC converter. The control unit includes a PWM converter to produce a PWM signal responsive to an output voltage of the PFC converter. A switching circuit switches a current representing an input current of the PFC converter in response to the PWM signal. A circuit generates the control signal in response to the switched current. The control unit includes an amplifier that receives a current sense signal and provides the current representing the input current of the PFC converter. An offset unit generates a variable offset signal to generate the control signal. The offset unit provides the offset signal as an offset current for offsetting a current at an input of the amplifier.04-19-2012
20120091981SWITCHING REGULATOR - A switching regulator has an output circuit having first and second transistors and a connection node thereof as an output terminal; a switching control unit generating a first and second switching pulses for alternately switching the first and second transistors according to the load; and a first comparator monitoring an output voltage, and generating a pulse stopping control signal for stopping the generation of the switching pulses when the output voltage rises, and for generating the switching pulses when the output voltage drops. And the switching control unit performs a stopping operation for stopping the switching pulse generation and a switching operation for generating the switching pulse in response to the pulse stopping control signal, and outputs, to the first comparator, a timing control signal for quickening a switching timing from the stopping operation to the switching operation as the load of the load circuit increases.04-19-2012
20120091980SYSTEM AND METHOD FOR CONTROLLING VOLTAGE RAMPING FOR AN OUTPUT OPERATION IN A SEMICONDUCTOR MEMORY DEVICE - A voltage driving circuit comprises a current bias generating unit and a voltage driving unit. The current bias generating unit is configured to receive a mode signal and to generate a mode selection current in response to the mode signal. The voltage driving unit is coupled to the current bias generating unit, and is configured to receive the mode selection current and to drive an output voltage at a slew rate that is set according to the mode selection current. The voltage driving unit can include a plurality of stages, where each stage is configured to drive the output voltage at a respective different slew rate according to the mode signal.04-19-2012
20120286751VOLTAGE REGULATOR - Provided is a voltage regulator including an overcurrent protection circuit, which does not need a test circuit. The voltage regulator has a configuration in which a reference voltage circuit includes an element that determines a reference voltage and an overcurrent protection circuit includes an element that determines a maximum output current, the element of the reference voltage circuit and the element of the overcurrent protection circuit having the same characteristics. Accordingly, there is a correlation between an output voltage before trimming and the maximum output current for overcurrent protection. Thus, a maximum output current before trimming can be estimated without performing evaluation by a test circuit.11-15-2012
20100176777Constant Gm Circuit and Methods - Structures and methods for providing a temperature independent constant current reference are provided. A constant Gm circuit is disclosed with embodiments including a voltage controlled resistor providing a current into a current mirror, the current mirror sinking a reference current at its output. By providing a feedback loop that controls the voltage controlled resistor, a temperature compensated circuit may be obtained. The temperature dependence of the voltage controlled resistor is positive and the feedback circuitry maintains this resistor at a value that compensates for the negative temperature dependence of the current mirror circuit. The reference current is thus obtained at a predetermined level independent of temperature. A method for providing a reference current is disclosed wherein a voltage dependent resistor is provided supply current to a current mirror, the voltage dependent resistor receiving a feedback voltage from the current mirror and the feedback controlling the resistor so that a temperature independent reference current is obtained.07-15-2010
20130009621LOW OFFSET, FAST RESPONSE VOLTAGE CONTROLLED CURRENT SOURCE AND CONTROLLING METHOD THEREOF - The present invention relates to a low offset and fast response voltage controlled current source, controlling method, and a power supply thereof. In one embodiment, a voltage controlled current source can include: a clock signal generator, a first operational amplifier, an input offset eliminator, a sampling and holding circuit, and an output circuit. The input offset eliminator can receive a clock signal, an input voltage, and a feedback voltage, and can (i) store and then eliminate an input offset of the first operation amplifier, and generate an error signal in accordance with an error between the input and feedback voltages when the clock signal is active, and (ii) generate the error signal in accordance with the stored input offset and the error between the input and feedback voltages when the clock signal is inactive.01-10-2013
20130015830Switching Power Supply Having Separate AC And DC Current Sensing PathsAANM Zhang; JindongAACI FremontAAST CAAACO USAAGP Zhang; Jindong Fremont CA US - In a current mode controlled switching power supply, current through the inductor is sensed to determine when to turn off or on the switching transistors. The inductor current has a higher frequency AC component and a lower frequency DC component. The AC current feedback path, sensing the ramping ripple current, is separate from the DC current path, sensing the lower frequency average current. Separating the current sensing paths allows the signal to noise ratio of the AC sense signal to be increased and allows the switching noise to be filtered from the DC sense signal. The gain of the DC sense signal is adjusted so that the DC sense signal has the proper proportion to the AC sense signal. The AC sense signal and the DC sense signal are combined by a summing circuit. The composite sense signal is applied to a PWM comparator to control the duty cycle of the switch.01-17-2013
20130015831VOLTAGE REGULATION IN CHARGE PUMPSAANM WONG; Yanyi L.AACI BellevueAAST WAAACO USAAGP WONG; Yanyi L. Bellevue WA USAANM Sutandi; AgustinusAACI IssaquahAAST WAAACO USAAGP Sutandi; Agustinus Issaquah WA US - Voltage regulation in charge pumps. A high voltage generation system includes a charge pump having an output voltage node and a regulated input voltage node. The high voltage generation system also includes a voltage regulator. The voltage regulator includes a capacitive attenuator in electrical communication with the output voltage node. The voltage regulator also includes a comparator in electrical communication with the capacitive attenuator and with a reference voltage source. The voltage regulator further includes a buffer in electrical communication between the comparator and the regulated input voltage node.01-17-2013
20130015829Synchronization of hysteretic power convertersAANM Menegoli; PaoloAACI San JoseAAST CAAACO USAAGP Menegoli; Paolo San Jose CA USAANM Marino; Fabio AlessioAACI San JoseAAST CAAACO USAAGP Marino; Fabio Alessio San Jose CA US - A novel method to synchronize the switching frequency of hysteretic power converters is presented. The method includes the generation of a clock signal and the injection of a periodic disturbance signal operating at the frequency of the generated clock in the main loop of the converter to synchronize the hysteretic power converter to switch at the frequency of the clock.01-17-2013
20120146604SWITCHING CONTROL CIRCUIT - A switching-control circuit to control a switching operation of a transistor, having an input electrode applied with the input voltage and an output electrode connected to a load via an inductor, to generate an output voltage of a target level from an input voltage, includes: a voltage-generating circuit to generate a slope voltage based on the output voltage in each of a switching period of the transistor, the slope voltage changing with a slope corresponding to the output voltage; an adding circuit to add the slope voltage to a reference voltage, indicating a reference of the output voltage of the target level, or a feedback voltage corresponding to the output voltage; and a drive circuit to perform the switching operation of the transistor, when a level of either one voltage, added with the slope voltage, of the reference and feedback voltages reaches a level of an other voltage thereof.06-14-2012
