Entries |
Document | Title | Date |
20080219031 | Apparatus and methods for improving the transient response capability of a switching power supply - The transient response of a switching power supply is improved by providing one or more supplemental power sources connected to the output terminal of the power supply. In one embodiment additional current is provided when a sudden increase in load current causes a corresponding decrease in output voltage. In one embodiment current is discharged when a sudden decrease in load current causes a corresponding increase in output voltage. The supplemental power sources provide a fixed current for a fixed duration. In one embodiment the current provided from the power sources is variable according to the increase or decrease in load current. In some embodiments the supplemental current is provided for a time period approximating the time required for the switching power converter coil current to equal the new load current. | 09-11-2008 |
20080219032 | METHOD AND SYSTEM FOR OPERATING A POWER CONVERTER - A method and system for operating a power converter having an electrical component and a switch coupled to a voltage source are provided. A signal is received that is representative of a desired current flow through the electrical component. A signal is generated that is representative of a difference between the desired current flow and an actual current flow through the electrical component. A duty cycle for the switch is calculated based on the signal representative of the difference and a voltage generated by the voltage source. | 09-11-2008 |
20080225557 | HIGH VOLTAGE POWER SUPPLY - Provided is a high voltage power supply which includes a controller to provide a PWM signal and a power signal, an input unit to receive the PWM signal provided from the controller, a comparison unit to control output of the power signal supplied from the controller by comparing a signal filtered to a DC voltage by the input unit to a voltage reference signal, a transformation unit to transform the power signal output from the comparison unit, and a rectification unit to rectify the signal output by the transformation unit, wherein the high voltage power supply further includes a power input delay unit to delay the supply of the power signal to the comparison unit by a predetermined time from when the power supplied from the controller for input into the comparison unit. The high voltage power supply can prevent components of a device from being damaged due to sudden voltage surge in an output power output from an output terminal, which can occur when a time at which a PWM signal is transitioned to a HIGH state. The power signal is delayed with respect to a time at which a high voltage driving power 24 [V] is initially supplied. | 09-18-2008 |
20080232140 | System for transferring an alternating voltage into a direct voltage - A system for transferring an alternating voltage into a direct voltage includes a rectifier, a filter, a transformer, a switch, a switch control circuit and a voltage feedback circuit. The rectifier connects to a main power supply device and rectifies the alternating voltage into a transient direct voltage. The filter filters out a noise from the transient direct voltage and produces a filtering direct voltage. The transformer transfers the filtering direct voltage into a working direct voltage. The switch which has a turn-on status and a cutoff status is used to control the current which goes through the transformer. The switch control circuit is used to control the switch be in the turn-on status or the cutoff status. The voltage feedback circuit drives the switch controlling circuit in accordance with the transformer's voltage and diminishes a switching loss from the switch. | 09-25-2008 |
20080232141 | Power System with Power Converters Having an Adaptive Controller - A power system having a power converter with an adaptive controller. In one embodiment, a power converter coupled to a load includes a power switch configured to conduct for a duty cycle to provide an output characteristic at an output thereof. The power converter also includes a power converter controller configured to receive a signal from the load indicating a system operational state of the load and enable a power converter topological state as a function of the signal. | 09-25-2008 |
20080239760 | Primary only constant voltage/constant current (CVCC) control in 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 the secondary each comprise 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 current feedback circuit is coupled between the primary and a controller. A virtual output current feedback loop is provided for regulating an output current using the reflected voltage signal. | 10-02-2008 |
20080278970 | IN-BODY INFORMATION ACQUIRING APPARATUS AND POWER-SUPPLY CIRCUIT - An in-body information acquiring apparatus includes a function executing unit that realizes a predetermined function inside a body of a patient. A power-supply circuit includes a power unit that includes a cell and that outputs a first current and a first voltage; and a converter that converts the first current to a second current, which is a current required to operate the function executing unit for a predetermined time, and converts the first voltage to a second voltage, which is a voltage required to operate the function executing unit. | 11-13-2008 |
20080285311 | DC-DC CONVERTER - In a DC-DC converter of the present invention, a converting circuit converts a DC-DC voltage outputted from a DC power supply into an AC voltage, and to output to a series circuit in which a primary winding of a first transformer, a first reactor, and a current resonance capacitor are connected to one another in series. A primary winding of a second transformer, a primary winding of a third transformer, and a second reactor constitute a closed loop. A secondary winding of the second transformer and a secondary winding of the third transformer are connected in series to both ends of a secondary winding of the first transformer. A first rectifying/smoothing circuit rectifies and smoothes a voltage of the secondary winding of the second transformer. A second rectifying/smoothing circuit rectifies and smoothes a voltage of the secondary winding of the third transformer. | 11-20-2008 |
20080298089 | Converter Circuit with Forward and Backward Control - The present invention relates to a converter circuit and a conversion method for converting an input signal of a first value to an output signal of a second value based on a switched operating mode, wherein an output feedback loop ( | 12-04-2008 |
20080298090 | Digital Constant On-Time Power Supply Control - A switched voltage regulator provides improved regulation at a lower clock rate/sampling frequency (e.g. several orders of magnitude lower than would be required for comparable regulation) while using a low resolution digital pulse width modulator such that limit cycle oscillations occur (and thus of low cost and complexity and small size) by limiting the amplitude of limit cycle oscillations which therefore need not be avoided by more complex arrangements which are not commercially feasible. Limiting of amplitude of limit cycle oscillations is achieved by adding essentially a digitized ripple voltage signal corresponding to the difference between the output of the voltage regulator and an average output of the voltage regulator as an input to the digital pulse width modulator. Performance of this arrangement may be enhanced by adding a ramp signal to the digitized ripple voltage signal and even further enhanced by limiting the ramp signal to a range which corresponds to steady state operation but not transients. | 12-04-2008 |
20080298092 | Control circuit and method for controlling switching power supply - Control circuit and method for controlling a switching power supply, which regulates its output voltage using pulse-width modulation (PWM) that switches on and off a main switch with a PWM signal (VCONT) at an adjusted ON-period ratio of the main switch. The control circuit includes an error signal amplifier circuit that compares the output voltage with a reference voltage and outputs an error signal VE based on the comparison. The control circuit also includes an ON-period adjusting circuit that starts generating a PWM signal (VCONT) in every cycle based on a pulse VPULSE, the period thereof being fixed, and adjusts the HIGH-period of the PWM signal (VCONT) based on the output voltage of the error signal VE. As a result, the control circuit widens the HIGH-period ratio range or the LOW-period ratio range of the PWM signal greatly. | 12-04-2008 |
20080316775 | Soft-switching circuit for power supply - A soft-switching circuit for a power supply comprises a bridgeless rectifier circuit and an auxiliary circuit. The auxiliary circuit is connected to the bridgeless rectifier circuit, which comprises at least one filtering inductor, two main switches, two diodes and a capacitor. The filtering inductor is connected to the first diode. The first diode is connected to the second diode. The second diode is connected to the first main switch. The first main switch is connected to the second main switch. The diodes and the main switches are connected in parallel with the capacitor to reduce conducting loss. The auxiliary circuit comprises at least one resonant inductor, an auxiliary switch, at least two diodes and a voltage source circuit. The diodes are connected to the resonant inductor and further connected to the voltage source circuit. The voltage source circuit is connected to the auxiliary switch, whereby the soft-switching circuit can accomplish zero voltage switching and zero current switching to provide low conducting loss and low switching loss. | 12-25-2008 |
20090010027 | SWITCHING POWER SUPPLY APPARATUS - A switching power supply apparatus which includes a DC power supply, an isolation transformer having primary, secondary and tertiary windings, and a switching element, and in which, by turning the switching element on and off, the high-frequency voltage appearing in the secondary windings of the isolation transformer is rectified to obtain a DC output, power consumption can be decreased during standby (in burst mode) in particular by means of a control circuit which controls the turn-on and turn-off of the element and similar. | 01-08-2009 |
20090034301 | Switching Power Converter Controlled by a Winding Voltage Sampler - This invention discloses a switching power converter controlled by a winding voltage sampler, including an input circuit with an input end, an output circuit with an output end, one or more switches, a controller to regulate on/off of the switch, a winding voltage sampler, and a transformer including a primary-side coil assembly connecting the switch and the winding voltage sampler, and a secondary-side coil assembly. The output circuit connects the secondary-side coil assembly; the winding voltage sampler detects preset reference voltage of the primary-side coil assembly for the controller to regulate output voltage | 02-05-2009 |
20090040791 | ENHANCEMENT OF POWER CONVERSION EFFICIENCY USING DYNAMIC LOAD DETECTING AND TRACKING - A switching mode power converter may include a modulation circuit to dynamically control a variable switching frequency of the power converter based on an error voltage of the power converter. The power converter may also include a control circuit connected to the modulation circuit and arranged to dynamically limit an inductor current in the power converter while the switching frequency of the power converter changes. A variable limit on the inductor current may be based on the error voltage of the power converter, a load current of the power converter, or information from a power manager of a system in which the power converter resides. In some implementations, the power converter may also include a disabling circuit to control the modulation circuit to disable the variable switching frequency when a sufficiently large load transient is detected. | 02-12-2009 |
20090086511 | CONVERTER CIRCUIT WITH PULSE WIDTH FREQUENCY MODULATION AND METHOD THEREOF - A converter circuit is provided herein. In the converter, a voltage converting unit receives an input voltage and outputs an output voltage according to the magnitude of the input voltage by switching operation based on a control clock signal. A comparing circuit generates a power good pulse signal by comparing the output voltage with a reference voltage. A pulse width frequency modulation circuit receives the power good pulse signal and a source clock signal to provide the control clock signal. The pulse width of the source clock signal is varied gradually and the frequency of the source clock signal is also changed during a period that the power good pulse signal remains in the first logic state, and the pulse width frequency modulated source clock signal is output as the control clock signal. | 04-02-2009 |
20090147544 | MODULATED TRANSFORMER-COUPLED GATE CONTROL SIGNALING METHOD AND APPARATUS - A modulated transformer-coupled gate control signaling method and apparatus provides reduction of circuit complexity and robust design characteristics in switching power circuits having a transformer-coupled gate drive. A modulated control signal at a rate substantially higher than the switching circuit gate control rate is provided from the controller circuit to a demodulator via transformer coupling. Power for the demodulator can be obtained by rectifying the modulated control signal at the demodulator, or from another transformer winding. The modulation scheme is chosen to have a DC average value of zero, eliminating any magnetization current management requirements. The modulated control signal may carry redundant control information and/or may encode additional information to provide a more sophisticated gate drive control, such as oversampled gate control information. | 06-11-2009 |
20090147545 | HISTORY-INDEPENDENT NOISE-IMMUNE MODULATED TRANSFORMER-COUPLED GATE CONTROL SIGNALING METHOD AND APPARATUS - A history-independent and noise-immune modulated transformer-coupled gate control signaling method and apparatus provides robust design characteristics in switching power circuits having a transformer-coupled gate drive. A modulated control signal at a rate substantially higher than the switching circuit gate control rate is provided from the controller circuit to a demodulator via transformer coupling. Codes specified by relative timing of transitions in multiple periods of the modulated control are assigned to gate-on and gate-off timing events that control the switching transistor gate(s) and unassigned patterns are decoded as gate-off events, reducing the possibility that a switching transistor will be erroneously activated due to noise. The modulated signal is constructed so that signal history is not required for decoding, eliminating any requirement of a reference clock. Blanking may be employed to conserve power between codes and to avoid mis-triggering due to noise events during power switching. | 06-11-2009 |
20090168462 | CIRCUIT DEVICE AND METHOD OF PROVIDING FEEDBACK ACROSS AN ISOLATION BARRIER - In an embodiment, a circuit device includes a network interface responsive to a powered network to receive a power supply and data and includes an electrical isolation barrier adapted to define a non-isolated power domain and an isolated power domain. The circuit device further includes a first control circuit associated with the non-isolated power domain. The first control circuit is coupled to a primary winding of a transformer to control current flow via the primary winding. The circuit device also includes a second control circuit associated with the isolated power domain. The second control circuit is coupled to a secondary winding of the transformer and is adapted to detect a power error associated with the secondary winding. The second control circuit transfers a command across the electrical isolation barrier to the first control circuit to adjust a current at the primary winding in response to detecting the power error. | 07-02-2009 |
20090175055 | Power supplying device - A power supplying device includes: an output transformer including first and second output coils for generating first intermediate voltages from an input voltage; a voltage adjusting transformer including primary and secondary coils; a first rectifying-and-filtering circuit connected to the first output coil for generating a first output voltage from the first intermediate voltage obtained from the first output coil; the primary coil being connected in parallel to the first output coil, the secondary coil being connected in series to the second output coil and being coupled to the primary coil for generating a second intermediate voltage from the first intermediate voltage obtained from the first output coil; and a second rectifying-and-filtering circuit connected to the secondary coil for generating a second output voltage from a combined voltage combining the second intermediate voltage obtained from the secondary coil with the first intermediate voltage obtained from the second output coil. | 07-09-2009 |
20090180302 | SWITCHING POWER SUPPLY APPARATUS AND SEMICONDUCTOR DEVICE USED IN THE SWITCHING POWER SUPPLY APPARATUS - A switching power supply apparatus having a highly accurate overvoltage protection function which is free of erroneous operation is provided. A regulating circuit connected to an auxiliary winding generates an AC voltage proportional to a voltage component in which the ringing component has been removed from the AC voltage induced in the auxiliary winding by the switching operation of a switching element. If the peak value of the AC voltage generated by the regulating circuit is equal to or greater than a prescribed value, an overvoltage detection circuit controls the switching operation of the switching element so as to reduce the output DC voltage. | 07-16-2009 |
20090190378 | POWER SUPPLY DEVICE OUTPUTTING PULSED ELECTRICAL CURRENT - The power supply device of the present invention which outputs pulsed electrical current includes an inverter which converts an input voltage to high frequency AC, a rectifier which rectifies the output of the inverter and converts it to DC, and an output polarity changeover unit which, via a reactor, alternatingly turns ON and OFF the output at a positive electrode side of the rectifier and the output at a negative electrode side thereof. Moreover, this power supply device includes a current transformer including a closed magnetic circuit or coil, pierced by a first output current line in which the current at the positive electrode flows, and by a second output current line in which the current at the negative electrode flows. The directions of piercing of the output current lines through the current transformer are set so that the directions in the current transformer, in which current flows in the first and second output current lines, are the same. | 07-30-2009 |
20090290387 | SWITCHING POWER SUPPLY WITH INCREASED EFFICIENCY AT LIGHT LOAD - A switching power supply with the increased efficiency at light load has a switching power circuit, a power monitoring circuit and a light load power supplying circuit. The switching power circuit converts an AC power to a stable DC power and sends the DC power to a load according to voltage variation of the load. When the power monitoring circuit detects the AC power and determines that the load is in a light state, the power monitoring circuit controls the light load power supplying circuit to output a small-power DC to the load. As the DC power provided by the light load power supplying circuit is small, the switching loss ratio is lower in its light load state. Therefore, the operating efficiency at the light load state is higher. | 11-26-2009 |
