Patent application number | Description | Published |
20100026380 | Reference Generating Apparatus and Sampling Apparatus Thereof - A reference generating apparatus and a sampling apparatus thereof are provided. The coding module is configured to code and decode a first reference signal to retrieve a second reference signal with less power than generating the first reference signal. The second reference signal is identical to the first reference signal in amplitude. | 02-04-2010 |
20100320844 | POWER OFF DELAY CIRCUIT AND METHOD, AND AUDIO SYSTEM WITH POWER OFF DELAY - A power off delay circuit includes a switch connected between an external power input terminal and an internal power supply terminal, a capacitor connected to the internal power supply terminal, and a hysteresis comparator to switch the switch according to the voltages of the external power input terminal and the internal power supply terminal. During on-time of the switch, the external power input terminal is connected to the internal power supply terminal and the capacitor can be charged by the external power source. When the switch is off, the capacitor provides electric power for an internal circuit. Application of the power off delay circuit to an audio system may eliminate the turn-off pops of the audio system. | 12-23-2010 |
20100321849 | OVERSTRESS PROTECTION APPARATUS AND METHOD - An overstress protection apparatus includes a switch detector. The switch is arranged in a grounding path of a load system. The detector detects the current, voltage or temperature of the load system to determine a signal for controlling the switch, to thereby protect the load system working in normal conditions. | 12-23-2010 |
20110101954 | REFERENCE SIGNAL GENERATOR AND METHOD FOR PROVIDING A REFERENCE SIGNAL WITH AN ADAPTIVE TEMPERATURE COEFFICIENT - A voltage source provides a first voltage which is independent of temperature variation and variable, and a voltage step-down circuit provides a second voltage to be subtracted from the first voltage to generate a reference signal. The second voltage has a first temperature coefficient, and the reference signal has a second temperature coefficient. By changing the first voltage, the second temperature coefficient changes accordingly. | 05-05-2011 |
20110109290 | FREQUENCY CONTROL CIRCUIT AND METHOD FOR A NON-CONSTANT FREQUENCY VOLTAGE REGULATOR - A non-constant frequency voltage regulator includes a constant-time trigger to generate a pulse width modulation signal, a current generator to provide a first current to set a constant on-time or a constant off-time for the pulse width modulation signal, and a frequency control circuit to detect the pulse width of a phase node voltage, compare the pulse width with the constant on-time or the constant off-time set by the first current to generate a second current, and add the second current to the first current to supply to the constant-time trigger to control the frequency of the pulse width modulation signal. | 05-12-2011 |
20110109291 | FREQUENCY CONTROL CIRCUIT AND METHOD FOR A NON-CONSTANT FREQUENCY VOLTAGE REGULATOR - A non-constant frequency voltage regulator includes a constant-time trigger to trigger a constant on-time or a constant off-time for a pulse width modulation signal, a current generator to provide a first current to determine the constant on-time or the constant off-time, a power output stage operated by the pulse width modulation signal to produce a load current, and a frequency control circuit for loading feed forward by a second current added to the first current to adjust the constant on-time or the constant off-time for frequency compensation to the pulse width modulation signal. | 05-12-2011 |
20110109398 | FIXED-FREQUENCY CONTROL CIRCUIT AND METHOD FOR PULSE WIDTH MODULATION - A fixed-frequency control circuit and method detect the difference between the frequency of a pulse width modulation signal and a target frequency to adjust a current used to determine the on-time or off-time of the pulse width modulation signal, such that the frequency of the pulse width modulation signal is stable at the target frequency. | 05-12-2011 |
20110163785 | SIMPLE INTERLEAVED PHASE SHIFT CLOCK SYNCHRONIZATION FOR MASTER/SLAVE SCHEME - An apparatus for interleaved phase shift clock synchronization includes a master clock generator and at least one slave clock generator. The master clock generator provides a ramp signal or reset signal for each slave clock generator to generate a clock synchronized with the clock of the master clock generator, and the master and slave clock generators have different reference voltages for generating clocks. Therefore, the clocks generated will be synchronized and interleaved phase with each other. | 07-07-2011 |
20110169463 | ADJUSTABLE DRIVER VOLTAGE SOURCE FOR A SWITCHING POWER SUPPLY AND METHOD FOR ADJUSTING DRIVER VOLTAGE IN A SWITCHING POWER SUPPLY - An adjustable driver voltage source for a switching power supply uses a linear regulator to provide a driver voltage, and a modulator to adjust the driver voltage according to the loading change of the switching power supply. The modulator may lower the driver voltage at light load to reduce the switching loss and thereby increase the power efficiency of the switching power supply. | 07-14-2011 |