20130021011DC/DC POWER CONVERSION APPARATUS - A DC/DC power conversion apparatus includes a reactor connected to a DC power supply and a DC voltage conversion section connected to the reactor. The DC voltage conversion section includes a plurality of switching devices, a charge-discharge capacitor which is charged or discharged by ON/OFF operations of the switching devices, a plurality of diodes which provide a charging route and a discharging route for the charge-discharge capacitor. The DC/DC power conversion apparatus also includes a smoothing capacitor on an output side, which is connected to the DC voltage conversion section and including a plurality of voltage division capacitors connected in series to each other, and a switching device for voltage equalization provided on a connection line provided between the negative terminal of the charge-discharge capacitor and a connection point between the voltage division capacitors.01-24-2013
20130021012POWER SUPPLY MODULE - The present application relates to a power supply module which is operable in a switch mode and in a linear mode. The power supply module includes a detector for detecting the presence of an inductor at an output node of the power supply module If an inductor is detected, the detector outputs a signal indicating the presence of the inductor, and the power supply module selects the switch mode as its operating mode. If no inductor is detected, the detector outputs a signal indicative of the absence of an inductor and the power supply module selects its linear mode as its operating mode.01-24-2013
20130021010DIGITAL PULSE WIDTH MODULATION CONTROLLER FOR POWER MANAGEMENT - A digital pulse width modulation (PWM) controller is used for controlling the operating voltage of an electrical load and includes a setting module, a storage module and a control module. The setting module generates control parameters corresponding to different preset load currents and load voltages of the electrical load. The storage module stores the control parameters and the prestored load current and load voltage. The control module is in electronic communication with the storage module, and detects current load voltage and current load current of the electrical load, and compares the current load voltage and load current with the prestored load voltage. Thus, the control module can output the control parameters which are necessary to stabilize the operating voltage of the electrical load, by comparison with stored data.01-24-2013
20120242313SWITCHING REGULATOR, METHOD OF OPERATING THE SWITCHING REGULATOR, AND ELECTRONIC DEVICES HAVING THE SWITCHING REGULATOR - The switching regulator includes a voltage-to-current converter to convert a noise voltage into a noise current and output the noise current; and a sawtooth generator to output a sawtooth voltage signal having a frequency that varies in response to the noise current output from the voltage-to-current converter.09-27-2012
20120242309Autonomous Controlled Headroom Low Dropout Regulator For Single Inductor Multiple Output Power Supply - A controlled headroom low dropout regulator (CHLDO) having an LDO with an input voltage provided by a capacitor. An incremental voltage is added to an output voltage of the LDO to create a reference voltage. The reference voltage is compared to the input voltage to determine when to couple/de-couple the capacitor with a current source. If the capacitor is coupled to the current source, the capacitor will charge only if the voltage driven by the current source exceeds the input voltage provided by the capacitor. When the input voltage developed on the capacitor exceeds the reference voltage, the capacitor is automatically de-coupled from the current source. Multiple CHLDOs can be charged from a single current source, wherein charging automatically proceeds from the lowest voltage CHLDO to the highest voltage CHLDO.09-27-2012
20080224677DEAD TIME TRIMMING IN A CO-PACKAGE DEVICE - A method of obtaining an optimized dead time for a synchronous switching power supply comprising a control IC and two series-connected switches, comprising packaging the control IC and the series-connected switches in a co-packaged module; providing a dead time delay circuit within the control IC circuit which has variable dead time; testing the switching power supply; varying the dead time in a defined sequence during the step of testing; monitoring a parameter during testing of the switching power supply as the dead time is varied; determining an optimal dead time based upon monitoring the parameter; and setting the dead time at the optimal dead time.09-18-2008
20080278130RESONANCE TYPE ELECTRIC POWER CONVERSION APPARATUS AND METHOD - A resonance type electric power conversion apparatus which includes a main circuit including a main reactor, a main switching device, an inverse-parallel diode and an output power diode, and an auxiliary circuit including an auxiliary reactor, an auxiliary switch, and an auxiliary capacitor connected in parallel to the main switching device for forming a recovery current elimination circuit and a partial resonance circuit for discharging charge accumulated in the auxiliary capacitor to turn on the inverse-parallel diode, includes recovery current elimination period calculation means for calculating a recovery current elimination period after the present point of time until the current flowing through the output power diode becomes zero and the charge of the output power diode disappears based on a voltage value across the auxiliary reactor, a current value of the main reactor and an inductance value of the auxiliary reactor, and control means for controlling the auxiliary switching device to turn on based on the recovery current elimination period.11-13-2008
20080231244DC-DC CONVERTER - An overcurrent detection circuit (09-25-2008
20080224676Voltage Clamp Circuit, a Switching Power Supply Device, a Semiconductor Integrated Circuit Device, and a Voltage Level Conversion Circuit - The present invention provides a voltage clamping circuit which is operated in a stable manner with the simple constitution and a switching power source device which enables a high-speed operation. In a switching power source device, one of source/drain routes is connected to an input terminal to which an input voltage is supplied, a predetermined voltage to be restricted is supplied to a gate, and using a MOSFET which provides a current source between another source/drain route and a ground potential of the circuit, a clamp output voltage which corresponds to the input voltage is obtained from another source/drain route. The switching power source device further includes a first switching element which controls a current which is made to flow in an inductor such that the output voltage assumes a predetermined voltage and a second switching element which clamps an reverse electromotive voltage generated in the inductor when the first switching element is turned off to a predetermined potential. In such a switching power source device, the voltage clamping circuit is used in a feedback route for setting a dead time.09-18-2008
20130176010High-Efficiency Base-Driver Circuit For Power Bipolar Junction Transistors - A system or module has a 3-or-more layer current-controlled switching device, such as a bipolar power transistor, for driving a load and a base driver circuit coupled to drive it. The driver has a buck-converter configuration for efficiently driving the switching device. In an embodiment, the driver has an inductor, the inductor having a first terminal coupled to a base of the bipolar junction transistor, a high-side switching device coupled to drive a second terminal of the inductor; and a rectification device coupled to the second terminal of the inductor. The driver also has a control circuit for providing a sequence of pulses through the high-side switching device when a control signal indicates the bipolar junction transistor is to be turned on.07-11-2013