20100008106 | SWITCHING CONTROL CIRCUIT, SEMICONDUCTOR DEVICE AND SWITCHING POWER SOURCE APPARATUS - At the starting time and an overload time in which the output voltage of the switching power source apparatus is low, if an overcurrent state, in which the ON period of the switching device becomes short and a current not less than the current limit value of the switching device flows through the switching device, occurs, this overcurrent state is detected. The blanking period of a blanking pulse signal is made shorter than the blanking period that is obtained during steady operation, and the ON period of the switching device is made shorter. Hence, the device current flowing through the switching device can be made small in each pulse for the switching operation, and, at the same time, the device current is suppressed from increasing each time a pulse for the switching operation is generated. | 01-14-2010 |
20100053998 | SWITCHING POWER SUPPLY DEVICE - A switching power supply device includes: a transformer that has a primary winding and a secondary winding; a switching element connected to the primary winding of the transformer; a control circuit that controls the switching element to be turned on/off in a case where a voltage is inputted to the primary winding of the transformer, and thereby induces a voltage in the secondary winding of the transformer; and a rectifying/smoothing circuit that rectifies and smoothes the voltage induced in the secondary winding of the transformer, and outputs the rectified and smoothed voltage to a load. The control circuit has: a current control unit that controls the switching element to prevent a current flowing through the switching element from being lowered to a fixed value or less in a case where the load is light; and an intermittent control unit that, in the case where the load is light, controls the switching element to perform an intermittent oscillation operation based on a feedback signal corresponding to an output voltage to the load. | 03-04-2010 |
20100053999 | Switching Mode Power Supply And The Driving Method Thereof - The present invention relates to a switching mode power supply and a driving method thereof. In the present invention, a supply voltage is generated by using a start voltage that corresponds to input power, and a switching operation frequency of a power switch is changed according to an increase/decrease of the supply voltage. | 03-04-2010 |
20100067259 | FORWARD-FLYBACK CONVERTER WITH ACTIVE-CLAMP CIRCUIT - The present invention discloses a forward-flyback converter with active-clamp circuit. The secondary side of the proposed converter is of center-tapped configuration to integrate a forward circuit and a flyback circuit. The flyback sub-circuit operating continuous conduction mode is employed to directly transfer the reset energy of the transformer to the output load. The forward sub-circuit operating discontinuous conduction mode can correspondingly adjust the duty ratio with the output load change. Under the heavy load condition, the mechanism of active-clamp flyback sub-circuit can provide sufficient resonant current to facilitate the parasitic capacitance of the switches to be discharged to zero. Under the light load condition, the time interval in which the resonant current turns from negative into positive is prolonged to ensure zero voltage switching function. Meanwhile, the flyback sub-circuit wherein the rectifier diode is reverse biased is inactive in order to further reduce the power losses. | 03-18-2010 |
20100067260 | POWER SUPPLY - In a switched mode power supply, and in accordance with a method for operating a switched mode power supply, the magnitude of each occurrence of a current flowing during operation of a power output switch is sensed for negative feedback control. A sense voltage is generated proportional to the primary supply voltage. Whenever the sense voltage exceeds a threshold, output power of the power supply is limited by increasing the sensed magnitude of each occurrence of the flowing currents by adding to each sensed magnitude a voltage proportional to the sense voltage. Threshold voltages can be selected by using Zener diodes having different breakdown voltages. Respective ranges within the overall range of the primary supply voltage in which supplemental power limiting occurs and does not occur can thus be controlled. | 03-18-2010 |
20100091524 | Electronic Power Protection Circuit And Applications Thereof - An electric power protection circuit connected in series to a secondary side circuit of a transformer in a switch mode power supply includes a voltage/current limiting device to get an electric power signal output from the secondary side circuit of the transformer that goes through current and voltage limitation before being output and a constant current/voltage controller to get the electric power signal which has the current and voltage limited by the voltage/current limiting device. The electric power signal further is undergone constant voltage/current control to achieve voltage overshoot protection. | 04-15-2010 |
20100124078 | ELECTRONIC DEVICE AND POWER SUPPLY THEREOF - A power supply includes a first convertor, a second convertor, and a transformer. The first convertor generates an alternating current (AC) voltage. The transformer includes a primary winding and a secondary winding. The primary winding is connected to the first convertor and receives the AC voltage. The secondary winding includes a first tap, a second tap, and a third tap disposed between the first tap and the second tap. The second convertor includes a first rectifier circuit connected to the first tap and the second tap, and a second rectifier circuit connected to the third tap. The first rectifier circuit generates a first direct current (DC) voltage. The second rectifier circuit generates a second DC voltage. | 05-20-2010 |
20100128499 | STEP-DOWN VOLTAGE CONVERTER - A step-down voltage converter ( | 05-27-2010 |
20100128500 | SWITCHING POWER CONVERSION CIRCUIT - A switching power conversion circuit includes a power circuit, a feedback circuit and a control circuit. The power circuit includes a switching circuit and a first magnetic element. The first magnetic element generates a magnetic flux change by alternately conducting or shutting off the switching circuit, so that an input voltage is converted into the output voltage by the power circuit. The feedback circuit generates a feedback signal according to the output voltage. The control circuit is used for controlling an on duration and an off duration of the switching circuit, thereby maintaining the output voltage at a rated voltage. The off duration of the switching circuit is maintained at a constant interval under control of the control circuit. The on duration of the switching circuit is adjusted to be a specified interval smaller than a maximum on duration according to the magnitude of the input voltage. | 05-27-2010 |
20100135048 | SWITCHING POWER SUPPLY DEVICE AND METHOD OF STARTING THE SAME - To reduce power loss during standby. | 06-03-2010 |
20100157629 | SEMICONDUCTOR LASER APPARATUS - A switching power supply includes: a blanking period generating circuit for prohibiting a main switching element from being turned on from the time the main switching element is turned on to the time a blanking time elapses; a soft start period generating circuit for generating a soft start period from the start of the oscillation of the main switching element to the lapse of a soft start time; and a blanking time adjusting circuit for generating a signal for shortening the blanking time in the soft start period as compared with after the lapse of the soft start period. | 06-24-2010 |
20100165666 | PRIMARY-SIDE FEEDBACK CONTROL DEVICE AND RELATED METHOD FOR A POWER CONVERTER - A primary-side feedback control device for a power converter includes a control unit for generating a pulse signal according to a feedback signal for controlling on and off states of a switching transistor of the power converter, a comparator coupled to an auxiliary winding of a primary side of the power converter for generating at least one control signal according to a voltage on the auxiliary winding and a reference voltage, a sample-and-hold unit coupled to the auxiliary winding, the comparator, and the control unit for generating the feedback signal according to the voltage on the auxiliary winding and the at least one control signal, and a voltage generator coupled to the control unit, the comparator, and the sample-and-hold unit for generating the reference voltage according to the feedback signal. | 07-01-2010 |
20100165667 | Power System with Power Converters Having an Adaptive Controller - A power system having a power converter with an adaptive controller. The power system is coupled to a load and includes a power system controller that receives a signal indicating a system operational state of the load and selects a power converter operational state as a function thereof. The power system also includes a power converter with a power switch that conducts for a duty cycle to provide a regulated output characteristic at an output thereof. The power converter also includes a controller that receives a command from the power system controller to enter the power converter operational state and provides a signal to control the duty cycle of the power switch as a function of the output characteristic and in accordance with the command, thereby regulating an internal operating characteristic of the power converter to improve an operating efficiency thereof as a function of the system operational state. | 07-01-2010 |
20100195354 | FULL-RANGE-DUTY PWM SIGNAL GENERATION METHOD, APPARATUS, AND SYSTEM USING SAME - The present invention discloses a full-range-duty PWM signal generation method for an AC-to-DC power conversion, comprising the steps of: generating a saw-tooth signal with a predetermined valley voltage; generating a reference signal according to at least one of a current feedback signal and a voltage feedback signal; and generating a PWM signal according to voltage comparison of the saw-tooth signal and the reference signal. Furthermore, the present invention also provides a full-range-duty PWM signal generation apparatus for an AC-to-DC power conversion, and a system using the full-range-duty PWM signal generation apparatus. | 08-05-2010 |
20100238688 | POWER SUPPLY APPARATUS - The DC power supply apparatus includes a switching operation control part that is provided between a current detection part to detect a current flowing through a primary coil of a transformer and a control part to control the operation of a switching part and controls the operation of the switching part according to an output voltage so that consumption power in a low-load state can be further reduced. | 09-23-2010 |
20100254165 | POWER SUPPLY - A switching “power ( | 10-07-2010 |
20100302811 | SINGLE-STAGE POWER SUPPLY WITH POWER FACTOR CORRECTION AND CONSTANT CURRENT OUTPUT - An example controller includes first, second and third inputs, a delayed ramp generator and a drive signal generator. The first, second and third inputs are coupled to receive an input voltage sense signal, an output voltage sense signal, and an input current sense signal, respectively. The drive signal generator is coupled to receive an input charge control signal generated by an input charge control signal generator and a delayed ramp signal generated by a delayed ramp generator. The input charge control signal is generated responsive to an integral of the input current sense signal multiplied by a ratio of the input voltage sense signal to the output voltage sense signal, where the drive signal generator produces a drive signal responsive to the input charge control signal and the delayed ramp signal, the drive signal to be coupled to control a switch of a power supply to regulate an output of the power supply. | 12-02-2010 |
20100302812 | ADAPTER POWER SUPPLY - The present invention relates to an adapter power supply, which includes a switching unit for switching a DC voltage; a transformer which has a primary winding connected to the switching unit, a secondary winding electromagnetically coupled to the primary winding, and an auxiliary winding electromagnetically coupled to the primary winding; a rectifier for rectifying a voltage outputted from the transformer; and a controller for controlling the switching unit to operate according to the PWM scheme in a normal operation mode, and to operate according to a quasi-resonant scheme in a standby mode, by detecting information of a load connected to the rectifier. | 12-02-2010 |
20100302813 | DUAL-MODE CONSTANT LOAD CONTROL CIRCUITS AND ASSOCIATED METHODS - Dual-mode AC/DC power converters and associated methods of operation are disclosed herein. In one embodiment, the AC/DC converter includes a primary winding, a switching transistor coupled to the primary winding, the switching transistor configured to carry a drain-source current, and a feedback voltage port configured to carry a feedback voltage. The feedback voltage port is coupled to the switching transistor to switch off the switching transistor when the drain-source current reaches a peak current limit. The peak current limit increases with increasing feedback voltage if and only if the feedback voltage satisfies an ordered relationship with a threshold. | 12-02-2010 |
20100302814 | CONTROLLER FOR SWITCHING POWER SUPPLY - A switching power supply has an inductor that includes a coil. A chopper circuit chops the primary current drawn through the coil, for the inductor to output an induced current. A multifunction junction of the power supply has a multifunction voltage that is a function of a primary voltage that drives the coil. A first circuit suspends the chopping in response to a first sensed voltage crossing a first threshold, the first sensed voltage being a function of the multifunction voltage. A second circuit suspends the chopping in response to a second sensed voltage crossing a second threshold, the second threshold being a function of the multifunction voltage. | 12-02-2010 |
20100309690 | SWITCHING POWER SUPPLY APPARATUS AND SEMICONDUCTOR DEVICE - The switching power supply apparatus according to the present invention includes: a transformer including a primary winding, a secondary winding, and an auxiliary winding; a switching device connected to the primary winding; an output voltage generation circuit which is connected to the secondary winding and generates an output voltage; an auxiliary power voltage generation circuit which is connected to the auxiliary winding and generates an auxiliary power voltage; and a control circuit which operates using the auxiliary power voltage and controls a driver circuit so that an intermittent oscillation is performed when the output voltage is higher than a first output voltage and controls a peak of a current flowing through a switching device is lower than a peak in a normal mode, when the auxiliary power voltage is lower than a first auxiliary power voltage in the intermittent oscillation. | 12-09-2010 |
20110032730 | SAMPLING CIRCUIT AND CONTROL METHOD - An embodiment provides a sampling circuit, which has a sampling capacitor and a voltage compensation circuit. The voltage compensation circuit has a reference capacitor and a compensation circuit. The sampling capacitor samples a voltage signal and memorizes the signal as a sampling signal. The reference capacitor memorizes a reference signal with a predetermined value. The compensation circuit changes the reference signal with a recovery amount to recover the reference signal to the predetermined value, and simultaneously changes the sampling signal with an adjustment amount. | 02-10-2011 |
20110075449 | Compact Power Transformer Components, Devices, Systems and Methods - Disclosed herein are various embodiments of compact coil power transformers configured to provide high voltage isolation and high voltage breakdown performance characteristics in small packages. Compact coil transformers are provided across which power may be transmitted and received by primary and secondary coils disposed on opposing sides of a substrate without high voltage breakdowns occurring therebetween. At least portions of the compact coil transformer are formed of an electrically insulating, non-metallic, non-semiconductor, low dielectric loss material. The compact coil transformers may be formed in small packages using, by way of example, printed circuit boards, flex circuits, lead frames, CMOS and other fabrication and packaging processes. | 03-31-2011 |
20110090716 | DC-DC CONVERTER WITH SNUBBER CIRCUIT - In order to achieve an object to reduce a surge voltage and suppress noise generation, the present invention provides a DC-DC converter with a snubber circuit, which boosts a voltage Vi of a DC power supply. The snubber circuit includes: a series circuit connected to both ends of a smoothing capacitor Co and including a snubber capacitor Cs and a snubber resistor Rs; a snubber diode Ds | 04-21-2011 |
20110194309 | METHOD AND APPARATUS TO CONTROL A POWER CONVERTER HAVING A LOW LOOP BANDWIDTH - A power converter controller is disclosed. An example power converter controller includes a feedback sensor circuit coupled to receive a feedback signal representative of an output of the power converter. The controller also includes a feedback sampling signal generator coupled to generate a feedback sampling signal coupled to be received by the feedback sensor circuit. The feedback sensor circuit is coupled to sample the feedback signal in response to the feedback sampling signal. The controller also includes a state machine coupled to the feedback sensor circuit to control switching of a switch of the power converter circuit according to one of a plurality of operating condition states in response to the feedback sensor circuit. The controller also includes a feedback time period signal generator coupled to generate a feedback time period signal coupled to be received by the state machine. A period of a feedback time period signal is substantially greater than a period of the feedback sampling signal. The state machine is coupled to be updated in response to the feedback time period signal. | 08-11-2011 |
20110228565 | SWITCHMODE POWER SUPPLY FOR DIMMABLE LIGHT EMITTING DIODES - A power supply has a rectifier for producing a supply voltage from an AC source. A transformer includes a primary winding, a secondary winding, and an auxiliary winding, wherein the supply voltage is applied to the primary winding by a first switch. A controller, powered by voltage at a node, pulses the first switch between conductive and non-conductive states. A second rectifier is coupled between the auxiliary winding and the node. A starting resistor applies voltage derived from the supply voltage to the node. A second switch, in series with the starting resistor, is rendered non-conductive by a delay circuit a defined time period after a given voltage occurs at the node. When the power supply initially activates, the starting resistor supplies voltage to the node, soon thereafter voltage is supplied from the secondary winding. When the defined time period elapses, the delay circuit operationally disconnects the starting resistor. | 09-22-2011 |
20110267843 | METHOD AND APPARATUS TO LIMIT OUTPUT POWER IN A SWITCHING POWER SUPPLY - An example integrated circuit controller for a power supply includes a modulator, a drive signal generator, a comparator, and a variable current limit generator. The modulator generates an enable signal having logic states responsive to a feedback signal. The drive signal generator either enables or skips enabling a switch of the power supply during a switching period in response to the logic state of the enable signal. The comparator asserts an over current signal to disable the switch if current flowing through the switch exceeds a variable current limit. The variable current limit generator sets the variable current limit to a first current limit in response to one logic state of the enable signal during a switching period and sets the variable current limit to a second current limit if the enable signal transitions logic states and the over current signal is asserted during the switching period. | 11-03-2011 |