20110273154Semiconductor Device - The present invention provides a non-insulated type DC-DC converter having a circuit in which a power MOS·FET for a high side switch and a power MOS·FET for a low side switch are connected in series. In the non-insulated type DC-DC converter, the power transistor for the high side switch, the power transistor for the low side switch, and driver circuits that drive these are respectively constituted by different semiconductor chips. The three semiconductor chips are accommodated in one package, and the semiconductor chip including the power transistor for the high side switch, and the semiconductor chip including the driver circuits are disposed so as to approach each other.11-10-2011
20110273153ELECTRONIC CIRCUIT ARRANGED TO CONTROL VOLTAGE APPLIED TO A LOAD - The present invention is concerned with an electronic circuit that is connectable to a voltage source and a load. The circuit comprises a controllable load switch element that is arranged so that a supply voltage provided by the voltage source in a connected state is provided to the load when the load switch element is switched on and is not provided to the load when the load switch element is switched off and a voltage detection circuitry that in the connected state is coupled to the load so as to be energized by the voltage applied to the load. The circuit further comprises a switch-on circuitry that is coupled to the load switch element and is arranged to switch on the load switch element for a determined period of time after a switch arranged between the switch-on circuitry and the voltage source is closed. The proposed circuit allows for using a simple voltage detection circuit that is energized by the voltage to be measured by providing the switch-on circuitry.11-10-2011
20110273152OUTPUT VOLTAGE RIPPLE CONTROL FOR A DC-DC POWER CONVERTER - An output ripple voltage average amplitude of a switch mode DC-DC converter is dynamically maintained. The converter has a switch and an output filter. By varying a switching period (T11-10-2011
20120249104VOLTAGE REGULATOR - A voltage regulator permits reduced current consumption by promptly and timely stopping the operation of an inrush current protection circuit immediately after the voltage regulator is started up. The voltage regulator has an output voltage detection circuit, which issues a detection signal to actuate the inrush current protection circuit when a low voltage at an output terminal is detected at the time of starting up the voltage regulator. When it is detected that the voltage at the output terminal has reached a predetermined level, the operation of the inrush current protection circuit is stopped and a power path of the output voltage detection circuit is cut off.10-04-2012
20120249102Hybrid-switching Step-down Converter with a Hybrid Transformer - The present invention employs a resonant inductor, a resonant capacitor and a hybrid transformer using a Hybrid-switching method with three switches which results in two distinct switched-networks: one for ON-time interval and another for OFF-time interval. Resonant inductor is placed in series with the hybrid transformer primary to insure the continuity of primary and secondary currents at the switching transitions. The hybrid transformer converts both inductive and capacitive energy storage from the source to the load. The two-phase extension results in tenfold reduction of the output current ripple.10-04-2012
20090218999DC converter which has switching control unit to select PWM signal or PFM signal - A DC (direct current) converter includes a PWM (pulse width modulation) pulse generation unit outputting a PWM pulse signal whose duty ratio is controlled in accordance with an output voltage, a PFM (pulse frequency modulation) pulse generation unit outputting a PFM pulse signal whose pulse output interval is controlled in accordance with an output voltage, a selection circuit selecting and outputting any one of the PWM pulse signal and the PFM pulse signal in response to a selection signal, a drive circuit unit driving a load and generating an output voltage on the basis of a signal outputted from the selection circuit, and a switching control unit outputting the selection signal. When the selection signal is in a second state, the switching control unit detects a fact that the number of pulses of the PFM pulse signal in a measurement period increases to or above a set value of the maximum number of pulses, and switches the selection signal to a first state.09-03-2009
20130134954CONSTANT VOLTAGE CIRCUIT - In a constant voltage circuit including: an error amplifier circuit amplifying a difference voltage between an output voltage and a reference voltage; and an output transistor controlling the output voltage based on an output of the error amplifier circuit, a voltage proportional to a leakage current detected by a monitoring transistor is generated by an oscillation circuit and a charge pump circuit and is supplied to a back gate of the output transistor.05-30-2013
20130134953SPREAD SPECTRUM POWER CONVERTER - A power converter includes a first stage voltage modulator configured to receive an input voltage and provide a modulated voltage. A second stage power converter is configured to receive the modulated voltage and vary a switching frequency of the second stage power converter in accordance with the modulated voltage to provide an output voltage.05-30-2013
20130113448COIL INDUCTOR FOR ON-CHIP OR ON-CHIP STACK - A coil inductor and buck voltage regulator incorporating the coil inductor are provided which can be fabricated on a microelectronic element such as a semiconductor chip, or on an interconnection element such as a semiconductor, glass or ceramic interposer element. When energized, the coil inductor has magnetic flux extending in a direction parallel to first and second opposed surfaces of the microelectronic or interconnection element, and whose peak magnetic flux is disposed between the first and second surfaces. In one example, the coil inductor can be formed by first conductive lines extending along the first surface of the microelectronic or interconnection element, second conductive lines extending along the second surface of the microelectronic or interconnection element, and a plurality of conductive vias, e.g., through silicon vias, extending in direction of a thickness of the microelectronic or interconnection element. A method of making the coil inductor is also provided.05-09-2013
20130093405BUCK CONVERTER - A buck converter comprising a controller arranged to monitor an output voltage of the converter, the controller comprising: a comparator arranged to compare an output voltage at an output of the buck converter with a reference voltage, and a modification circuit within the comparator or connected to a modification signal input of the comparator and arranged to produce a correction signal to modify the operation of the comparator; and an output.04-18-2013
20130099765MODULAR BATTERY DISCONNECT UNIT - A system according to the principles of the present disclosure includes a battery disconnect unit (BDU) and a cartridge. The BDU includes a first positive terminal, a first negative terminal, a second positive terminal, a second negative terminal, a first current path, a second current path, a first switch, and a second switch. The first current path is between the first positive terminal and the second positive terminal. The second current path is between the first negative terminal and the second negative terminal. The first switch is disposed in the first current path. The second switch is disposed in the second current path. The cartridge includes a first terminal, a second terminal, and a current path between the first terminal and the second terminal. The first terminal is configured to connect to one of the terminals on the BDU.04-25-2013
20130119955High Voltage SEPIC Converter - A SEPIC converter with over-voltage protection includes a high-side inductor that connects a node V05-16-2013