20110273910 | METHOD AND APPARATUS FOR A CONTROL CIRCUIT WITH MULTIPLE OPERATING MODES - An example controller for use in a power converter includes an oscillator and a logic circuit. The oscillator is to be coupled to a switch of the power converter and determines a switching cycle period of the switch. The logic circuit is also to be coupled to the switch to control a duty cycle of the switch in response to a magnitude of a feedback signal to regulate an output of the power converter. The logic circuit controls the duty cycle of the switch such that a control loop gain of the power converter is substantially constant during a transition of the controller between duty cycle control modes. | 11-10-2011 |
20110305043 | ISOLATED SWITCHING POWER SUPPLY APPARATUS - A control IC including a full-bridge circuit is disposed on a primary side and a secondary side. Bidirectional communication is performed between the primary side and the secondary side in a state in which they are isolated. A control signal output from the primary side or the secondary side earlier is preferentially processed. As a result, the authority to control a switching element can be freely given to a primary-side control IC or a secondary-side control IC, and any control processing can be performed with software. | 12-15-2011 |
20110317451 | REVERSE CURRENT LIMIT PROTECTION FOR ACTIVE CLAMP CONVERTERS - DC-to-DC converters are protected from damage by, among other things, monitoring and controlling forward and reverse currents in their transformer primary windings. The currents are discontinued if their values fall outside a predetermined range or if they flow during a portion of the switching cycle in a manner that would result in cross-conduction. Power switches in these converters are also protected from damage by adjusting the maximum duty cycles of these converters to vary with their input voltages. In this way, the maximum voltage across the power switches is kept within a relatively narrow range. These protective features can be combined in any number of ways to fit the application at hand. | 12-29-2011 |
20120033450 | MULTIPLE POWER SUPPLIES BALANCE SYSTEM - A multiple power supplies balance system includes a plurality of power supply circuits on a circuit board each having a power output route. Each power supply circuit includes a power supply feedback unit which has a reference level terminal to determine output potential of the power supply circuit. The circuit board also has an output route electrically connected to the power output route to converge current sending to a load. Thus the circuit board contains multiple sets of power supply circuits coupled in parallel. The circuit board also has a proportion distribution circuit to correct output variations of each power supply circuit. The proportion distribution circuit includes a variable impedance element which is electrically connected to the reference level terminals and controllable to proportionally change equivalent impedance connected to each reference level terminal, thus change proportionally output potential of each power supply circuit. | 02-09-2012 |
20120106205 | POWER SUPPLY WITH OPEN-LOOP PROTECTION AND SHORT-CIRCUIT PROTECTION - The power supply according to the present invention comprises a transformer, a power switch, a signal generating circuit, an on-time detection circuit, and a delay circuit. The transformer receives an input voltage and generates an output voltage. The power switch switches the transformer for regulating the output voltage. The signal generating circuit generates a switching signal for controlling switching of the power switch. The on-time detection circuit detects an on-time of the power switch and generates a short-circuit signal. The delay circuit counts to a first delay time or to a second delay time in response to a feedback signal of the power supply and the short-circuit signal to generate a turn off signal for controlling the signal generating circuit to latch the switching signal. | 05-03-2012 |
20120113684 | Compensation Circuit for Constant Current Regulation of Power Supply and Method Thereof - A compensation circuit and method for constant current regulation of switching mode power supply are disclosed. The ringing waveform of a feedback signal, indicative of the output current of the power supply, causes error. To eliminate the error, a current source charges a capacitor in response to a demagnetizing oscillation signal indicative of the error caused by the ringing waveform of the feedback signal. The voltage across the capacitor is compared to a reference signal to generate a more accurate signal indicative of the conductive time of a secondary diode in a secondary winding of the switching mode power supply. This more accurate signal is inputted to a logic circuit to generate a constant current control signal to control a power switch of the power supply. | 05-10-2012 |
20120113685 | POWER SUPPLY SYSTEM AND IMAGE FORMING APPARATUS - A power supply system includes: a switching power supply; and a control device, wherein the switching power supply includes: a transformer; a semiconductor switching element; a switch control unit; and a rectifying/smoothing circuit, the switch control unit is supplied with power from the main power supply, starts to control the switching of the semiconductor switching element, and oscillates a primary side of the transformer to induce a voltage on the secondary side of the transformer, the control device outputs a control pulse signal to the switch control unit to stop the oscillation of the transformer, thereby changing the mode of the switching power supply to an output stop mode, in an output mode in which the switching power supply smoothes the voltage induced on the secondary side and outputs the smoothed voltage. | 05-10-2012 |
20120120685 | CONTROL METHOD AND CONTROL MODULE FOR CONTROLLING AN ASYMMETRIC DC-DC CONVERTER - A control method is provided for controlling an asymmetric DC-DC converter including first and second power switches that are driven respectively by first and second control signals, and a voltage-converting circuit that is operatively associated with the first and second power switches for generating an output signal. The voltage-converting circuit includes a primary coil unit and a secondary coil unit operatively associated therewith for voltage conversion, and including first and second coils that have a turn ratio not equal to one. The control method includes: sampling the output signal to obtain a sample signal corresponding thereto; and generating the first and second control signals, which correspond respectively to first and second duty cycles having a sum of one, based on a comparison between the sample signal and a reference signal such that the first and second power switches are driven in an alternating manner. | 05-17-2012 |
20120127760 | SWITCHING POWER SUPPLY AND ELECTRONIC DEVICE USING THE SAME - A switching power supply includes: transformer 60 which includes a primary winding and a secondary winding and outputs, through the secondary winding, an AC voltage based on the current supplied to the primary winding; switching element 61 which controls current supply to the primary winding; rectifying/smoothing circuit 65 which converts the AC voltage output from the secondary winding into a DC voltage; voltage detecting circuit 62 which detects the DC voltage converted by rectifying/smoothing circuit 65; feedback amplifier 63 which is supplied with the DC voltage detected by voltage detecting circuit 62 as one input and which is supplied with a reference voltage as the other input, so as to output a difference between the input voltage values; and control circuit 64 which controls switching element 61, so as to eliminate the difference detected at feedback amplifier 63. Upon receipt of an instruction signal from the outside, voltage detecting circuit 62 supplies to feedback amplifier 63, a voltage higher than the voltage output before receipt of the instruction signal. | 05-24-2012 |
20120176816 | STARTING UP A DC/DC CONVERTER HAVING A HIGH-FREQUENCY TRANSFORMER - During startup of a DC/DC converter having a high-frequency transformer whose primary winding is supplied with current from an input-side DC link via an inverter bridge having pulsed switches and whose secondary winding is used to charge an output-side DC link via a rectifier bridge. The switches of the inverter bridge are operated to load the output-side DC link, in a manner that deviates from a normal operation of the switches in order to limit the currents that flow in the DC/DC converter during startup of the DC/DC converter. Particularly, the switches of the inverter bridge are operated during startup of the DC/DC converter at a pulse width that is fixed during each of a limited number of stages of the startup, and have a duty cycle that is not more than 5 percent during each of the stages of the startup. | 07-12-2012 |
20120188796 | POWER COUPLING SYSTEM AND METHOD - Systems and methods for the coupling of power through an isolation transformer. The systems generally include a primary side electrically connectable to the primary winding of an isolation transformer, a secondary side electrically connectable to the secondary winding of the isolation transformer, a primary side switch sending power pulses to the secondary side, and a secondary side feedback circuit sending a feedback signal to the primary side. A pulse detector sends power pulses to the secondary side in response to the feedback signal, while a watchdog timer sends a power pulse to the secondary side if a feedback signal is not detected within a predetermined period of time. Secondary side circuits including a slow-start circuit and a wake circuit portion manage initialization and low-load operating power requirements, respectively. | 07-26-2012 |
20120195075 | DIRECT CURRENT/DIRECT CURRENT CONVERTER, AND POWER SUPPLY APPARATUS AND ELECTRONIC DEVICE USING THE SAME - A direct current (DC)/DC converter capable of lowering power consumption and capable of being started in a short time is provided. A voltage generated at a second output capacitor is input to a power supply terminal. An input voltage is input to a high voltage terminal. A charging transistor is a N-channel Metal Oxide Semiconductor Field Effect Transistor disposed between the high voltage terminal and the power supply terminal and applied with a bias so that the charging transistor is normally on. In a first state, in which the voltage of the power supply terminal is lower than a specified first threshold voltage, a current limiting circuit limits a charging current flowing from the high voltage terminal to the power supply terminal, and in a second state in which the voltage is higher than a second threshold voltage, the current limiting circuit lowers the charging current substantially to zero. | 08-02-2012 |
20120212978 | Low Power Switch Mode Power Supply - A device and a method for operating a low power switch mode power supply, where OC input power is converted to AC power by an oscillator, which AC power is transformed to an AC voltage and AC current, which output power is converted into DC power, where the DC voltage is used as a feedback signal for controlling the oscillator. It is the object of the invention to reduce a standby power consumption of power consuming devices. The oscillator comprises a first and a second current loop, which first current loop generates an activation current for the second current loop, where the primary coil of a transformer is part of the second current loop, and where the second loop comprises a current/voltage measuring system and generates increasing current in the second current loop and closes the current flow in the second current loop. | 08-23-2012 |
20120230062 | DC-DC CONVERTER - A DC-DC converter includes a series circuit including a primary transformer coil and a main switch element connected between a power input terminal and a ground terminal. A secondary transformer coil is connected to a rectifying/smoothing circuit including rectification-side and commutation-side synchronous rectifiers, a smoothing capacitor, and a choke coil. The output voltage from the rectifying/smoothing circuit is supplied to a load connected to a power output terminal. An input voltage detection circuit detects the voltage between the power input terminal and the ground terminal, and supplies a detection signal to a VIN terminal of a switching control circuit. The switching control circuit performs PWM control to maintain a constant output voltage output to the load, reduces the switching frequency when the input voltage input to the VIN terminal is low, and increases the switching frequency in accordance with an increase in the input voltage. | 09-13-2012 |
20120243265 | CONTROL DEVICE FOR DC/DC CONVERTER - Disclosed herein is a control device for a DC/DC converter, in which FB control and FF control are combined to estimate an output voltage of a nonlinear dynamic system while guaranteeing stability. The control device includes a FB controller which generates a first time value for switch-off timing as the amount of feedback control, a machine learning controller which generates a second time value for switch-off timing as the amount of FF control, and a difference time calculator which obtains a difference between the first time value and the second time value and transmits a difference signal to the drive circuit. The machine learning controller calculates a second time value by multiplying the deviation between the target value of the machine learning control and the estimation value from leaning history in certain sampling by α=A·e×p(−λ×n) (A: a factor (except for zero) for suppressing the first undershoot, λ: a factor (constant except for zero) for suppressing the second undershoot, and n: an integer indicating the nth sampling). | 09-27-2012 |
20120287679 | SWITCHING TECHNIQUES TO REDUCE CURRENT OVERSHOOT IN A DC TO DC CONVERTER - A DC/DC converter system includes gate control circuitry, a transformer, a second stage, and soft start control circuitry. The gate control circuitry is configured to generate a first and a second gate control signal configured to open and close first and second switches of an inverter circuitry, respectively, to generate an AC signal from a DC input signal. The transformer transforms the AC signal and the second stage rectifies the AC signal to a DC output signal. The soft start control circuitry generates a signal to delay a closing of the first switch during an initial portion (Td) of a first cycle of the first switch. A method of soft-starting a DC/DC converter includes generating first and second gate control signals and delaying closing of the first switch during Td. | 11-15-2012 |
20120294046 | POWER SUPPLY APPARATUS - A second control circuit is configured to switch a pulse signal to a level which turns off a second switching transistor when a coil current that flows through a primary winding reaches a predetermined threshold current. The second control circuit is configured to start a switching operation when a power supply for an electronic device is turned on, to set the threshold current to a first value when an intermediate voltage is higher than a predetermined level, and to set the threshold current to a second value that is lower than the first value when the intermediate voltage is lower than a predetermined level. A first control circuit is configured to start a switching operation upon receiving an instruction from a microcontroller to start operating. | 11-22-2012 |
20120307530 | POWER SUPPLY DEVICE AND METHOD FOR CONTROLLING SAME - In a normal operation, a switch control circuit in a control IC for switching power supply operates to control an opening and closing operation of a switching element. When a remote control receiving circuit issues an instruction to perform a standby operation, an energy saving switch is opened in a period elapsed until an output voltage of a rectification/smoothing circuit for secondary output winding falls below a predetermined value. Thus, an operation of a switch control circuit in the control IC for switching power supply is stopped such that the opening and closing operation of the switching element is not performed. In this case, the remote control receiving circuit and a timer microcomputer are operable with electric power based on a voltage at a smoothing capacitor in the rectification/smoothing circuit for secondary output winding. | 12-06-2012 |
20120314453 | ELECTRONIC CIRCUIT CONTROL ELEMENT WITH TAP ELEMENT - An example control element for use in a power supply includes a high-voltage transistor and a control circuit to control switching of the high-voltage transistor. The high-voltage transistor includes a drain region, source region, tap region, drift region, and tap drift region, all of a first conductivity type. The transistor also includes a body region of a second conductivity type. An insulated gate is included in the transistor such that when the insulated gate is biased a channel is formed across the body region to form a conduction path between the source region and the drift region. A voltage at the tap region with respect to the source region is substantially constant and less than a voltage at the drain region with respect to the source region in response to the voltage at the drain region exceeding a pinch off voltage. | 12-13-2012 |
20120314454 | SWITCHING POWER SUPPLY APPARATUS - In a switching power supply apparatus, a first switching element is controlled by a driving voltage output from a switching control IC. A second switching control circuit controls the on-time of a second switching element so that the time ratio of the on-time of the second switching element to the on-time of the first switching element becomes almost constant with respect to a change in a load current. In a normal load state, since a square wave output from a frequency setting unit within the switching control IC is output with no change, a converter operates in a current-continuous mode. In a light load state, a driving signal generation unit within the switching control IC is subjected to blanking with the period of a signal output from a maximum frequency setting unit and an oscillation frequency is reduced. Accordingly, the converter operates in a current-discontinuous mode. | 12-13-2012 |
20120320633 | VARIABLE FREQUENCY PWM SYNCHRONOUS RECTIFIER POWER SUPPLY - The present invention discloses a variable frequency PWM synchronous rectifier power supply comprising: a transformer, a PWM control circuit and a synchronous rectification switch circuit. The transformer has a primary side and a secondary side, and an isolation circuit is provided for separating the primary side and the secondary side, and the primary side uses a transmit/receive switch circuit to drive the transformer, and the secondary side uses a filter circuit to output different voltages to an external load. The PWM control circuit is situated on the secondary side and coupled to the isolation circuit and filter circuit, for generating a control signal to the isolation circuit to drive the transmit/receive switch circuit. The synchronous rectification switch circuit is situated on the secondary side and coupled to the PWM control circuit for receiving a timing delay control signal provided by the PWM control circuit. | 12-20-2012 |
20120320634 | METHOD AND APPARATUS FOR A CONTROL CIRCUIT WITH MULTIPLE OPERATING MODES - An example controller for use in a power converter includes an oscillator that is to be coupled to a switch of the power converter to determine a switching cycle period of the switch. The controller also includes means for controlling a duty cycle of the switch to regulate an output of the power converter and for maintaining a substantially constant rate of change of the duty cycle with respect to changes in a magnitude of a feedback signal as the controller transitions between duty cycle control modes such that a control loop gain of the power converter is substantially constant during the transition. | 12-20-2012 |
20120327691 | SWITCHED MODE POWER SUPPLY - A power supply has over power protection based on the same signal as used by the feedback path for controlling the switching of the power supply. This means that no additional signal needs to be supplied to the control circuit to implement mains over protection. | 12-27-2012 |
20130003421 | SYSTEMS AND METHODS FOR ADJUSTING CURRENT CONSUMPTION OF CONTROL CHIPS TO REDUCE STANDBY POWER CONSUMPTION OF POWER CONVERTERS - System and method for regulating a power conversion system. For example, a system controller includes a signal generator and one or more power-consumption components. The signal generator is configured to receive a feedback signal related to an output signal of the power conversion system, a current sensing signal and an input voltage, and to generate a control signal based on at least information associated with the feedback signal, the current sensing signal and the input voltage. The power-consumption components are configured to receive the control signal. The signal generator is further configured to determine whether the feedback signal is smaller than a feedback threshold for a first predetermined period of time, the current sensing signal is smaller than a current sensing threshold for a second predetermined period of time, and the input voltage is smaller than a first threshold for a third predetermined period of time in magnitude. | 01-03-2013 |
20130003422 | SWITCHED MODE POWER SUPPLY WITH VOLTAGE REGULATOR - A power supply and method for reliable turn-on of a switched mode power supply (SMPS) in which the same transformer is used for providing power from the primary side to both the main output of the SMPS and a secondary side voltage regulator a train of voltage pulses are transmitted, from the primary side to the secondary side. The voltage regulator generates a feedback signal indicating when it has turned on and is operating, and the transmission of pulses within the train is controlled based on the detection of feedback signal. In this way, only the required amount of power to switch on the voltage regulator is transferred to the secondary side during a start-up operation and excess power at the main output is prevented, thereby avoiding distortion of the desired start-up ramp figure. | 01-03-2013 |
20130027983 | AC/DC CONVERTER, AND AC POWER ADAPTER AND ELECTRONIC APPARATUS USING THE SAME - The present invention provides an Alternating Current/Direct Current (AC/DC) converter employing measures not only against residual voltage but also to reduce power consumption. The AC/DC converter receives an Alternating Current (AC) voltage through a concentric plug and converts the AC voltage into a Direct Current (DC) voltage. A discharge path is disposed on a path from a discharge terminal to a ground terminal. A detection circuit compares a wave detection voltage with a predetermined threshold voltage, and enables the discharge path to be turned on when the wave detection voltage is continuously lower than the threshold voltage for a predetermined detection time. | 01-31-2013 |
20130027984 | CURRENT-FED ISOLATION CONVERTER - A current-fed isolation converter includes a coil that is connected to a primary side of a transformer, a power source that supplies electric power to the primary side of the transformer, a switching element that controls a first electric current flowing in the coil, a snubber circuit that includes a rectifying element and a capacitive element that is charged by a second electric current flowing in the rectifying element, and a step-down power supply circuit that regenerates electric charge of the capacitive element to the power source. The snubber circuit controls an excess voltage that is generated when the switching element is turned off. The power supply circuit maintains a charging voltage of the capacitive element at a predetermined voltage value. | 01-31-2013 |
20130027985 | CONTROL INTEGRATED CIRCUIT OF A SWITCH POWER SUPPLY AND A SWITCH POWER SUPPLY USING THE SAME - A control integrated circuit for controlling a switch power supply, including: a voltage collecting module, configured to collect a feedback voltage based on an output voltage of the switch power supply; an error amplifying module, configured to compare the feedback voltage with a reference voltage and generate an error voltage; a time collecting module, configured to obtain a degaussing time signal based on the feedback voltage; and a constant voltage and current module, configured to collect a peak current feedback signal of a switch transistor, generate a control signal based on the error voltage, the degaussing time signal and the peak current feedback signal, wherein the control signal is for controlling an operating frequency and a duty ratio of the switch transistor, and control the switch transistor according to the control signal. | 01-31-2013 |
20130039097 | POWER CONVERSION APPARATUS - A power conversion apparatus capable of suppressing adverse effects of noise caused by crossing of wiring patterns on a wiring board mounting the apparatus thereon. The apparatus includes a transformer, a switching element connected to the transformer, a feedback rectification circuit, and a control circuit operable to control the switching element in response to a DC voltage from the feedback rectification circuit. A first wiring pattern electrically connecting the feedback rectification circuit and the control circuit is formed in one of two surface regions of the wiring board separated by an imaginary line running through a junction of the first wiring pattern and the feedback rectification circuit and a junction of the first wiring pattern and the control circuit, and a second wiring pattern electrically connecting the control circuit and the switching element is formed outside an area enclosed by the imaginary line and the first wiring pattern. | 02-14-2013 |
20130070485 | SWITCHING POWER CONVERTER AND CONTROL METHOD THEREOF - A switching power converter with an input terminal configured to receive a first input voltage; an output terminal configured to provide an output current to a load, wherein the output current has a peak value and an average value; a power switch; a first loop coupled to the input terminal, wherein the first loop configured to generate a first output signal based on the first input voltage; a second loop configured to generate a second output signal based on the output current; a multiplier configured to generate a multiplying signal based on multiplying the first output signal with the second output signal; and a driving circuit configured to generate a driving signal based on the multiplying signal to control the power switch, so as to reduce the ratio between the peak value and the average value of the output current. | 03-21-2013 |
20130077354 | Controller for a Switched Mode Power Supply - A controller ( | 03-28-2013 |
20130077355 | APPARATUS AND METHOD FOR DETECTING A CHANGE IN OUTPUT VOLTAGE OF AN ISOLATED POWER CONVERTER - A power converter controller includes a drive circuit coupled to control switching of a power switch coupled to an energy transfer element and an input of the power converter. An output voltage sensor including first and second pulse sampler circuits is coupled to capture first and second peak voltages, respectively, that are representative of a second peak of a ringing voltage of a feedback signal representative of an output of the power converter. The first pulse sampler circuit is coupled to capture the first peak voltage at a first time in the feedback signal. The second pulse sampler circuit is coupled to capture the second peak voltage at a second time in the feedback signal. The drive circuit is coupled to receive a change signal from the output voltage sensor in response to the first and second peak voltages. | 03-28-2013 |
20130094249 | SECONDARY SIDE SYNCHRONOUS RECTIFICATION CONTROL CIRCUIT AND SWITCHING CONVERTER - A secondary side synchronous rectification control circuit is disclosed. The control circuit includes an inverted amplifier, a first comparator, and a driving unit. The inverted amplifier has an input end for receiving a drain source voltage signal from a synchronous rectification transistor and outputting an inverted amplification signal. The first comparator receives the inverted amplification signal and a first reference voltage for outputting a first comparison signal. The driving unit receives the first comparison signal and generates a driving signal according to the first comparison signal, for controlling the conduction status of the synchronous rectification transistor. The drain source voltage of the synchronous rectification transistor in the present invention is inverted amplified by an inverted amplifier, and it is connected to a comparator for generating the driving signal. The errors and defects of the turn-off timing of the driving signal may be solved and eliminated. | 04-18-2013 |
20130100708 | POWER FACTOR IMPROVEMENT CIRCUIT - A power factor improvement circuit includes a low frequency filter unit installed between two electrodes of an output terminal of a rectifier unit for adjusting voltage and current inputted to a PWM control IC in-phase, and first and second compensation circuits installed at a current compensation terminal and a voltage compensation terminal of the PWM control IC respectively, and the first and second compensation circuits are provided for reducing the current gain of the phase adjustment unit to avoid any unnecessary action of the PWM control IC, so as to achieve the effect of controlling a power factor to a level over 0.90 when a full voltage of 90-264V is inputted. | 04-25-2013 |
20130114306 | DYNAMIC POWER FACTOR CORRECTION AND DYNAMIC CONTROL FOR CONVERTER IN POWER SUPPLY - A welding or cutting system is provided using an interleaved buck-boost stage which dynamically controls power factor correction and operation of the interleaved buck-boost modules to optimize efficiency and operation of the welding system. | 05-09-2013 |
20130114307 | SYSTEMS AND METHODS FOR PROTECTING POWER CONVERSION SYSTEMS UNDER OPEN AND/OR SHORT CIRCUIT CONDITIONS - System and method are provided for protecting a power converter. The system includes a first comparator, and an off-time component. The first comparator is configured to receive a sensing signal and a first threshold signal and generate a first comparison signal based on at least information associated with the sensing signal and the first threshold signal, the power converter being associated with a switching frequency and further including a switch configured to affect the primary current. The off-time component is configured to receive the first comparison signal and generate an off-time signal based on at least information associated with the first comparison signal. The off-time component is further configured to, if the first comparison signal indicates the sensing signal to be larger than the first threshold signal in magnitude, generate the off-time signal to keep the switch to be turned off for at least a predetermined period of time. | 05-09-2013 |
20130114308 | Switching 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 control circuit of the switching regulator, which controls rectified power within a predetermined range, detects an input voltage and an input current to generate a voltage detection signal and a current detection signal respectively, and the voltage detection signal and the current detection signal are multiplied by one the other to generate a power index. The control circuit generates an error signal according to the power index and a reference signal. A low-pass-filter filters a high frequency band in the process. A control signal generation circuit of the control circuit generates a control signal according to the error signal. And a driver circuit of the control circuit generates an operation signal according to the control signal, for switching a power switch to convert the rectified power to an output voltage. | 05-09-2013 |
20130121035 | ULTRA LOW STANDBY CONSUMPTION IN A HIGH POWER POWER CONVERTER - A power converter includes a dc input having first and second terminals. A main converter is coupled to the first terminal of the dc input. A standby circuit coupled to the second terminal of the dc input and the main converter. The main converter is coupled to control a transfer of energy from the dc input through the standby circuit to a main output of the main converter during a normal operating condition of the power supply. The standby circuit is coupled to decouple the main converter from the second terminal of the dc input during a standby operating condition of the power converter. A standby converter is coupled to the first and second terminals of the dc input to control a transfer of energy from the dc input to a standby output of the standby converter during the standby operating condition of the power converter. | 05-16-2013 |
20130128623 | SWITCHING CONTROL CIRCUIT AND SWITCHING POWER SUPPLY APPARATUS - An external circuit is connected to a polarity detection terminal of a switching control IC. An increased value of the voltage of a pulse signal input to the polarity detection terminal at the time of the activation of a power supply changes in response to this external circuit. Accordingly, owing to the external circuit connected to the polarity detection terminal, the validity/invalidity of a standby mode is set. When the standby mode is validated, a blanking frequency changes in response to the voltage of a feedback terminal, and a switching loss in a light load is reduced. Accordingly, a switching control circuit and a switching power supply apparatus are configured that are able to set the validity/invalidity of the standby mode or select the method of the standby mode without using a dedicated terminal. | 05-23-2013 |
20130128624 | DC/DC CONVERTER - A DC/DC converter has DC input terminals to which a DC power is inputted, a transformer, and a bidirectional switching device on the primary side of the transformer. | 05-23-2013 |
20130135905 | CONTROL METHODS FOR SWITCHING POWER SUPPLIES - An embodiment provides a control method capable of controlling a switching-mode power supply to provide an output power source. The switching-mode power supply has a winding coupled to an input power source and controlled by a switch to be energized or de-energized. The maximum current peak through the winding is set to be a predetermined value. A discharge time of the winding in a switching cycle period is detected. The switching cycle period of the switch is controlled to keep the ratio of the discharge time to the switching cycle period as a constant. | 05-30-2013 |
20130170251 | METHOD AND APPARATUS FOR SENSING MULTIPLE VOLTAGE VALUES FROM A SINGLE TERMINAL OF A POWER CONVERTER CONTROLLER - A controller for use in a power converter includes a sensor coupled to receive a signal from a single terminal of the controller. The signal from the single terminal represents an output voltage of the power converter during at least a portion of an off time of a power switch and a line input voltage during a portion of an on time of the power switch. A switching control is to be coupled to switch the power switch to regulate the output of the power converter in response to the sensor. A power limiter is coupled to the sensor to output a power limit signal to the switching control in response to the line input voltage of the power converter. The switching control is further coupled to switch the power switch to regulate the output of the power converter in response to the power limit signal. | 07-04-2013 |
20130194831 | RESONANT CONVERTER WITH AUXILIARY RESONANT COMPONENTS AND HOLDUP TIME CONTROL CIRCUITRY - A resonant power converter is provided with auxiliary circuit branches and control circuitry for switchably coupling the auxiliary branches to resonant circuit components during holdup times. Auxiliary branches are coupled in parallel with any one or more of a resonant inductor, a resonant capacitor, and a magnetizing inductive winding via respective switches. When a holdup time condition is detected in accordance with, for example, a drop in the mains line voltage, the switches are controlled to adjust the corresponding inductance or capacitance for the duration of the holdup time condition or otherwise for a predetermined duration. The power converter in normal operation is configured for high efficiency and in a holdup time operation is configured to produce sufficient holdup time. | 08-01-2013 |
20130223105 | METHOD AND APPARATUS FOR A POWER SUPPLY CONTROLLER RESPONSIVE TO A FEEDFORWARD SIGNAL - An example power converter includes an energy transfer element, a switch, a feedback circuit, a feedforward circuit, and an integrated circuit controller. The integrated circuit controller includes a gain selector circuit and a switch duty cycle controller. The gain selector circuit selects a gain multiplier according to a value of a feedforward signal generated by the feedforward circuit and applies the gain multiplier to the feedforward signal to generate a duty cycle adjust signal. The switch duty cycle controller generates a drive signal to control the switch in response to a feedback signal generated by the feedback circuit. A duty cycle of the drive signal is varied in response to the duty cycle adjust signal such that the duty cycle varies according to a plurality of linear functions over a range of values of the feedforward signal. | 08-29-2013 |
20130272033 | SYSTEMS AND METHODS FOR CONSTANT VOLTAGE MODE AND CONSTANT CURRENT MODE IN FLYBACK POWER CONVERTERS WITH PRIMARY-SIDE SENSING AND REGULATION - System and method for regulating a power converter. The system includes a first signal generator configured to receive a first sensed signal and generate an output signal associated with demagnetization. The first sensed signal is related to a first winding coupled to a secondary winding for a power converter, and the secondary winding is associated with at least an output current for the power converter. Additionally, the system includes a ramping signal generator configured to receive the output signal and generate a ramping signal, and a first comparator configured to receive the ramping signal and a first threshold signal and generate a first comparison signal based on at least information associated with the ramping signal and the first threshold signal. Moreover, the system includes a second comparator configured to receive a second sensed signal and a second threshold signal and generate a second comparison signal. | 10-17-2013 |
20130279204 | POWER SUPPLY SYSTEM, POWER CONVERTER AND VOLTAGE REGULATING METHOD - A power converter includes a power module, a feedback module, and a control module. The power module is used for converting an input voltage into an output voltage. The feedback module is electrically connected with the power module for generating a feedback voltage according to the output voltage. The control module is electrically connected with the feedback module and the power module for comparing a reference duty cycle value with a duty cycle, generating a variable reference voltage according to the comparison between the reference duty cycle value and the duty cycle, comparing the variable reference voltage with the feedback voltage, and adjusting the duty cycle according to the comparison between the variable reference voltage and the feedback voltage. | 10-24-2013 |
20130286690 | POWER SUPPLY DEVICE - A power supply device includes a first converter which converts an input voltage to a first voltage, a second converter which converts the first voltage from the first converter to a second voltage, a voltage comparison section which compares the first voltage outputted from the first converter with a predetermined reference voltage, a voltage comparison result output section which outputs a first signal until the first voltage is determined to be higher than the predetermined reference voltage by the voltage comparison section and retains a second signal as an output after the first voltage is determined to be higher than the predetermined reference voltage, and a converter control section which controls the second converter to stop when the first signal is outputted from the voltage comparison result output section and controls the second converter to operate when the second signal is outputted from the voltage comparison result output section. | 10-31-2013 |