20130187624SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE AND DC-DC CONVERTER - According to one embodiment, a semiconductor integrated circuit device for a DC-DC converter is configured to convert an input voltage to an output voltage by controlling a voltage supplied to a load according to a Pulse Width Modulation (PWM) signal, and to output the output voltage from an output terminal. The device includes an error voltage generator, a phase compensating module, a controller, and an error voltage adjuster. The error voltage generator is configured to generate an error voltage indicative of a difference between a feedback voltage corresponding to the output voltage and a predetermined reference voltage. The controller is configured to generate the PWM signal whose duty ratio depends on the error voltage and on a current flowing through the load connected to the output terminal. The error voltage adjuster is configured to adjust the error voltage based on a gradient of the feedback voltage.07-25-2013
20130127432SWITCHING POWER SUPPLY DEVICE - An object of the present invention is to achieve the reduction of EMI, the improvement of conversion efficiency, and simplification of the input filter. Provided is a switching power supply device that comprises: a chopper circuit that turns on/off the passage of a current to an inductor by means of a switching element; and a switching control circuit that switches the switching element so that an input voltage and an input current have the same phase and a similar shape. The switching control circuit is configured to switch the switching element at a switching frequency that is proportional to an input voltage dependent term of a formula that expresses a third harmonic component of ripples of the current flowing to the inductor.05-23-2013
20130127430Power Regulator for Driving Pulse Width Modulator - A voltage regulator that modulates the switching of a switching circuit to regulate the output voltage level supplied to a system. The regulator uses a comparator circuit to compare a reference signal to an analog signal derived from the output voltage of the regulator, and outputs a binary signal based on the comparison. The regulator may use a counter circuit that interrogates the binary signal from the comparator circuit and generates a counter signal proportional to, for example, the duration of the binary signal when it stays in one of the two binary states. The regulator then uses a trigger circuit that generates a signal based on the counter signal to effectuate the modulation of the switching of the switching circuit. The reference signal may be modified by a hysteresis level adjuster to force a triggering event at the switching circuit.05-23-2013
20130127429Soft-stop Device and Power Converter Using the Same - A soft-stop device for a power converter includes a first signal terminal for receiving a first signal corresponding to an output voltage of the power converter; a second signal terminal for receiving a shutdown signal for turning off the power converter; a discharge switch, coupled between the first signal terminal and a grounding terminal, for controlling an electrical connection between the first signal terminal and the grounding terminal according to a control signal; a sample-and-hold unit, for sampling the first signal received by the first signal terminal when the shutdown signal is received by the second signal terminal, to generate a shutdown reference voltage; and a shutdown control unit, for generating the control signal according to the first signal and the shutdown reference voltage.05-23-2013
20130141067MAXIMUM POWER POINT TRACKING CONTROLLERS AND MAXIMUM POWER POINT TRACKING METHODS - A maximum power point tracking controller, suitable for controlling an output voltage of a power converter is provided, including a slope detection unit and a control unit. The slope detection unit calculates whether the output voltage is in a positive trend or in a negative trend according to a detection signal corresponding to the output voltage in order to output a trend signal, in which the voltage level of the trend signal is a first voltage level or second voltage level when the output voltage is in the positive trend or negative trend. The control unit has first and second operation modes to respectively increase and decrease a duty cycle of a PWM signal, in which the control unit switches current operation mode to perform a maximum power point tracking procedure when the trend signal is changed from the first voltage level to the second voltage level.06-06-2013
20130141068AVERAGE POWER TRACKING CONTROLLER - This disclosure relates to radio frequency (RF) power converters and methods of operating the same. In one embodiment, an RF power converter includes an RF switching converter, a low-drop out (LDO) regulation circuit, and an RF filter. The RF filter is coupled to receive a pulsed output voltage from the RF switching converter and a supply voltage from the LDO regulation circuit. The RF filter is operable to alternate between a first RF filter topology and a second RF filter topology. In the first RF filter topology, the RF filter is configured to convert the pulsed output voltage from a switching circuit into the supply voltage. The RF filter in the second RF filter topology is configured to filter the supply voltage from the LDO regulation circuit to reduce a ripple variation in a supply voltage level of the supply voltage. As such, the RF filter provides greater versatility.06-06-2013
20110210710STEP-UP DC-DC CONVERTER AND SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE - A semiconductor integrated circuit device includes: a semiconductor switching element; an input voltage detection circuit that outputs a voltage correlated to an input voltage; an oscillator circuit that oscillates on the basis of the voltage outputted by the input voltage detection circuit; a control logic that generates a drive signal; a power supply circuit that boosts a battery voltage; a buffer that level-shifts the drive voltage outputted by the control logic; and an amplification element that operates using a voltage generated by the semiconductor switching element as a power supply. Thus, the semiconductor switching element can be on/off controlled so that switching loss at low load can be reduced while preventing the peak current flowing into the inductor coil from depending on the input voltage.09-01-2011
20080197828Switching regulator - A switching regulator includes a switching transistor to switch in accordance with an input control signal, an inductor charged with an input voltage in response to a switching operation by the switching transistor, a switch signal generator to detect an inductor current flowing through the inductor from a voltage at a connection point between the switching transistor and the inductor and output a predetermined switch signal after a time in accordance with the input voltage when detecting the inductor current is zero, and a controller to perform a PWM control or a PFM control on the switching transistor in accordance with the switch signal output from the switch signal generator to keep an output voltage output from the output terminal at a predetermined constant voltage. The controller performs the PFM control when the predetermined switch signal is continuously input thereto from the switch signal generator one or more times.08-21-2008
20080197827Reverse Current Comparator Circuit and Method for Switching Regulators - A reverse current comparator for use in switching regulators includes a differential stage configured to encode the difference in voltage between an N and a P input. The differential stage feeds one or more gain stages. At least one of the gain stages includes one or more hysteresis devices. When the voltage of the N input exceeds the voltage of the P input by a predetermined margin, the hysteresis device causes the regulator to enter a triggered state in which it outputs a non-zero output voltage. Subsequent changes to the N and P inputs do not change the regulator output until a RESET input is asserted and which point the regulator enters a reset state and is ready to be triggered.08-21-2008
20080197826SWITCHING POWER SUPPLY CONTROLLER WITH TRANSIENT GAIN CHANGE - A switching power supply controller has a nominal loop gain and transient loop gain that is only activated in response to an abrupt load change in one direction. The transient loop gain may be implemented with a series-connected diode and resistor combination arranged in a feedback configuration with an error amplifier. A large load change in one direction may swing the output of the error amplifier and forward bias the diode to create a non-linear gain change.08-21-2008