20130294114 | Direct-Current Converter - A direct-current converter comprises: a first series circuit, which is connected in parallel with a smoothing capacitor and in which a first switching element and a second switching element are connected in series; a second series circuit, which is connected in parallel between main electrodes of the first switching element and in which a resonance capacitor, a resonance reactor and a primary winding of a transformer are connected in series; a half wave rectification smoothing circuit, which rectifies and smoothes a voltage of a secondary winding of the transformer; a control circuit configured to alternately turn on and off the first switching element and second switching element, based on art output voltage of the rectification smoothing circuit; and a third series circuit, which is connected in parallel with the second switching element and in which a boost reactor and a direct-current power supply are connected in series. | 11-07-2013 |
20130308346 | ACTIVE AC SNUBBER FOR DIRECT AC/AC POWER CONVERTERS - Active AC snubbers for AC/AC converters are provided. The active snubbers are actively-controlled AC snubbers that may be used in AC/AC power converters including direct AC converters. The active snubbers provide a free-wheeling path for AC/AC converters, ensuring that the converters are tolerant of errors in measurements and timings and of faults. The desired safe commutation of the switching devices when accurate measurements of voltage and current polarities become difficult or under fault contingencies when trapped energy needs to be dispatched safely is ensured. In addition, the active AC snubber may provide equal voltage sharing among the series-connected devices and clamp output voltages. | 11-21-2013 |
20130336014 | ELECTRIC POWER CONVERSION CIRCUIT - A DC-DC converter generates PWM signals PWM | 12-19-2013 |
20130336015 | Fluorescent Lamp Power Supply - Various embodiments of a fluorescent lamp power supply are disclosed herein. In one embodiment, a power supply includes a power input connected to a pulse generator. The power supply also includes a filter connected to a variable pulse width output on the pulse generator and to the power input. The filter is adapted to substantially block at least one harmonic frequency component of the variable pulse width output and to substantially pass a fundamental frequency component of the variable pulse width output. The power supply also includes a power output connected to the filter, wherein an amplitude at the power output is related to the pulse width at the variable pulse width output. | 12-19-2013 |
20130343095 | CIRCUITS AND METHODS FOR INCREASING POWER FACTOR OF SWITCH MODE POWER SUPPLY - A switching mode power supply (SMPS) includes a rectifying device configured for converting a periodically varying input AC (alternating current) voltage into a DC (direct current) voltage, and a transformer including a primary winding, a secondary winding, and an auxiliary winding. The primary winding is coupled to the rectifying device. An input capacitor is coupled to the rectifying device and the primary winding of the transformer. A first power switch is coupled to the input capacitor. A control circuit is coupled to the first power switch and is configured to control the first power switch based on a phase or amplitude of the input AC voltage. By controlling the charging and discharging of the input capacitor, power is provided to the primary winding during a longer portion of the AC input voltage cycle, allowing the rectifier device to have a larger conduction angle to increase a power factor (PF). | 12-26-2013 |
20140009970 | Controller for a Power Converter and Method of Operating the Same - A burst mode controller for a power converter and method of operating the same. In one embodiment, the burst mode controller includes a burst mode initiate circuit configured to initiate a burst mode of operation when a signal representing an output voltage of the power converter crosses a first burst threshold level. The burst mode controller also includes a voltage elevate circuit configured to provide a voltage elevate signal to raise the output voltage if a time window expires before the signal representing the output voltage of the power converter crosses a second burst threshold level. | 01-09-2014 |
20140009971 | ELECTRIC POWER CONVERTER - An electric power converter has a switching circuit section, a transformer, a rectifier, and a noise filtering element. The rectifier is connected to a secondary coil of the transformer. A closed circuit where the noise current flows is formed by the secondary coil, the rectifier, and the noise filtering element. The transformer and the noise filtering element are disposed in a position next to each other. The secondary coil and the noise filtering element are electrically connected to each other through a terminal for a coil that is a terminal of the secondary coil and a terminal for a filter that is a terminal of the noise filtering element. The terminal for the coil and the terminal for the filter are disposed in a position between the transformer and the noise filtering element. | 01-09-2014 |
20140056033 | ELECTRONIC APPARATUS AND POWER CONTROLLING METHOD THEREOF - An electronic apparatus and a power controlling method thereof are provided. The electronic apparatus includes a system unit supplied with power to conduct an operation, and a power supply unit including a power control unit controlling output of standby power, and supplying the standby power to the system unit. The power control unit includes a pulse width modulation (PWM) generation unit generating a PWM signal and a first switching unit switched on/off based on an external input signal to selectively supply power to the PWM generation unit. Thus, power consumption of the electronic apparatus in the standby mode is minimized to facilitate conformance with power regulations in accordance with an energy saving policy. | 02-27-2014 |
20140063862 | VARYING SWITCHING FREQUENCY AND PERIOD OF A POWER SUPPLY CONTROLLER - A controller includes a PWM circuit and a timing circuit. The PWM circuit controls a switch in response to a clock signal. A switching period of the clock signal is based on a charging and discharging time of a capacitor included in the timing circuit. Both first and second current sinks discharge the capacitor while the timing circuit is in a normal discharging mode that is when an on time of the switch is less than a threshold time. The second current sink is prevented from discharging the capacitor such that the capacitor is discharged with the first current sink and not the second current sink while the timing circuit is in an alternative discharging mode that is when the on time of the switch exceeds the threshold time. The discharging of the capacitor in the alternative discharging mode increases the switching period of the clock signal. | 03-06-2014 |
20140071715 | DC/DC CONVERTER, CONTROL CIRCUIT AND CONTROL METHOD THEREOF, POWER SUPPLY, POWER ADAPTER AND ELECTRONIC APPARATUS USING THE SAME - A control circuit of a DC/DC converter includes: a pulse modulator configured to generate a pulse signal; and a driver configured to switch a switching transistor based on the pulse signal. The pulse modulator includes an on signal generator to generate an on signal. The on signal generator includes: a bottom detection comparator configured to compare a voltage of one end of an auxiliary winding with a predetermined threshold voltage and generate a bottom detection signal; a first time-out circuit configured to generate a first time-out signal asserted when the bottom detection signal is not asserted; a second time-out circuit configured to generate a second time-out signal asserted when the bottom detection signal is not asserted; and a logic part configured to generate the on signal based on the bottom detection signal, the first time-out signal and the second time-out signal. | 03-13-2014 |
20140078784 | SWITCHING POWER SUPPLY - A switching power supply can reduce conduction noise when frequency spread control is conducted simultaneously with switching frequency reducing control. The switching power supply comprises a frequency controller that controls the switching frequency of the switching element corresponding to a load condition and reduces the switching frequency in a light load period, a frequency spread modulator that modulates the switching frequency with a predetermined frequency spread width, and a frequency skipping controller that controls the frequency controller to skip a fundamental frequency of the switching frequency when the fundamental frequency becomes a predetermined threshold frequency. | 03-20-2014 |
20140078785 | ADAPTER POWER SUPPLY - An adapter power supply of the invention comprises a switching element that performs switching of an input voltage obtained by rectifying an input AC voltage to deliver switched voltage to a primary winding of an isolating transformer, a diode that rectifies a voltage obtained across a secondary winding of the isolating transformer to obtain a DC output voltage, and a thermoelectric conversion element that performs thermoelectric conversion to variably set the DC output voltage corresponding to a temperature difference between a heated temperature of the switching element or the diode and an atmospheric temperature. The thermoelectric conversion element is disposed between a heat sink attached to the switching element or the diode and a package for containing a main body of the adapter power supply. | 03-20-2014 |
20140078786 | Power Supply Circuit - This power supply circuit includes a comparison portion configured to compare the value of a voltage based on a voltage input to a primary winding of a transformer with the value of a voltage based on the full-wave rectified voltage of an alternating current source, a load circuit supplied with power output from the secondary side of the transformer, and a stop portion configured to stop power supply to the load circuit. | 03-20-2014 |
20140085938 | PRIMARY FEEDBACK SWITCHING POWER CONVERTER CONTROLLER WITH INTELLIGENT DETERMINATION OF AND RESPONSE TO OUTPUT VOLTAGE DROPS DUE TO DYNAMIC LOAD CONDITIONS - The embodiments herein include a primary-side controller for a switching power converter that is capable of receiving a detection signal from a secondary-side detection circuit indicating that an output voltage has reached a condition. The controller determines the appropriate action once a detection signal has been received by distinguishing whether a dynamic load condition has been placed on the power supply versus other operating conditions. | 03-27-2014 |
20140092641 | SYNCHRONOUS RECTIFYING BUCK-BOOST CONVERTER - A synchronous rectifying buck-boost converter includes a controller, first and second transistors, an inductor and a capacitor. The controller is connected to the gates of the first and second transistors for controlling ON/OFF of the first and second transistors, and further controls the current of the inductor and charge/discharge of the capacitor. The first and second transistors connected in series are connected to the controller and the inductor. The inductor is connected to a first external power unit or a first external loading device. The drain of the first transistor is connected to a second external power unit or a second external loading device such that a low-voltage input power of the first external power unit is converted to a high-voltage output power or a high-voltage input power of the second external power unit is converted to a low-voltage output power. | 04-03-2014 |
20140104892 | FM/PWM HIGH SPEED CONTROLLER FOR RESONANT TYPE SWITCHING MODE POWER SUPPLY - This invention provides a high speed controller and switching mode power supply. The high speed controller includes PWM control chip, providing high speed PWM function; output circuit: sending out PWM working signal or frequency modulation working signal. FM enhancement network: inducing feedback signals from CFB and VFB circuitry to vary the oscillation frequency of the PWM control chip, and boost up the frequency modulation function. The FM enhancement network is an unique circuitry to alter the operation characteristics of the PWM control chip. In this respect the high speed controller can be regarded as a new PWM/FM controller which can work simultaneously both in PWM mode and in FM mode in accordance to the load conditions of DC/DC converter output. The efficiency of medium to high power supply using the new design as controller IC would increase at least 5% to 8% higher than other power supplies. | 04-17-2014 |
20140133188 | SNUBBER CIRCUIT - A snubber circuit of a switching power supply device includes a transistor and a capacitor which are connected in series between a cathode and an anode of a diode, and a secondary winding of a transformer. A vibration voltage is generated in the secondary winding when a surge voltage is generated in the diode. The snubber circuit further includes a differentiating circuit which differentiates a voltage between terminals of the secondary winding, and a peak charging circuit which generates a control voltage of a waveform connecting a plurality of peaks of an output voltage of the differentiating circuit and applies the control voltage to a gate of the transistor to cause the transistor conduct. | 05-15-2014 |
20140153291 | DUAL-MODE, AC/DC POWER CONVERTER WITH POWER FACTOR CORRECTION - A dual-mode circuit for the control of an AC/DC power converter is disclosed. An example dual-mode controller circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a critical conducting mode (CrM) module as well as a discontinuous conducting mode (DCM) module configured to generate waveforms adapted for CrM and DCM operation of a power converter. The circuit includes a node for receiving a feedback signal of a voltage or a current. Based on the received signal, one of the modules is selected at a time to supply the waveform at the output of the dual-mode controller. An example of the output waveform is a series of pulses that are configured to drive the switch that controls the transfer of power between input and output of the power converter. | 06-05-2014 |
20140153292 | PRIMARY SIDE SENSE OUTPUT CURRENT REGULATION - The embodiments disclosed herein describe a method of a controller to maintain a substantially constant average output current at the output of a switching power converter. In one embodiment, the controller uses a regulation voltage that corresponds to the primary peak current regulation level to regulate the average output current. | 06-05-2014 |
20140160801 | HIGH POWER FACTOR PRIMARY REGULATED OFFLINE LED DRIVER - A fly-back type switched current regulator includes a primary transformer winding coupled to receive a rectified DC signal derived from an AC signal. The drain of a power transistor is coupled to the primary winding, with the source of the power transistor coupled to an input of a comparison circuit and a primary transformer winding sense resistor. A control terminal of the power transistor is coupled to an output of the comparison circuit. A capacitor stores a variable reference signal for application at a first capacitor terminal to another input of the differential circuit. The variable reference signal is compared to a winding current signal generated by the sense resistor by the comparison circuit. An injection circuit applies an AC signal derived from the rectified DC signal to a second terminal of the capacitor so as to modulate the stored variable reference signal. The regulator is coupled to drive LEDs. | 06-12-2014 |
20140160802 | FAULT PROTECTION AND CORRECTION OF LINE AND LOAD FAULTS - A fault protection and correction circuit for the control of a power converter is disclosed. An example circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a first and a second shut down mode modules, both of them cause the switching to stop. The circuit includes a module for receiving fault events. When a fault occurs, the controller enters the second shut down mode. The controller stays in the second shut down mode if the required current for this mode can be provided by the outside circuitry. Otherwise, the controller enters the first shut down mode that requires less current and subsequently restarts the controller. By modifying the outside circuitry the controller can respond differently to fault events. | 06-12-2014 |
20140160803 | DC/DC CONVERTER - A ZT comparator is configured to compare a voltage V | 06-12-2014 |
20140160804 | DC/DC CONVERTER - An external resistor is connected to a detection terminal. A pulse modulator is configured to generate a pulse signal S | 06-12-2014 |
20140169040 | MULTILEVEL CONVERTER - A power converter is presented. The power converter includes at least one leg operatively coupled between a first bus and a second bus and includes a first string including a plurality of non-controllable semiconductor switches, a first node, a second node, and a third node, where the first node is coupled to a third bus, one or more second strings, where each of the one or more second strings includes at least one fully controllable semiconductor switch, and where one of the second strings is coupled between the first node and the third bus and another second string is coupled between the second node and the third node, and one or more third strings, where each of the one or more third strings includes at least one energy storage device and is coupled to the first string, the one or more second strings, or a combination thereof. | 06-19-2014 |
20140177286 | QUASI-RESONANT SWITCHING POWER SUPPLY - A quasi-resonance switching power supply quickly determines the number of bottom skips corresponding to the load condition even in abrupt load change. The quasi-resonance switching power supply is provided with a bottom skipping control function and a capacitor to hold a voltage corresponding to the load condition of the switching element over one switching period of the switching element. The quasi-resonance switching power supply comprises a bottom skipping number determining circuit that compares the voltage held on the capacitor with comparison reference voltages selected from a plurality of reference voltages for determining the number of bottom skips, and revises the comparison reference voltage according to the comparison result. The processing of comparison and revision is executed multiple times in one switching period of the switching element. Thus, the bottom skipping number determining circuit determines the number of bottom skips corresponding to the voltage held on the capacitor. | 06-26-2014 |
20140204619 | ENERGY CONVERSION ARCHITECTURE WITH SECONDARY SIDE CONTROL DELIVERED ACROSS TRANSFORMER ELEMENT - A switched mode power converter is configured having predominate secondary side control. A primary side driving circuit is configured as a responsive state machine the output of which is input as the driving signal for a main switch. An output voltage, current or power is sensed and the secondary side controller compares the sensed output characteristic with a predefined reference. The comparison results in an error that signifies an amount that the output is out of regulation. The secondary side controller drives a secondary side switch to generate a voltage pulse across the secondary winding. The voltage pulse has a pulse width that represents the amount of error in the output characteristic. The voltage pulse is transmitted across the transformer and received by the primary side driving circuit, which generates a driving signal modulated according to the voltage pulse and drives the main switch to regulate the output characteristic. | 07-24-2014 |
20140204620 | Converter - A converter for transferring energy from a voltage supply to an output includes transformer T | 07-24-2014 |
20140204621 | APPARATUS FOR REGULATING AN ENERGY SYSTEM AND METHOD FOR OPERATING AN ENERGY SYSTEM - The present invention provides compensation of rapid fluctuations in voltage in a DC-to-DC converter. For this, the primary side of the DC-to-DC converter is monitored by means of capacitive voltage dividers. A voltage fluctuation occurring in the process can be identified early and thereupon the DC-to-DC converter can be controlled correspondingly to counteract this. | 07-24-2014 |
20140211514 | LOW POWER CONVERTER - An AC to DC converter system is disclosed in which a conversion circuit for converting an AC input signal to a DC output signal is operably coupled with an enabling circuit designed for sensing and output parameter indicative of the presence or absence of a load at the DC output. The system is designed so that the conversion circuit operates in an inactive standby state when there is no load, and in an active state for supplying DC power when a load is present. The enabling circuit is configured to operate using low power. | 07-31-2014 |
20140218974 | USB POWER ADAPTER FOR AC AND DC POWER - A USB power adapter for AC and DC power has a circuit board, a base and a top cover. The base and the top cover receive the circuit board therein. The circuit board has an AC conversion module, a DC conversion module, and a USB connection port. The base has a cigarette lighter electrically connected to the DC conversion module. The top cover has a pair of blades electrically connected to the AC conversion module. The AC power inputted through the pair of blades is converted by the AC conversion and the DC conversion module into the power outputted through the USB connection port. Accordingly, it is unnecessary to prepare a dedicated AC or DC charger depending upon the type of power source or to prepare a charger requiring many replaceable plugs. The inconvenience caused by carrying and operating those chargers or plugs can be resolved. | 08-07-2014 |
20140218975 | POWER CONVERSION SYSTEM WITH ADJUSTABLE FREQUENCY - A power conversion system with adjustable frequency includes an electric transformer, a pulse width modulation driving controller, a switching transistor, a first and second voltage division resistors connected in series, an output diode and an output capacitor. The electric transformer receives the input power and generates the sensing current and induced current. The sensing current flows through the first and second voltage division resistors to generate the feedback signal. The induced current flows through the output diode and output capacitor to generate the output voltage to supply the load. The pulse width modulation driving controller determine whether the loading state of the load based on the feedback signal, and change the switching frequency according to the loading state and the input power, thereby increasing the whole efficiency of the power conversion system and achieving the aim of dynamically adjusting the optimal frequency. | 08-07-2014 |
20140218976 | SYSTEMS AND METHODS FOR REGULATING POWER CONVERSION SYSTEMS WITH OUTPUT DETECTION AND SYNCHRONIZED RECTIFYING MECHANISMS - System and method for regulating a power conversion system. An example system controller includes: a first controller terminal and a second controller terminal. The system controller is configured to: receive an input signal at the first controller terminal and generate a first drive signal at the second controller terminal based on at least information associated with the input signal to turn on or off a transistor to affect a current associated with a secondary winding of the power conversion system. The system controller is further configured to: in response to the input signal changing from a first value larger than a first threshold to a second value smaller than the first threshold, change the first drive signal from a first logic level to a second logic level to turn on the transistor. | 08-07-2014 |
20140233266 | POWER SUPPLY SYSTEM, IMAGE FORMING APPARATUS HAVING THE POWER SUPPLY SYSTEM, AND CONTROL METHOD OF THE POWER SUPPLY SYSTEM - A power supply system includes: a switching power supply for converting an AC voltage from an AC power supply into a DC voltage; a latching relay provided on an AC input line for switching a connection state of the switching power supply with the AC power supply in response to a relay drive signal; a control device for generating a relay control signal; a relay drive circuit for generating the relay drive signal in response to an input of the relay control signal and driving the latching relay by the relay drive signal; a battery for supplying electric power to the control device and the relay drive circuit when they are connected; and a switch for switching the connection state of the battery with respect to the control device and the relay drive circuit. | 08-21-2014 |
20140241013 | LOAD DRIVER - A load driver includes: a rectifying unit configured to rectify an AC voltage from a power source to generate a first voltage; a first converter configured to convert the first voltage outputted from the rectifying unit into a second voltage; a second converter configured to drive a load with a constant current, based on the second voltage converted by the first converter; and a feedback unit configured to generate feedback information, based on information obtained from the second converter and indicating an output voltage when the second converter drives the load with the constant current, wherein the first converter converts the first voltage into the second voltage having a magnitude based on the feedback information obtained from the feedback unit. | 08-28-2014 |
20140254206 | REVERSE CURRENT CONTROL FOR AN ISOLATED POWER SUPPLY HAVING SYNCHRONOUS RECTIFIERS - In certain example embodiments, a system is provided that includes a circuit. The system also includes a reverse current control module that provides an isolated power supply in order to protect one or more devices in a power chain during one or more testing activities having one or more requirements. | 09-11-2014 |
20140254207 | SWITCHING POWER SUPPLY DEVICE - In a switching power supply device, a voltage of a counter electromotive force induced in a drive winding as a high side switching element is turned off is output to a ZT terminal of a switching control IC, and thus an OUT terminal of the switching control IC is brought to a high level, and thus a low side switching element is turned on. A constant current circuit charges a capacitor with a constant current through a voltage at the OUT terminal. A comparator in the switching control IC inverts the voltage at the OUT terminal to a low level upon a voltage at an IS terminal exceeding a voltage at an FB terminal. Thus, an on time of the low side switching element is controlled in accordance with a voltage output to the FB terminal, and an output voltage Vo is turned into a constant voltage. | 09-11-2014 |
20140268901 | POWER MANAGEMENT INTEGRATED CIRCUIT PARTITIONING - A switched mode power converter includes a feedback mechanism by which a coded train of pulses with well defined integrity is generated on a secondary side of the power converter and transmitted to the primary side for decoding and application by a waveform analyzer to regulate the power converter output. The pulse train is modulated by a secondary side controller and transmitted across an isolation galvanic barrier. The main transformer is used as the signal transmitter from the secondary side to the primary side of the power converter. The coded pulse train is recognized by a controller on the primary side and translated into a regulating driving signal for a main switching element. The transmitted coded pulse train can be embedded with very high frequency modulation that allows the isolation galvanic barrier to act as a capacitive signal transmitter. | 09-18-2014 |
20140293657 | INTEGRATED CONVERTER WITH SINGLE-ENDED CONTROL, POWER FACTOR CORRECTION, AND LOW OUTPUT RIPPLE - An integrated converter with single-ended control and power factor correction includes an input unit, a boost inductor, a voltage regulator, an energy-storing capacitor, a buck-boost converter, a single-ended switch and a control unit. The voltage regulator and the buck-boost converter share the single-ended switch and the control unit in order to correct power factor, reduce output ripple, simplify the complexity of circuit and decrease the number of components. The voltage regulator is utilized in reducing the frequency of switching and the conductive losses, thus improving overall performance. With the magnetic loop, the transformers of the boost inductor and the voltage regulator can be merged, and thus the efficiency of the whole spatial usage is increased and the noise interference is reduced. | 10-02-2014 |
20140313785 | COMPOSITE ELECTRONIC COMPONENT, BOARD HAVING THE SAME MOUNTED THEREON AND POWER STABILIZING UNIT INCLUDING THE SAME - A composite electronic component includes a first power stablizing unit and a second power stabilizing unit. The first power stabilizing unit includes a first input terminal receiving first power supplied from a battery, stabilizing the first power, and supplying the stabilized first power to a power managing unit. The second power stabilizing unit includes a second input terminal receiving second power converted by the power managing unit and an output terminal stabilizing the second power and supplying the stabilized second power as driving power. The first and second power stabilizing units include a capacitor and an inductor to stabilize the powers. The inductor is configured to suppress an alternating current (AC) component of the received power. The capacitor is configured to decrease ripple of the received power. | 10-23-2014 |
20140313786 | CONTROLLING CIRCUIT AND AC/DC CONVERTER THEREOF - In one embodiment, a controlling circuit configured for an AC/DC converter that receives an AC voltage supply, can include: (i) a compensation signal generator configured to generate a compensation signal that follows an error between an output signal from the AC/DC converter and an expected converter output signal during a first time interval of a half period of the AC voltage supply, the compensation signal being substantially constant during a remaining time interval of the half period; and (ii) a controlling signal generator configured to generate a controlling signal based on the compensation signal to maintain the output signal as substantially consistent with the expected converter output signal. | 10-23-2014 |
20140313787 | SWITCHING POWER SUPPLY APPARATUS - A switching power supply apparatus, including a power converting device body configured to switch DC input power through a first switching element to thereby store the DC input power in an inductor, and to transfer the stored power to an output capacitor through a second switching element by use of resonance of the inductor, a control circuit configured to drive the first and second switching elements to alternately turn ON or OFF the two switching elements, to thereby resonate the inductor, and an overload detecting circuit configured to detect a load state of the power converting device body based on a peak value or an effective value of a resonance voltage generated from the resonance of the inductor, to thereby control operation of the control circuit. | 10-23-2014 |
20140313788 | POWER SUPPLY DEVICE - A power supply device includes a substrate, a transformer, a rectifying section, a filtering section, at least one first capacitor section, and a second capacitor section. The substrate includes at least one semiconductor element. The transformer inputs an electric power via at least one pair of primary-side terminals, transforms the input electric power, and outputs the transformed electric power via at least one pair of secondary-side terminals. The rectifying section includes at least one rectifying element configured to rectify the transformed electric power. The filtering section reduces alternating-current components included in the rectified electric power. The first capacitor section is connected in parallel to the at least one rectifying element. The second capacitor section generates one or more harmonic waves that reduce a peak value of a fundamental wave of resonance generated based on a leakage inductance component of the transformer and a capacitance component of the first capacitor section. | 10-23-2014 |
20140313789 | DISTRIBUTED CONTROLLERS FOR A POWER ELECTRONICS CONVERTER - A distributed controller module for controlling a power electronics building block of a power electronics converter includes a plurality of gate drivers for controlling power electronics switches of the power electronics building block, a first fiber optics communication interface for communication with a central controller module, a second fiber optics communication interface for communication with a second distributed controller module for controlling a second power electronics building block of the power electronics converter, and a processor unit for controlling the gate drivers and transmitting and receiving data via the first fiber optics communication interface and the second fiber optics communication interface. | 10-23-2014 |
20140328087 | Apparatus and Method for Implementing a Multiple Function Pin in a BCM Power Supply - An apparatus and a method for implementing a multiple function pin in a boundary conduction mode power supply, uses a same pin to switch a power switch and to achieve zero current detection to reduce pin count and save cost of a control integrated circuit. A first voltage is applied to the multiple function pin to turn on the power switch, and then a second voltage is applied to the multiple function pin after the power switch has been turned on for a first time, to thereby turn off the power switch. After the power switch has been turned off for a second time, a third voltage is applied to the multiple function pin keep the power switch off. Preferably, a tristate output driver is used to provide the first and second voltages, and a clamping circuit is used to provide the third voltage. | 11-06-2014 |
20140334192 | PIEZOELECTRIC POWER CONVERTER WITH BI-DIRECTIONAL POWER TRANSFER - The present invention relates to a bi-directional piezoelectric power converter comprising a piezoelectric transformer. The piezoelectric transformer comprises an input electrode electrically coupled to a primary section of the piezoelectric transformer and an output electrode electrically coupled to an output section of the piezoelectric transformer to provide a transformer output signal. A bi-directional switching circuit is coupled between the output electrode and a DC or AC output voltage of the power converter. Forward and reverse current conducting periods of the bi-directional switching circuit is based on the input drive signal or the transformer output signal such that a forward current is conducted from the output electrode through the bi-directional switching circuit to the DC or AC output voltage in a first state to charge the DC or AC output voltage. In a second state, a reverse current is conducted through the bi-directional switching circuit from the DC or AC output voltage to the output electrode to discharge the DC or AC output voltage and return power to the primary section of the piezoelectric transformer. | 11-13-2014 |
20140334193 | SELF-OSCILLATING LOOP BASED PIEZOELECTRIC POWER CONVERTER - The present invention relates to a piezoelectric power converter comprising an input driver electrically coupled directly to an input or primary electrode of the piezoelectric transformer without any intervening series or parallel inductor. A feedback loop is operatively coupled between an output voltage of the piezoelectric transformer and the input driver to provide a self-oscillation loop around a primary section of the piezoelectric transformer oscillating at an excitation frequency. Electrical characteristics of the feedback loop are configured to set the excitation frequency of the self-oscillation loop within a zero-voltage-switching (ZVS) operation range of the piezoelectric transformer. | 11-13-2014 |
20140340941 | DROOP CURRENT SHARING POWER CONVERTER WITH CONTROLLED TRANSITIONS BETWEEN REGULATION SET POINTS - A regulated switching power converter generates a converter output having first and second regulated output values under corresponding operating conditions. The converter output transitions between the first and second output values in response to transition of a trigger signal in a transition window between first and second trigger values. A transition step function is based on transition amplitude, transition interval and number of steps, the transition amplitude being a difference between the first and second regulated output values, and the transition interval being a difference between the first and second trigger values. The transition step function generates a step-like transition signal based on values of the trigger signal between the first and second trigger values. During operation in the transition window, the step-like transition signal is included in the regulation reference value to generate a step-like transition of the converter output between the first and second regulated output values. | 11-20-2014 |
20140355314 | STORAGE TIME CONTROL - We describe a method of controlling turn off time delay of a switching device of a switch mode power converter (SMPC). The SMPC has an inductive component comprising an input winding coupled to receive power from an input; and a switching device to, when on, conduct input winding current. In embodiments the method comprises applying turn on and turn-off signals to the switching device; applying at least one turn off signal, to initiate turning off of the switching device, and detecting a sensing signal from a further winding of the inductive component, inductively coupled to the input winding, to thereby indicate an end of a turn off time delay or duration. The method controls the turn on signal for a subsequent switching cycle of the SMPC device to regulate the turn off delay time. | 12-04-2014 |
20140362608 | METHOD FOR PROGRAMMABLE PRIMARY-SIDE-REGULATED POWER CONVERTER - The invention discloses a method for controlling a programmable primary-side-regulated power converter. The method includes the following steps. A light load situation is enabled for a first time period at a secondary side of a transformer. A transmit-code is generated at the secondary side of the transformer. A current pulse signal is generated at the secondary side of the transformer according to the transmit-code after the first time period. The light load situation is detected at a primary side of the transformer for the first time period. A current signal is detected by detecting a primary side switching current of the transformer. A receive-code is generated according to the current signal. An output current and/or an output voltage of the power converter is generated in accordance with the receive-code. The transmit-code and the receive-code are correlated. The current pulse signal and the current signal are correlated. | 12-11-2014 |
20140376271 | Switching Power-Supply Device - A switching power-supply device, includes a first terminal; a first winding connected to the first terminal; a second winding, which is connected in series to the first winding and is magnetically coupled to the first winding; a first capacitor connected in series to the second winding; a transformer including a primary winding connected in series to the first capacitor and a secondary winding magnetically coupled to the primary winding; a rectifying-and-smoothing circuit connected to the secondary winding; a second terminal, which is connected to an opposite end of the primary winding opposite to a connection end connecting to the first capacitor; a first switching element, which is connected between a connection point of the first winding and the second winding and the second terminal; and a control circuit, which controls first switching element to turn on-and-off. | 12-25-2014 |
20150023064 | METHOD OF FORMING A POWER SUPPLY CONTROLLER AND STRUCTURE THEREFOR - In one embodiment, a method of forming a power supply controller includes forming the power supply controller to receive an input signal that is representative of an ac signal, and forming the power supply controller to form an average value of an output current over a period of a drive signal that is formed by the power supply controller to have a waveshape of substantially one of a squared version of the input signal or a waveshape of the input signal. | 01-22-2015 |