20110227547Sensing capacitor for constant on-time and constant off-time switching regulators - A method includes generating an output voltage using a constant on-time or constant off-time (COT) switching regulator. The switching regulator includes a switch and an output capacitor. The method also includes sensing a first current flowing through a sensing capacitor, where the first current is proportional to a second current flowing through the output capacitor. The method further includes controlling the switch based on the sensed first current. Controlling the switch could include generating a feedback voltage using the sensed first current, combining the feedback and output voltages to generate a combined voltage, comparing a scaled version of the combined voltage and a reference voltage, and triggering a one-shot timer based on the comparison. A capacitance of the output capacitor may be greater than a capacitance of the sensing capacitor by a factor of N, and a transimpedance amplifier having a gain based on N could generate the feedback voltage.09-22-2011
20130147451DEAD TIME MODULATION TECHNIQUE FOR THE IMPROVEMENT OF POWER CONVERSION EFFICIENCY - A method for generating an output voltage from an input voltage with a switched mode power supply at a switching frequency is provided. At the switching frequency, a transistor within a switching circuit is deactivated so as to enter into a dead time interval, where the switching circuit includes a switching node. A negative inductor current is used during the dead time interval so as to slew the switching node, where switching frequency and the input voltage are sufficiently large so as to overcome a loss incurred by using the negative inductor current.06-13-2013
20130147452SWITCHING CURRENT SYNTHESIS CIRCUIT FOR POWER CONVERTER - A control circuit of a power converter is provided. The control circuit comprises a PWM circuit, a sample circuit, and emulation circuit. The PWM circuit generates a switching signal for switching an inductor and generating a switching current of the inductor in response to a current feedback signal. The sample circuit is coupled to sample a switching current signal into a capacitor during an on time of the switching signal. The emulation circuit generates a discharge current couple to discharge the capacitor during an off time of the switching signal for generating the current feedback signal. The switching current signal is correlated to the switching current of the inductor, and the discharge current is generated in response to an input voltage of the inductor, an output voltage of the power converter, and the on time of the switching signal.06-13-2013
20130147453Current Control Semiconductor Element and Control Device Using the Same - This invention provides a current control semiconductor element that can detect a current with high accuracy in a single IC chip by dynamically correcting changes in a gain a and an offset b, and a control device that uses the current control semiconductor element.06-13-2013
20130147449BI-POLAR BI-DIRECTIONAL ENERGY BALANCING POWER-CONVERSION ENGINE - The invention provides a power converter and method for controlling same, comprising a plurality of switch elements, an inductive reactor, and at least two ports for the movement of electrical energy. Any energy-moving port may be made unipolar, bidirectional, bipolar, or bidirectionally bipolar. Ports may be equipped with sensing circuitry to allow the converter output to be controlled responsively to an input signal. The invention may be configured to be used in many ways, for example, as a power-supply, as an amplifier, or as a frequency converter. The invention may comprise energy predictive calculating means to obtain excellent transient response to line and load variations. The invention may also include a switch to create a low impedance path around the inductor to allow current to recirculate through the inductor when it is not needed at any of the ports.06-13-2013
20130147450Predictable Method for Reducing Power Consumption during Peak Demand - System and method for reducing power consumption during peak demand period is disclosed. A consumption unit comprises a power limiter. An AC power limiter converts a portion of AC power into heat and generates an output for a temperature sensor. A comparator has one of the inputs as the output of the temperature sensor and another input as a reference generated by a controller. A feedback loop is established by connecting output of the comparator to secondary winding of a power transformer through a switch. A DC power limiter is also disclosed.06-13-2013
20080309302DC-DC CONVERTER - The invention discloses DC-DC converters comprising an inductance, a pulse width modulator generating a pulse signal according to the voltage level of a transformed voltage output terminal, a load sensor sensing a load current, an adaptive enable signal generator generating a PMOS transistor enable signal and an NMOS transistor enable signal based on the pulse signal and the load current, and a power transistor set comprising at least one PMOS transistor and an NMOS transistor. The power transistor set is used in coupling the transformed voltage output terminal to an original DC voltage source or ground via the inductance. The conductance of the PMOS and NMOS transistors are controlled by the PMOS and NMOS transistor enable signals, respectively. The adaptive enable signal generator makes a first dead-time between the PMOS and NMOS transistor enable signals decreasing with increasing load current.12-18-2008
20100308785ELECTRONIC DEVICE AND METHOD FOR DC-DC CONVERSION - An electronic device is provided for switched DC-DC conversion of an input voltage level into an output voltage level. The electronic device is configured to control a control gate of a power switch and to prevent a charge of a capacitance of the control gate released during a switching operation from flowing to ground.12-09-2010
20100308784ELECTRONIC DEVICE AND METHOD FOR DC-DC CONVERSION WITH VARIABLE BIAS CURRENT - The invention relates to an electronic device and a method for DC-DC conversion using a comparator for generating an output signal for driving a power switch of a switch mode DC-DC converter. The electronic device is configured to reduce a bias current of the comparator with a first slope in response to a decreasing load and to increase the bias current of the comparator with a second slope in response to an increasing load, wherein the second slope is steeper than the first slope.12-09-2010
20100308783FAST BOOST REGULATOR - A boost regulator that comprises a capacitor adapted to couple in parallel with a load, a switch coupled to the capacitor and to a diode, a comparator coupled to the load and receiving a reference voltage, and a circuit logic component that receives an output of the comparator and an output of a duty cycle signal generator. An output of the circuit logic component couples to the switch and is capable of activating and de-activating the switch.12-09-2010
20100308782CONTROLLER FOR A BUCK-BOOST CIRCUIT - A control circuit includes a controller that provides a master PWM signal indicative of a difference between a predetermined setpoint and a process signal. The control circuit also includes a PWM splitter circuit that receives the master PWM signal and provides a first PWM signal for a first switch and a second PWM signal for a second switch. The first PWM signal corresponds to a first portion of the master PWM signal and the second PWM signal corresponds to a second portion of the master PWM signal.12-09-2010
20120274298POWER FACTOR CORRECTION CONVERTER CONTROL OFFSET - A power supply arrangement includes a PFC converter, an LLC converter, a control unit and an offset unit. The control unit generates a control signal to control a duty cycle of a PWM (Pulse Width Modulation) signal to control the PFC converter. The control unit includes a PWM converter that generates the PWM signal to which a switching circuit is responsive to switch a current representing an input current of the PFC converter. An amplifier receives a current sense signal and provides the current representing the input current of the PFC converter. An offset unit generates a variable offset signal to offset the control signal or a signal used by the control unit to generate the control signal. The variable offset signal is an offset current coupled to offset the current sense signal received at the input of the amplifier.11-01-2012