20150023065 | VOLTAGE GENERATING APPARATUS AND IMAGE FORMING APPARATUS INCLUDING THE SAME - Until an output voltage of a converter reaches a threshold value, a control part performs switching control, and after the output voltage reaches the threshold value, the control part performs supply voltage control while the state of a switching control signal at the time when the output voltage reaches the threshold value is maintained. Switching control is a control method in which the output voltage is adjusted by adjusting the frequency or duty ratio of the switching control signal that drives a driving part. Supply voltage control is a control method in which the output voltage is adjusted by adjusting the supply voltage that is applied to the primary side of the converter. | 01-22-2015 |
20150062972 | SYNCHRONOUS RECTIFIER CONTROL CIRCUITS OF POWER CONVERTERS - A synchronous rectifying control circuit of a power converter is provided. The synchronous rectifying control circuit comprises a synchronous rectifying driver, a charge pump capacitor, and a capacitor. The synchronous rectifying driver is coupled to a transformer for generating a control signal to switch a transistor. The charge pump capacitor is coupled to a power source for generating a charge pump voltage. The capacitor is coupled to store the charge pump voltage. The transistor is coupled to the transformer and operated as a synchronous rectifier. The charge pump voltage is coupled to guarantee a sufficient driving capability for the control signal. | 03-05-2015 |
20150070942 | DC-DC CONVERTER - A DC-DC converter includes a coupling transformer that has windings | 03-12-2015 |
20150078037 | POWER CONTROL DEVICE FOR DYNAMICALLY ADJUSTING FREQUENCY - A power control device for dynamically adjusting frequency includes an electric transformer, a controller, a loading feedback unit, and a switching transistor. The electric transformer includes a first side induction coil connected to an input power unit, a second side induction coil connected to a loading unit to generate an output power by electromagnetic induction with the first side induction coil, and an auxiliary induction coil generating a power sensing signal by electromagnetic induction with the first side induction coil. The loading feedback unit generates a loading feedback signal. The controller determines the level of loading based on the loading feedback signal and further detects the valleys of the power sensing signal so as to change the switching signal which controls the switching transistor at the optimal one of the valleys. | 03-19-2015 |
20150078038 | COMPOUND SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD OF THE SAME - An AlGaN/GaN.HEMT includes, a compound semiconductor lamination structure; a p-type semiconductor layer formed on the compound semiconductor lamination structure; and a gate electrode formed on the p-type semiconductor layer, in which Mg being an inert element of p-GaN is introduced into both sides of the gate electrode at the p-type semiconductor layer, and introduced portions of Mg are inactivated. | 03-19-2015 |
20150085534 | REGENERATIVE AND RAMPING ACCELERATION (RARA) SNUBBERS FOR ISOLATED AND TAPPED-INDUCTOR CONVERTERS - A voltage converter circuit comprising a primary inductor; a secondary inductor, at least a portion of the second inductor being mutually coupled to the primary inductor; a rectifier diode connected to the secondary inductor such that the rectifier diode turns off when current flows in the secondary inductor in a first direction; and a snubber circuit arranged to charge a first snubber capacitor with the current flowing through the secondary inductor after the rectifier diode turns off; the snubber circuit being arranged to discharge the first snubber capacitor by complementing the current in the secondary inductor after the flow of the current in the secondary inductor is inverted. | 03-26-2015 |
20150098252 | METHOD AND APPARATUS FOR TRANSFERRING ELECTRICAL POWER BY MEANS OF CAPACITIVE COUPLING - A method and an apparatus for transferring electric power to an electrical load ( | 04-09-2015 |
20150098253 | POWER SUPPLY APPARATUS - A second control circuit is configured to switch a pulse signal to a level which turns off a second switching transistor when a coil current that flows through a primary winding reaches a predetermined threshold current. The second control circuit is configured to start a switching operation when a power supply for an electronic device is turned on, to set the threshold current to a first value when an intermediate voltage is higher than a predetermined level, and to set the threshold current to a second value that is lower than the first value when the intermediate voltage is lower than a predetermined level. A first control circuit is configured to start a switching operation upon receiving an instruction from a microcontroller to start operating. | 04-09-2015 |
20150117065 | GATE DRIVING CIRCUIT, AND SWITCHING APPARATUS AND POWER SUPPLY APPARATUS HAVING THE SAME - A gate driving circuit may include: a bias unit receiving an input signal having preset high and low signal levels, including a first N-MOSFET turned on in the case in which the input signal has the high level and a first P-MOSFET turned on in the case in which the input signal has the low level, and supplying bias powers by the turning-on of the first N-MOSFET and the first P-MOSFET; and an amplifying unit including a second N-MOSFET turned on by receiving the bias power supplied from the first N-MOSFET in the case in which the input signal has the high level and a second P-MOSFET turned on by receiving the bias power supplied from the first P-MOSFET turned on in the case in which the input signal has the low level and providing a gate signal depending on the turning-on of the second N-MOSFET and the second P-MOSFET. | 04-30-2015 |
20150117066 | SWITCHED MODE CONVERTER AND METHODS OF CONTROLLING SWITCHED MODE CONVERTERS - A method is disclosed of controlling a switched mode converter comprising a switch and for providing power to device having a load, comprising: in response to the load exceeding a first threshold, operating in a first mode, being a CCM; in response to the load exceeding a second threshold and not exceeding the first threshold, operating in second mode, being a BCM without valley skipping wherein the switching frequency increases with decreasing load; in response to the load exceeding a third threshold and not exceeding the second threshold, operating in a third mode, being a BCM with valley skipping, wherein the switching frequency depends on the load and the number of valleys skipped and is between a fixed upper and a lower switching frequency limit; and in response to the load not exceeding the third threshold, operating in a fourth mode, being a BCM with valley skipping, wherein the switching frequency depends on at least the load, and is between an upper and a lower switching frequency limit wherein the upper switching frequency limit decreases with decreasing load. A switched mode converter controlled by such a method is also disclosed. | 04-30-2015 |
20150124491 | Power Controllers and Control Methods Thereof for Switching Mode Power Supplies - Herein is disclosed a control method suitable for a switching mode power supply. A power switch is controlled according to a clock signal to transfer electrical energy from an input power source to an output power source. A feedback signal is provided in response to an output voltage of the output power source. A clock signal is generated in response to the feedback signal and an input voltage of the input power source. The clock signal has a clock frequency determining a switching frequency of the power switch. When the feedback signal exceeds a relatively-high level, the clock frequency increases in response to decrease to the input voltage. When the feedback signal is below a relatively low level, the clock frequency is independent from the input voltage. | 05-07-2015 |
20150131331 | APPARATUS AND METHOD FOR SUPPLYING POWER - Disclosed is an apparatus for supplying power to a device. The apparatus includes a transformer configured to output a predetermined voltage to a device varying in load; a switch configured to switch on and off the voltage output from the transformer in accordance with pulse width modulation (PWM) signals; a PWM signal supplier configured to supply the PWM signal to the switch; a feedback circuit which detects the output from the transformer and applies a control signal to the PWM signal supplier; and an output voltage controller which detects a load current of the device, and adjusts the control signal of the feedback circuit by adjusting the output detected by the feedback circuit in accordance with the detected load current. | 05-14-2015 |
20150131332 | ELECTRONIC APPARATUS AND POWER CONTROLLING METHOD THEREOF - Disclosed are an electronic apparatus and a power controlling method thereof, the electronic apparatus including a system portion configured to operate with a received voltage, and a power supply including a pulse width modulation (PWM) generator to generate a PWM signal, a converter to transfer voltage from a primary side to a secondary side in accordance with an output voltage of the PWM generator, and an output portion to supply voltage at the secondary side as standby voltage to the system portion, the PWM generator receives feedback on the standby voltage at the secondary side of the converter, the PWM signal is turned on/off in accordance with levels of the standby voltage at the secondary side, and voltage being supplied to components, except, when the PWM signal is turned off, voltage at the secondary side is only supplied to a component that monitors the feedback of the standby voltage. | 05-14-2015 |
20150131333 | DC-DC CONVERTER WITH MULTIPLE OUTPUTS - A multiple output DC-DC converter comprises a transformer, a primary circuit, a plurality of secondary circuits, and a controller. The transformer has a primary and at least one secondary winding. The primary circuit connects to a DC power supply source and includes the primary winding of the transformer and a primary switch connected in series. The plurality of secondary circuits includes the at least one secondary winding of the transformer, wherein each secondary circuit provides a DC power supply output, and at least one of the secondary circuits has a secondary switch. The controller monitors an output signal of each secondary circuit and controls operation of the primary and secondary switches based on the monitored signals. The controller co-ordinates operation of the secondary switch with the primary switch, such that the primary switch and the secondary switch are switched on simultaneously, or with a controlled offset. | 05-14-2015 |
20150131334 | SWITCHING POWER SUPPLY APPARATUS AND SEMICONDUCTOR DEVICE - Provided is a switching power supply apparatus that shifts to an OFF mode when electronic equipment is on standby, and includes: an OFF mode delay circuit that delays shifting to the OFF mode; and an electric storage unit and a power supply circuit that function as a power supply source of an OFF mode control circuit. With the configuration, the power consumption can almost be eliminated, and the switching power supply apparatus can start without any charge in an electricity storage component such as a primary battery or a secondary battery. | 05-14-2015 |
20150131335 | POWER SUPPLY CIRCUIT, ELECTRONIC PROCESSING APPARATUS, AND POWER SUPPLY METHOD - A power supply circuit includes: an environment detecting circuit which detects an installation environment; and a voltage control circuit which makes a report of a power supply capability by performing fluctuation control of an output voltage in response to detection information of the environment detecting circuit. | 05-14-2015 |
20150138842 | METHOD FOR CONTROLLING A POWER SOURCE, AND POWER SOURCE AND PROCESS CONTROLLER THEREFOR - A method for controlling a power source is specified. The power source comprises a first converter ( | 05-21-2015 |
20150138843 | ELECTRIC-POWER CONVERSION DEVICE - A DC/DC conversion circuit is configured with a first power converter and a second power converter that are connected through an insulation transformer, and performs power transition bidirectionally between two DC-voltage sources. In the case of charging the DC-voltage source in the side where the second power converter is placed, a control is made using a first rectifier-control mode in which the first power converter is placed under an output variable control according to an inverter operation and the second power converter is operated according to a rectifier operation. Then, when a charging current becomes an upper limit value or more, a control is made by switching the mode to a first inverter-control mode in which the first power converter is placed under an output fixed control according to the inverter operation and the second power converter is placed under an output variable control according to the inverter operation. | 05-21-2015 |
20150295498 | POWER CONVERTERS - A power converter arrangement is described. The power converter includes a dc link and a power converter. The dc link is operably connected between a generator, or other power source, that provides an output voltage in use and a dc network. The power converter includes an inverter connected across the dc link in parallel with the generator, an isolation transformer having a primary tap changer and a secondary tap changer, and a rectifier. The rectifier has ac terminals connected to the secondary tap changer, a first dc terminal connected to the dc link, and a second dc terminal connected to the dc network. The dc terminal voltage of the rectifier is therefore summated with the output voltage of the generator to provide a converter output voltage. | 10-15-2015 |
20150311805 | POWER SUPPLY DEVICE, IMAGE FORMING APPARATUS, LASER DEVICE, LASER IGNITION DEVICE, AND ELECTRONIC DEVICE - A power supply device includes a power converter transformer, a coil, a first capacitor, and an energy regeneration circuit. The power converter transformer includes a primary winding and a secondary winding. The coil is provided on a primary side of the power converter transformer, and has a first end connected in series to a first end of the primary winding of the power converter transformer to store energy. The stored energy is regenerated in the first capacitor provided on the primary side of the power converter transformer by the energy regeneration circuit provided on the primary side of the power converter transformer. | 10-29-2015 |
20150311815 | HERMETIC HIGH CURRENT SOLID STATE POWER CONTROLLER - A solid state power controller (SSPC) includes a support structure, and a first solid state power switch die arranged relative to the support structure, the solid state power switch die including a solid state power switch having an input terminal for connecting to a power source and an output terminal for providing power to an electrical component. A first gate driver is electrically coupled to the first solid state power switch die, and a control module is operatively coupled to the first gate driver. A hermetic enclosure surrounds at least the first solid state power switch die. | 10-29-2015 |
20150318788 | GATE DRIVE POWER SUPPLY FOR MULTILEVEL CONVERTER - A neutral point clamped, multilevel level converter including a DC voltage link having a positive rail and a negative rail; a phase leg coupled to an AC node, the phase leg having a first switch and a second switch in series between the negative rail and the AC node, the phase leg having a third switch and a fourth switch in series between the positive rail and the AC node; and a gate drive power supply having a charge pump section, the charge pump section generating a first gate drive voltage for the first switch and a second gate drive voltage for the second switch. | 11-05-2015 |
20150326104 | Power Supply Bus Circuit - A power supply bus circuit, includes a voltage regulator circuit, and an impedance isolation circuit, and further including one or more voltage adjustment circuits, where the voltage regulator circuit receives a direct current signal, adjusts a voltage of the direct current signal to a first preset voltage, and outputs a direct current signal of the first preset voltage to the impedance isolation circuit; the impedance isolation circuit receives the direct current signal of the first preset voltage, adjusts the direct current signal of the first preset voltage to an alternating current signal, and outputs, by using a transformer, the alternating current signal in an isolated way and converts the alternating current signal that is output in an isolated way to an isolated direct current signal, and outputs the isolated direct current signal to the voltage adjustment circuit. | 11-12-2015 |
20150333631 | POWER SUPPLY APPARATUS WITH INPUT VOLTAGE DETECTION AND METHOD OF OPERATING THE SAME - A power supply apparatus with input voltage detection includes a power input side and an input detection module. The power input side has a first input terminal and a second input terminal, and the first input terminal and the second input terminal are electrically connected to a live wire and a neutral wire of an AC power source, respectively. The input detection module has two input terminals, which are corresponding electrically connected to the first input terminal and the second input terminal. The input detection module generates a detection signal to shut down the power supply apparatus when the input detection module detects that the live wire or the neutral wire is abnormal, or the live wire and the neutral wire are both abnormal. | 11-19-2015 |
20150333637 | AC-DC BI-DIRECTIONALLY CONVERSION DEVICE WITH FAILURE DETERMINATION FUNCTION, FAILURE DETERMINATION METHOD AND COMPUTER READABLE MEDIUM - Provided is a conversion device which can determine the presence/absence of a failure in a detection unit for detecting AC or DC voltage or current. | 11-19-2015 |
20150349646 | A Control Circuit and a Method for an Energy Based Pulse Skipping Mode in a DC/DC Converter - A control circuit for a switched mode power supply and a related method are provided for controlling switching elements in a power train of a switched mode power supply. The control circuit comprises a mode controller to monitor the output current to determine whether the output current exceeds a current threshold. The mode controller controls the switching controller to generate the switch control signals. When the current exceeds the current threshold, the power train operates in a continuous conduction mode, and when the output current has fallen to or below the current threshold, the operation of the power train is changed from the continuous conduction mode to a pulse skipping mode. The pulse skipping mode is entered from the continuous conduction mode and involves determining the amount of energy stored in a secondary circuit of the power train. | 12-03-2015 |
20150365001 | Gate Drive Power Supply for Inverter - A gate drive power supply (GDPS) system includes a voltage boost stage configured to boost an input voltage into a boost voltage and an inverter stage configured to invert the boost voltage into an AC voltage. The GDPS system further includes gate drive voltage supply circuits transformer coupled to the inverter stage to receive an AC output based on the AC voltage and configured to convert the AC output into DC supply voltages for gate drives. | 12-17-2015 |
20150365002 | POWER CONVERSION SYSTEM AND POWER CONVERSION METHOD - A power conversion system includes at least two power converters and a current sharing bus, each power converter including a switching circuit, a power conversion circuit configured to receive an input voltage via the switching circuit and to provide a local output current, an output sense circuit configured to detect the local output current and to generate a local output current sense signal, a current sharing terminal coupled to the local output current sense signal via a resistor and coupled to the current sharing bus; and a PWM controller configured to adjust a duty cycle of the switching circuit based at least in part on the local output current sense signal provided by the output sense circuit and an average current signal on the current sharing bus. | 12-17-2015 |
20150365003 | Power Conversion System - A power conversion system includes a power input, a power output, and a number of stackable power conversion modules having inputs connected to the power input and outputs connected to the power output, each including a transformer switched at a higher frequency than a grid frequency. | 12-17-2015 |