20120274296SWITCHED-MODE POWER SUPPLY - Provided is a switched-mode power supply. The power supply includes: a DC voltage input terminal; a driver switching element connected to the input terminal; an inductor connected to the driver switching element; an output terminal connected to the inductor and outputting output voltage different from the input voltage; and an integrated circuit outputting control pulses used for on-off control of the driver switching element. The integrated circuit has: a ripple injection circuit adding a ripple component to a feedback voltage of the output voltage; a voltage comparator comparing the summed voltage with a predetermined voltage; and a control pulse generator generating the control pulse based on an output of the voltage comparator. The ripple injection circuit has an integrator outputting an integral of the voltage at the node between the driver switching element and the inductor, and a series RC circuit connected to the output end of the integrator.11-01-2012
20120274295CURRENT MODE BUCK-BOOST CONVERTER - A current mode buck-boost converter has an input terminal, an output terminal, and an output capacitor coupled to the output terminal. The input terminal is used to receive an input voltage, and the output terminal is for producing the output voltage. The current mode buck-boost converter comprises a voltage converter and a control circuit. The voltage converter comprises an inductor. The control circuit is for detecting the current passing through the inductor to determine the electric energy transmitted to the output terminal by the voltage converter. Accordingly, the current mode buck-boost converter has fast response, and the electrical energy can be recycled and stored to the voltage source when the current mode buck-boost converter operates in down-tracking process.11-01-2012
20120274294CONTROLLER FOR CONVERTING CIRCUIT - A control circuit adapted to a DC-DC converting circuit is disclosed. The controller comprises a reference voltage generator, a reference voltage adjusting circuit, a feedback circuit and a driving circuit. The reference voltage adjusting circuit generates an adjusted reference voltage according to a reference voltage generated by the reference voltage generator. The feedback circuit generates a feedback control signal according to the adjusted reference voltage and the feedback signal. The driving circuit generates at least one control signal for controlling the converting circuit according to the feedback control signal.11-01-2012
20110234189CURRENT CONTROL DEVICE FOR ELECTRIC LOAD - Initial calibration is performed only under normal-temperature environment, and accurate current control is performed under practical use temperature environment. A temperature sensor 09-29-2011
20110234188Buck Converter with Internal Ripple Compensation - A buck converter with internal ripple compensation includes a comparator for generating a comparison result, a constant-on-time trigger coupled to the comparator for generating a trigger control signal according to the comparison result, a pre-driver coupled to the constant-on-time trigger for controlling a high side switch and a low side switch, an output module coupled to a first node and a signal output end, and a ripple compensation circuit coupled to the high side switch, the low side switch, the first node, and the comparator for generating a compensation signal outputted to the comparator.09-29-2011
20110234187Voltage Regulator Bypass Resistance Control - Embodiments for at least one method and apparatus of controlling a bypass resistance of a voltage regulator are disclosed. One method includes generating a regulated output voltage based upon a switching voltage. The switching voltage is generated through controlled closing and opening of a series switch element and a shunt switch element, the series switch element and the shunt switch element being connected between voltages based on an input voltage. A control of a duty cycle of the switching voltage is provided by sensing and feeding back the regulated output voltage. The bypass resistance is controlled based on a parameter related to the duty cycle, wherein the control of the duty cycle is persistent during the control of the bypass resistance.09-29-2011
20100315052METHOD OF SWITCHING A PWM MULTI-PHASE VOLTAGE CONVERTER - A circuit may generate a clock signal with a variable period given by a ratio between an initial switching period and a number of phase circuits through which a current of a multi-phase PWM voltage converter flows. The circuit may include an adjustable current generator driven by a signal representing the number of phase circuits through which the current flows and configured to generate a current proportional to the number of phase circuits through which the current flows, and a tank capacitor charged by the adjustable current generator. The circuit may include a comparator of a voltage on the tank capacitor with a threshold value configured to generate a pulse of the clock signal when the threshold value is attained, and a discharge path of the tank capacitor, the discharge path being enabled during the pulses of the clock signal.12-16-2010
20100315051WAY OUT OF BALANCE (WOB) CURRENT CORRECTION FOR USE WITH A MULTI-PHASE DC-DC CONVERTER - Provided herein are circuits, systems and methods that monitor for way out of balance (WOB) conditions within a multi-phase DC-DC converter, and adjust a balance between currents through channels of the DC-DC converter, in dependence on detected WOB conditions.12-16-2010
20100315050NOVEL REGULATION SCHEME FOR A CHARGE PUMP - A boost regulator system for regulating one or more output voltages includes, a first pump element coupled to receive a first input voltage, a first switching device coupled to the first pump element, the first switching device causing a finite amount of energy to be stored in the first pump element in response to a first control signal. The system further includes, a first capacitor coupled to the first pump element and the first switching device, the first capacitor storing the finite amount of energy and generating a first output voltage in response to the finite amount of energy. A boost controller (BC) coupled to receive the first output voltage, the boost controller further configured to regulate the first output voltage by generating the first control signal.12-16-2010
20130154594ELECTRONIC DEVICE AND METHOD FOR POWER MEASUREMENT - The invention relates to an electronic device comprising a switched mode power converter comprising a switched transistor, an inductor and an error amplifier. The switched transistor is configured to switch a current through the inductor. The error amplifier is configured to control the switching of the switched transistor to convert a primary voltage applied at the input into a secondary voltage at the output of the switched mode power converter. The electronic device further comprises an oscillator, a control logic stage and a digital counter. The control logic stage is coupled to receive a clock signal from the oscillator and to generate switching signals for the switched transistor in form of ON-time pulses with a constant ON-time according to a pulse density scheme. The counter is configured to count the number of ON-time pulses for determining the consumed power based on the number of ON-time pulses per time.06-20-2013
20130154595VOLTAGE-TO-CURRENT SENSING CIRCUIT AND RELATED DC-DC CONVERTER - The present disclosure is directed to a voltage-to-current sensing circuit having a bias terminal configured to receive a reference voltage, an offset terminal configured to receive an offset current, and an operational amplifier configured to output a low voltage signal. The device includes a first amplifier having first and second high voltage inputs configured to receive a first voltage difference across a sense component on a high voltage line and to generate a first current, a second amplifier having first and second low voltage inputs configured to receive a second voltage difference between the bias terminal and the offset terminal and to generate a second current, a summing circuit configured to provide an intermediate voltage corresponding to a sum of the first and the second currents, and a low-voltage transistor coupled to an output of the amplifier and controlled by the intermediate voltage to generate the output current.06-20-2013
20130154596SWITCHING POWER SUPPLY - A switching power supply includes an input terminal, a voltage converter, a feedback circuit, and a pulse width modulation (PWM) controller. The input terminal receives a first direct current (DC) voltage. The voltage converter transforms the first DC voltage into a second DC voltage and provides the second DC voltage to a load via transmission lines. The feedback circuit is configured for detecting voltage lost across the transmission lines. The PWM controller controls the voltage converter to adjust the second DC voltage according to the voltage loss.06-20-2013
20110285371Device for the distribution of firing pulses, circuit arrangement for the sequence control of power regulators with such a device for the distribution of firing pulses and procedure for sequence control of power regulators for realization with such a circuit arrangement - This invention relates to a device (11-24-2011
20110298436Control circuit of switching regulator and control method thereof and transistor device therefor - The present invention discloses a control circuit of a switching regulator wherein a confirmation signal is generated to confirm that an upper gate switch has been turned off, to avoid shoot-through. The confirmation signal is generated by obtaining an upper gate sampling signal from a transistor in a level shift circuit which receives a resetting signal for turning off the upper gate switch.12-08-2011
20110309811REGULATOR APPARATUS - A regulator apparatus having an input terminal and an output terminal, the regulator apparatus includes: a plurality of regulators arranged in parallel between the input terminal and the output terminal; an conversion efficiency characteristic information obtaining unit that obtains conversion efficiency characteristic information representing a characteristic of a conversion efficiency with respect to an output current with regard to each of the plurality of regulators; a memory that stores the conversion efficiency characteristic information of each of the plurality of regulators obtained by the conversion efficiency characteristic information obtaining unit; and a switching control unit that performs a switching control on the plurality of regulators based on a value of the output current output from the output terminal and the conversion efficiency characteristic information stored in the memory.12-22-2011
20110309810Electronic Circuit and Semiconductor Arrangement With a Load, a Sense and a Start-Up Transistor - Disclosed is an electronic circuit with a first load terminal, a second load terminal, a supply terminal configured for having a charge storage arrangement connected thereto, and a load transistor, a current sense circuit with a sense transistor, and a start-up circuit with a start-up transistor.12-22-2011
20110309809HIGH POWER DC SSPC WITH CAPABILITY OF SOFT TURN-ON TO LARGE CAPACITIVE LOADS - Pre-charge circuitry allows capacitive loads connected to a solid state power controller to be gradually charged up by a PWM, generated with a cycle by cycle current limit, switching a single MOSFET in series with an inductor, before the SSPC is turned on. The pre-charge circuitry may require only three additional components, e.g., a MOSFET, an inductor and a diode, along with a designated MOSFET gate driver.12-22-2011
20110309808BIAS-STARVING CIRCUIT WITH PRECISION MONITORING LOOP FOR VOLTAGE REGULATORS WITH ENHANCED STABILITY - A regulator circuit includes a voltage regulator having a stability control input and an output for providing a regulated output voltage, an amplifier circuit having an input for receiving an error voltage of the voltage regulator, and an output, and a control circuit having an input coupled to the output of the amplifier and an output coupled to the stability control input of the voltage regulator, such that the regulator stability is maximized while the error voltage is minimized. The voltage regulator includes an LDO voltage regulator, the amplifier circuit includes an operational amplifier circuit, and the control circuit includes a load-sensing or load-replicating circuit.12-22-2011
20110316510LOAD DRIVE DEVICE - A load drive device capable of expanding a range of an output power by improving a linearity thereof when the output power varies. This device includes an output circuit 12-29-2011
20120001608INTELLIGENT GATE DRIVE - According to an embodiment of the invention, an apparatus includes a microprocessor-based pulse-width modulation controller configured to generate a pulse-width modulation signal, and a synchronous converter including a first transistor, a second transistor, a first driver, and a second driver. The apparatus further includes a drive voltage generator configured to generate a drive voltage for the synchronous converter. The drive voltage generator is further configured to generate the drive voltage based on a measured output current and a measured input voltage.01-05-2012
20120013321SYSTEMS AND METHODS OF PRIMARY-SIDE SENSING AND REGULATION FOR FLYBACK POWER CONVERTER WITH HIGH STABILITY - System and method for regulating an output voltage of a power conversion system. The system includes an error amplifier coupled to a capacitor. The error amplifier is configured to receive a reference voltage, a first voltage, and an adjustment current and to generate a compensation voltage with the capacitor. The first voltage is associated with a feedback voltage. Additionally, the system includes a current generator configured to receive the compensation voltage and generate the adjustment current and a first current, and a signal generator configured to receive the first current and a second current. The signal generator is further configured to receive a sensing voltage and to generate a modulation signal. Moreover, the system includes the gate driver directly or indirectly coupled to the signal generator and configured to generate a drive signal based on at least information associated with the modulation signal.01-19-2012
20120019224DC-DC Converter - A dual-mode switching voltage regulator has a duty cycle that varies with the input and output voltages so as to dynamically compensate for changes in the operating conditions. The switching voltage regulator uses input and output voltages/currents to optimize the duty cycle of the signals applied to a pair of switches disposed in the regulator. In the PFM mode, a control block senses the time that a first switch used to discharge an inductor is turned off. If the control block senses that the first switch is opened too early, the control block increases the on-time of a second switch used to charge the inductor. If the control block senses that the first switch is opened too late, the control block decreases the on-time of the second switch.01-26-2012
20120019223MINIATURE HIGH-VOLTAGE POWER SUPPLIES - The present invention provides miniature power supplies and circuitry for powering high-voltage devices.01-26-2012
20120019222Photoelectric Transducer Device - An object is to obtain a rectifier having a small voltage drop and to reduce the fabrication cost of a converter circuit. A photoelectric transducer device including: a photoelectric transducer element; and a converter circuit stepping up or stepping down an output of the photoelectric transducer element and including a switching element and a rectifier, in which the switching element is a first oxide semiconductor transistor that is normally off and in which the rectifier is a second oxide semiconductor transistor that is diode-connected and normally on.01-26-2012
20130193941Bypass Control in a DC-to-DC Converter - The present document relates to switched power supplies. In particular, the present document relates to a method and system for controlling a bypass transistor in a DC-to-DC converter. A power converter configured to convert an input voltage at an input of the power converter into an output voltage at an output of the power converter is described. The power converter comprises a DC-to-DC converter comprising a high side switch; a bypass transistor parallel to the DC-to-DC converter, configured to couple a load at the output of the power converter to the input voltage during an on-state of the bypass transistor; and current sensing means configured to sense a current through the high side switch; wherein the bypass transistor is controlled based at least on the sensed current through the high side switch.08-01-2013