20150372152 | Semiconductor Device - A semiconductor device includes a substrate having a first conductivity type, a first heavily-doped region formed in the substrate and having the first conductivity type, a second heavily-doped region formed in the substrate and having the first conductivity type, and an embedded layer formed in the substrate and separated from the first and second heavily-doped regions. The embedded layer has a second conductivity type different from the first conductivity type. A portion of the embedded layer is beneath the first heavily-doped region. A third heavily-doped region is formed in the substrate, between the first and second heavily-doped regions, and contacting the embedded layer, and has the second conductivity type. | 12-24-2015 |
20150372586 | Power Factor Correction Control Circuit and Power Adapter Thereof - Disclosed are a power factor correction circuit and a power adapter, and the power factor correction circuit includes a sampler, a controller and a current limiter, and the controller includes an error amplification unit, a peak value adjusting unit, an ON/OFF computing unit and a phase lock unit. The sampler is coupled to the phase lock unit, and the current limiter is coupled to the error amplification unit and the ON/OFF computing unit, so as to achieve the effects of enhancing the power factor property of the power factor correction circuit, lowering the manufacturing cost, and improving the electric power utilization. | 12-24-2015 |
20150381057 | Power Supply Circuits Incorporating Transformers For Combining Of Power Amplifier Outputs And Isolation Of Load Voltage Clamping Circuits - A power supply circuit includes a power amplifier that receives a direct current (DC) voltage from a first power source. A control signal applied to the power amplifier causes the power amplifier to convert the DC voltage to an alternating current (AC) output signal. The AC output signal is applied to a transformer that includes a first winding, a second winding, and a third winding. The first winding receives the AC output signal and the second winding receives an output current that varies in accordance with the AC output signal to apply current to a load. A rectifier includes a plurality of diodes configured to rectify a voltage across the third winding and clamp the voltage at the load. Return power from the third winding may be returned to the first power source. | 12-31-2015 |
20160006359 | DC-DC CONVERTER WITH A PROTECTION STAGE - The invention relates to a DC to DC converter which comprises: (a) regulation stage for receiving a non-regulated DC voltage and for producing a regulated DC voltage; (b) a switching stage for converting said regulated DC voltage to a substantially AC Voltage signal; (e) an isolation stage for receiving said AC Voltage signal, and for producing a regulated output DC voltage having a voltage level which differs from a voltage level of said regulated DC voltage, and for isolating said regulated output DC voltage from said regulation stage; and (d) a control component for providing a feedback from said isolation to said regulation stage; wherein said DC to DC converter comprises at the regulation stage a protection unit which in turn comprises a capacitor in series with a parallel circuit which in turn comprises: a switching element in parallel with a resistor, inductor, or a controlled current limiting element. | 01-07-2016 |
20160020041 | COMPOSITE ELECTRONIC COMPONENT, BOARD HAVING THE SAME, AND POWER SMOOTHER INCLUDING THE SAME - A composite electronic component includes a composite body formed by combining a multilayer ceramic capacitor (MLCC) and a tantalum capacitor. The composite electronic component has an excellent acoustic noise reduction effect, low equivalent series resistance (ESR)/equivalent series inductance (ESL), enhanced DC-bias characteristics, and a reduced chip thickness. | 01-21-2016 |
20160028317 | ELECTRONIC APPARATUS, POWER SUPPLY AND POWER CONTROL METHOD THEREOF - A power supply configured to include a switch which performs a switching operation in accordance with a preset period in a standby mode, a transformer which supplies voltage from a primary side to a secondary side in response to the switching operation of the switch, and a constant-voltage controller which controls voltage supplied to the system by regulating the voltage at the secondary side of the transformer, the constant-voltage controller including a blocking diode which shuts off current flowing from an output of the power supply to the constant-voltage controller in an off-section of the switch. Thus, the power consumption is decreased in the off-section, thereby having an effect on reducing the standby power. | 01-28-2016 |
20160043645 | POWER CONVERSION APPARATUS AND OVER POWER PROTECTION METHOD THEREOF - A power conversion apparatus and an over power protection method thereof are provided. A number of times a sensing voltage exceeding a reference voltage is counted, so as to determine whether to disable a power switch in the power conversion apparatus according to the number of times the sensing voltage exceeding the reference voltage, in which the sensing voltage corresponds to a current flowing through the power switch on a resistor. | 02-11-2016 |
20160043646 | POWER SUPPLY - A DC/DC converter | 02-11-2016 |
20160065077 | DC POWER SUPPLY EQUIPMENT - A power supply equipment includes a plurality of units each including a capacitor and an isolated DC-DC converter connected between the both terminals of the capacitor, wherein DC input sides of the plurality of units are connected in series and the DC output sides are connected together in parallel. The DC power supply equipment also comprises control circuits to control the isolated DC-DC converters. The control circuits generate operation commands to operate some of the plurality of units in an alternating sequence with a same time ratio in a predetermined control period in a light load condition, and the control circuits control the isolated DC-DC converters of the units according to the operation command. | 03-03-2016 |
20160065079 | POWER TRANSFER SYSTEM - A power transfer system and method are provided for transferring power from an AC supply outputting an AC voltage. The system includes a controller and a primary rectifier coupled to the controller and to the AC supply for converting the AC voltage to a DC bus voltage. An inverter is coupled with the primary rectifier and the controller for converting the DC bus voltage to a primary AC voltage. A primary coil is connected to the inverter. A secondary coil is in communication with the primary coil for producing an induced AC voltage. A secondary rectifier is connected to the secondary coil for rectifying the induced AC voltage to a secondary DC voltage. At least one sensor is connected to the secondary rectifier for outputting a signal proportional to the secondary DC voltage and the controller is configured to vary the DC bus voltage based on the signal from the sensor. | 03-03-2016 |
20160072389 | MULTIPLE-PHASE POWER CIRCUIT - A multiple-phase power circuit includes multiple voltage conversion units, a pulse-width modulation (PWM) signal generator and a surge detection circuit. Each voltage conversion unit converts an input voltage to a driving voltage of a pre-set phase. The pulse-width modulation (PWM) signal generator is coupled to the voltage conversion units to output PWM signals of different phases to the voltage conversion units. The surge detection circuit samples the input voltage and compares the input voltage with a reference voltage. Then the surge detection circuit outputs multiple first control signals. The PWM signal generator further stops outputting the PWM signals of different phases when the PWM signal generator receives the multiple first control signals. | 03-10-2016 |
20160079864 | CONVERTER AND METHOD FOR CONTROLING THE SAME - A converter may include a transformer, an overcurrent protection switch configured to be installed at a primary side of the transformer to prevent an overcurrent, a comparator configured to detect a voltage of the overcurrent protection switch to convert the detected voltage into an output current sensing value and compare the output current sensing value with a reference value, and a protection controller configured to normally operate or forcibly turn off the overcurrent protection switch depending on a comparison result of the comparator. | 03-17-2016 |
20160087536 | STACKED POWER CONVERTER ASSEMBLY - A stacked magnetic power converter assembly includes a plurality of converter modules disposed in a stacked arrangement with respect to one another to define a thickness of stacked magnetic power converter assembly. Each converter module includes a primary switching unit, a secondary switching unit, and a converter unit. The converter unit includes a primary terminal in signal communication with the primary switching unit and a secondary terminal in signal communication with the secondary switching unit. Each primary switching unit, each secondary switching unit, and each converter unit is shared among the plurality of converter modules. | 03-24-2016 |
20160087538 | MULTIPURPOSE POWER SUPPLY FOR POWER SWITCH DRIVER APPLICATIONS - A multipurpose power supply suitable for a power switch driver circuit takes an input voltage and generates output voltages at four output terminals. Two output terminals may be connected to voltage supply rails to drive a switched-mode power converter. The voltage output at each output terminal relative to ground is different, allowing the voltage rails to be set to voltages suitable for a variety of different power-switch driver circuits by adjusting the output terminals to which the voltage rails are connected. A reference voltage is applied to one output terminal in order to set the values of the voltages at the remaining output terminals. | 03-24-2016 |
20160094133 | DC-DC CONVERTER AND CONTROL METHOD THEREOF - A soft switching system DC-DC converter includes a switching element, a transformer or a reactor, and a controller configured to control a switching operation of the switching element; and carries out the switching operation of the switching element in a state that a voltage or a current to be applied to the switching element is zero. In a case where a required output value of the DC-DC converter is lower than the minimum output over which soft switching is established, the controller controls the operation of the switching element so that an operation period in which an output of the DC-DC converter becomes the minimum output or higher and a stop period in which the output becomes zero are alternately repeated. | 03-31-2016 |
20160099648 | POWER CONVERSION APPARATUS AND OVER POWER PROTECTION METHOD THEREOF - A power conversion apparatus and an over power protection method thereof are provided. A number of times a detection voltage being greater than a first reference voltage and a number of times the detection voltage being greater than a second reference voltage are counted, so as to obtain a first count value and a second count value, in which the detection voltage is a voltage on a resistor in response to a current flowing through a power switch. Stop switching the power switch when the first count value is greater than or equal to a first threshold value or when the second count value is greater than or equal to a second threshold value. | 04-07-2016 |
20160105094 | PRE-BIAS STARTUP OF A CONVERTER - A method includes comparing, by a voltage-second (VS) controller, a first duty cycle used to control a first switch at a primary side of a power transformer of a DC-to-DC converter with a threshold. The method further includes if a value of the first duty cycle is less than the threshold, controlling, by the VS controller, a second duty cycle used to control a second switch at a secondary side of the power transformer, and maintaining a voltage level at an output voltage node at a non-zero value, and if the value of the first duty cycle is greater than the threshold, controlling, by an output voltage loop, the second duty cycle based on the first duty cycle, and monotonically increasing the voltage level the at the output voltage node from the non-zero value to a predetermined value.. | 04-14-2016 |
20160105115 | LOW POWER CONVERTER - An AC to DC converter system is disclosed in which a conversion circuit for converting an AC input signal to a DC output signal is operably coupled with an enabling circuit designed for sensing and output parameter indicative of the presence or absence of a load at the DC output. The system is designed so that the conversion circuit operates in an inactive standby state when there is no load, and in an active state for supplying DC power when a load is present. The enabling circuit is configured to operate using low power. | 04-14-2016 |
20160118899 | MAGNETIZATION BALANCING METHOD - A method of magnetization balancing for a switching power supply having at least two MOSFETs can include measuring first and second commutation times, adjusting the timing of the on time (pulse width) of the first MOSFET's gate relative to the on time (pulse width) of the second MOSFET's gate, and determining whether the commutation times are equal. | 04-28-2016 |
20160118900 | POWER SUPPLY ADAPTOR - A power supply adapter receives an AC voltage, converts the AC voltage into a DC voltage, and supplies the DC voltage to an electronic device. A DC/DC converter converts the voltage smoothed by a smoothing capacitor into the DC voltage. A device-side connector is connected to the DC/DC converter via a cable, and is configured to be detachably connected to the electronic device. The device-side connector includes a detection unit detecting whether or not the electronic device is connected, and generates a connection detection signal indicating whether or not the electronic device is connected. A control circuit of the DC/DC converter is connected to the detection unit of the device-side connector via the cable, and is set to an operating state when the connection detection signal indicates that the electronic device is connected, and is set to a non-operating state when the connection detection signal indicates that the electronic device is not connected. | 04-28-2016 |
20160126845 | SYNCHRONOUS RECTIFIER DRIVE AND SOFT SWITCHING CIRCUIT - A circuit includes a synchronous rectifier that receives an alternating current (AC) voltage from a transformer secondary and provides a rectified direct current (DC) output voltage in response to a control input signal. A secondary rectifier switching circuit generates the control input signal. A current replica circuit generates a control voltage that replicates a current in the transformer secondary. The control voltage is employed to control switching of the secondary rectifier switching circuit based on the current in the transformer secondary. An offset circuit forces the control voltage in a predetermined direction to mitigate voltage error accumulations in the current replica circuit. A clamp circuit limits the control voltage to a predetermined voltage value. | 05-05-2016 |
20160141962 | CONVERTER - A voltage source converter includes a converter limb directly connected between first and second DC terminals. The converter limb includes an AC terminal, a first limb portion directly connected between the first DC terminal and the AC terminal, and a second limb portion directly connected between the second DC terminal and the AC terminal. Only one of the first and second limb portions includes a multilevel converter block, the other of the first and second limb portions includes a switching block, the switching block is switchable to selectively permit current flow in at least one direction in the corresponding limb portion and inhibit current flow in at least one direction in the corresponding limb portion, and at least one of the first and second limb portions is controllable to control the configuration of an AC voltage waveform at the AC terminal. | 05-19-2016 |
20160141963 | MODULAR MULTI-LEVEL DC-DC CONVERTER FOR HVDC APPLICATIONS - A DC-DC converter for connecting high-voltage DC networks has series-connected sub-converters. The high-voltage DC networks which can be connected to the DC-DC converter can have different transmission symmetries by way of power exchanging devices and additional power exchanging devices. Thus, a symmetrical monopole can be connected to an asymmetrical bipolar network using the invention. | 05-19-2016 |
20160181908 | POWER SUPPLY STARTUP | 06-23-2016 |
20160190934 | METHOD FOR EXTENDING POWER SUPPLY HOLD-UP TIME BY CONTROLLING A TRANSFORMER TURN RATIO - In one embodiment a method of extending power supply hold-up time by controlling a transformer turn ratio may include an input capacitor receiving an input voltage of a transformer unit. A first control transistor may switch a first transformer winding to an on state in response to the input voltage being above a voltage threshold level. The first control transistor may switch the first transformer winding to an off state in response to the input voltage being below the voltage threshold level. A second control transistor may switch a second transformer winding to an on state in response to the input voltage being below the voltage threshold level, wherein the first transformer winding and the second transformer winding may include separate windings located on a same side of a magnetic core of the transformer unit. In an embodiment the transformer unit may include a power supply unit. | 06-30-2016 |
20160190941 | SWITCHING POWER SUPPLY SYSTEM, AND ASSOCIATED CONTROL CIRCUIT TO ELIMINATE FLICKER OF LED - A switching power supply system has a switching circuit and a control circuit. The control circuit has an integrating circuit providing a charge signal by integrating an output current feedback signal, a charge control circuit, and a switching control circuit controlling the switching circuit based on the charge signal and a charge reference signal. The switching power supply system controls an output current stable via controlling the charge signal, so as to eliminate flicker and shimmer of a LED load with low power loss and simple circuit. | 06-30-2016 |
20160204712 | AC-DC CONVERSION CIRCUIT | 07-14-2016 |
20160380425 | SNUBBER CIRCUIT, POWER CONVERTER AND METHODS OF OPERATING THE SAME - A snubber circuit for use with a power converter having an input inductor coupled to a winding of a transformer, and method of operating the same. In one embodiment, the snubber circuit includes a series-coupled clamp diode and a clamp capacitor coupled across the input inductor. The snubber circuit further includes a clamp switch coupled across and configured to regulate a voltage of the clamp capacitor. | 12-29-2016 |
20160380545 | POWER DEVICE FOR DELIVERING POWER TO ELECTRONIC DEVICES AND METHODS OF ASSEMBLING SAME - An energy efficient apparatus includes a switching device, a frequency dependent reactive device, and a control element is provided. The switching device is coupled to a source of electrical power and includes a pair of transistors and is adapted to receive a control signal and to produce an alternating current power signal. The frequency of the alternating current power signal is responsive to the control signal. The frequency dependent reactive device is electrically coupled to the pair of transistors for receiving the alternating current power signal and producing an output power signal. The frequency dependent reactive device is chosen to achieve a desired voltage of the output power signal relative to the frequency of the alternating current power signal. The control element senses an actual voltage of the direct current power signal and modifies the control signal delivered to achieve the desired voltage of the direct current power signal. | 12-29-2016 |
20180026520 | CONVERTER AND CONTROL CIRCUIT | 01-25-2018 |
20180026543 | APPARATUS AND METHOD FOR CONTROLLING SYNCHRONIZING RECTIFIER OF LDC | 01-25-2018 |
20190146531 | METHODS AND APPARATUS FOR VOLTAGE REGULATION USING OUTPUT SENSE CURRENT | 05-16-2019 |