20130193940METHOD OF FORMING A SWITCHED MODE POWER SUPPLY CONTROLLER DEVICE WITH AN OFF MODE AND STRUCTURE THEREFOR - At least one embodiment is directed to a semiconductor voltage controller comprising: a start-mode circuit associated with a start-mode; and an off-mode circuit associated with an off-mode, where the voltage controller can be configured to receive a feedback signal and an off-mode signal from a single input and provide an output voltage, where the voltage controller can be configured to be in the off-mode when the feedback signal is less than a skip level and the feedback signal is less than a HV control level, and where the voltage controller can be configured to be in start mode when the feedback signal is greater than HV control level and Vcc is below a Vcc-start.08-01-2013
20130193942CURRENT DRIVER CIRCUIT - A current driver circuit includes a converter part having a switching element and converting an input voltage into an output voltage; a current detector which generates a detection signal indicative of the current of the switching element; an input voltage compensating circuit which generates a compensation signal corresponding to the input voltage; a comparator which compares the detection signal and the compensation signal against each other; and a switch driver circuit which generates a drive signal. The drive signal turns the switching element off in accordance with an output of the comparator, and turns the switching element on again after a lapse of a prescribed time from the switching element being turned off.08-01-2013
20120038337METHOD AND APPARATUS FOR CONTROLLING THE OPERATION OF A SNUBBER CIRCUIT - An apparatus for controlling operation of a snubber circuit in a system in which an input voltage is processed using at least switches controlled with at least one periodical pattern. The input voltage is applied to the snubber circuit when the operation of the snubber circuit is enabled. The apparatus includes: a mechanism determining a periodical pattern to be used for controlling the switches, the periodical pattern modifying the input voltage; a mechanism disabling the operation of the snubber circuit; a mechanism controlling the switches with the determined periodical pattern; a mechanism checking if the input voltage is compatible with a given value; and a mechanism enabling the operation of the snubber circuit when the input voltage is compatible with the given value.02-16-2012
20130200867HIGH SIDE DRIVER CIRCUITRY - One embodiment of the present disclosure provides a method for controlling a power switch that includes converting a control signal to a current pulse signal, where the control signal is referenced to a first reference potential. The method also includes generating a switch drive voltage signal based on the current pulse signal, where the switch drive signal is referenced to a second reference potential. The method also includes controlling the conduction state of a power switch using the switch drive voltage.08-08-2013
20130200868Protection of an N-Channel Transistor - The present document relates to power converters. In particular, the present document relates to a scheme for operating a low side switch of a power converter in the safe operation area. A power converter converting an input voltage to an output voltage is described. The power converter comprises a low side switch configured to couple an inductor to ground during an on-state of the low side switch; wherein the inductor is configured to store energy to be provided to a load at the output of the power converter; and a protection switch in parallel to the low side switch, configured to reduce a voltage drop across the low side switch during at least part of a switch off time of the low side switch.08-08-2013
20130200869DC/DC Converter - Based upon a detection voltage V08-08-2013
20120062198REGULATOR AND DC/DC CONVERTER - A regulator and a DC/DC converter are provided in which a soft start is carried out even when an output is short-circuited by abnormality. Regulator includes soft start circuit that gradually starts up a reference voltage that is input into error amplifier from 0 V to the reference voltage and soft start reset circuit that monitors an input of error amplifier and performs soft start of soft start circuit again when an output of output terminal Vo is short-circuited. Soft start reset circuit includes comparator that is disposed in parallel with an input of error amplifier, offset voltage that gives an offset to the input of comparator, and NPN transistor that is turned on or off in accordance with a result of comparison of comparator and discharges capacitor C by being turned on when the output is short-circuited.03-15-2012
20120062193VOLTAGE REGULATION CIRCUIT - A voltage regulation circuit including a differential input unit, a source follower and a driving unit is provided. The differential input unit has a first input terminal and a second input terminal for receiving a reference voltage and a system voltage respectively. Further, the differential input unit compares the reference voltage and the system voltage and accordingly generates a control voltage. The source follower is electrically connected between the differential input unit and the driving unit, and generates an adjustment voltage according to the control voltage. The differential input unit, the source follower and the driving unit form a feedback loop, so that the driving unit fixes a source voltage to the system voltage according to the adjustment voltage.03-15-2012
20120299565Constant On-Time Switching Regulator Implementing Dual Control Loops - A control circuit for a switching regulator implements constant on-time control scheme with synchronous rectification and applies dual control loops to improve light load efficiency and enhance transient response. In one embodiment, the control circuit includes a first control loop configured to control a one-shot timer to generate a control signal to turn on the main switch when the feedback voltage is below a first reference voltage and a minimum off-time duration has expired. The control circuit further includes a second control loop configured to control the one-shot timer to generate the control signal to turn on the main switch when the feedback voltage is below a second reference voltage and the minimum off-time duration has expired and a low-side current signal has a first state indicative of a light load condition at the output node.11-29-2012
20120086420Capless Regulator Overshoot and Undershoot Regulation Circuit - Systems and methods for reducing voltage undershoot and overshoot of a voltage regulator are disclosed. In one embodiment of the present disclosure, an undershoot/overshoot regulation circuit comprises a control node having a control voltage. The regulation circuit also comprises a control circuit configured to increase the control voltage in response to a load being applied to an output node of a voltage regulator and decrease the control voltage in response to the load being removed from the output node. The regulation circuit also comprises a control capacitor including a first terminal coupled to the control node and a second terminal coupled to a gate node of the voltage regulator. The control capacitor is configured to increase a gate voltage at the gate node in response to the increase of the control voltage, and decrease the gate voltage in response to the decrease of the control voltage.04-12-2012
20130207629NEGATIVE SLOPE COMPENSATION FOR CURRENT MODE SWITCHING POWER SUPPLY - Generated are an error signal representative of a difference between a signal representative of the output voltage of a current mode switching power supply and a reference voltage, and a peak current threshold signal that is indicative of a peak current that should be reached in an inductor within the power supply during each cycle of a periodic clock signal and that has a level that is based on the error signal. A switch control signal regulates the voltage output of the power supply by closing and then opening a power switch during each cycle of the periodic clock signal. Timing of opening is based on the peak current threshold signal. Negative slope compensation causes the switch control circuit to delay opening the power switch during each cycle of the periodic clock signal in an amount that decreases with increasing duty cycles of the switch control signal.08-15-2013