20110169473 | MIX MODE WIDE RANGE DIVIDER AND METHOD THEREOF - A mix mode wide range divider is provided for dividing a first signal by a second signal to generate an output signal. A third signal is generated depending on the resistance of a first adjustable resistor, and a fourth signal is generated according to the third signal and a target value determined by the second signal, to adjust the resistance of the first adjustable resistor and the resistance of a second adjustable resistor. The resistance of the first adjustable resistor is so adjusted to make the third signal equal to the target value, and the resistance of the second adjustable resistor is so adjusted to maintain a ratio of the resistance of the second adjustable resistor to the resistance of the first adjustable resistor. The output signal is generated depending on the first signal and the resistance of the second adjustable resistor. | 07-14-2011 |
20110169546 | MIX MODE WIDE RANGE MULTIPLIER AND METHOD THEREOF - A mix mode wide range multiplier and method are provided for multiplying a first signal by a second signal to generate an output signal. A reference signal is generated according to a first gain and a reference value, the output signal is generated according to a second gain and the first signal, a target value is generated according to the second signal, the first gain is adjusted to make the reference signal equal to the target value, and the second gain is adjusted to maintain a ratio of the second gain to the first gain. | 07-14-2011 |
20110233716 | CIRCUIT STRUCTURE OF AN ULTRA HIGH VOLTAGE LEVEL SHIFTER - A circuit structure of an ultra high voltage level shifter includes a low voltage substrate having the electronic elements of the ultra high voltage level shifter thereon, an ultra high voltage redistribution layer, and a passivation layer between the substrate and the redistribution layer to prevent dielectric breakdown between the redistribution layer and the substrate. | 09-29-2011 |
20110260765 | PHASE INTERLEAVING CONTROL METHOD FOR A MULTI-CHANNEL REGULATOR SYSTEM - A multi-channel regulator system includes serially connected PWM integrated circuits, each of which determines a PWM signal for a respective channel to operate therewith, and individually controls its operation mode according to whether or not an external clock is detected. Therefore, each channel will not be limited to operate under a constant mode and could become a master channel or a slave channel. Additionally, each of the PWM integrated circuits generates a phase shifted synchronous clock for its next channel during it is enabled, and thus all the channels operate in a synchronous but phase interleaving manner. | 10-27-2011 |
20110260799 | FREQUENCY SETTING CIRCUIT AND METHOD FOR AN INTEGRATED CIRCUIT - A frequency setting circuit and method for an integrated circuit detect the voltage at a pin of the integrated circuit during a frequency setting period, and determine a frequency setting signal according to the detected voltage to set the frequency of a clock provided by an oscillator in the integrated circuit. After setting the frequency, the frequency setting circuit and method store the frequency setting signal and stop detecting the voltage at the pin. Thus the pin can be used for other functions. | 10-27-2011 |
20110261492 | PROTECTION TO AVOID ABNORMAL OPERATION CAUSED BY A SHORTED PARAMETER SETTING PIN OF AN INTEGRATED CIRCUIT - For a system to avoid abnormal operation caused by a shorted parameter setting pin of an integrated circuit, a protection apparatus and method apply a buffered reference voltage to the parameter setting pin to define an internal parameter of the integrated circuit by the buffered reference voltage and an external element connected to the parameter setting pin, and detect the rapid variation of the internal parameter to trigger a shutdown signal or slow down the speed of the variation of the internal parameter reflected to an adjustable signal of the integrated circuit. | 10-27-2011 |
20110267015 | REAL TIME ADJUSTABLE ZERO CURRENT DETECTION FOR A SWITCHING REGULATOR - A feedback loop is used to optimize a zero current threshold for a switching regulator. After the low side power switch of the switching regulator turns off, the switching node state is monitored to adjust the zero current threshold in a real time and thus the low-side power switch is prevented from turning off too early or too late. Thereby the efficiency in green mode is optimized. | 11-03-2011 |
20120008345 | APPARATUS AND METHOD FOR OUTPUT VOLTAGE CALIBRATION OF A PRIMARY FEEDBACK FLYBACK POWER MODULE - An apparatus and method for output voltage calibration of a primary feedback flyback power module extract the difference between the output voltage of the power module and a target value, and according thereto, calibrate a reference voltage which is used in regulation of the output voltage, to thereby calibrate the output voltage to be the target value. | 01-12-2012 |
20120112816 | CIRCUIT AND METHOD FOR IMPLEMENTING POWER GOOD AND CHIP ENABLE CONTROL BY A MULTI-FUNCTIONAL PIN OF AN INTEGRATED CIRCUIT - A first switch is switched to short a multi-functional pin of an integrated circuit to a ground terminal or let a current supplied to the multi-functional pin to flow to a second switch connected to the multi-functional pin. Before the integrated circuit is ready, the second switch is closed circuit and is detected its current to determine a first signal to enable or disable the integrated circuit. After the integrated circuit is ready, the second switch is open circuit, the voltage at the multi-functional pin is detected to determine a second signal to enable or disable the integrated circuit, and when the voltage at the multi-functional pin is higher than a threshold, a power good signal is triggered. | 05-10-2012 |
20120229165 | CONFIGURATION AND METHOD FOR IMPROVING NOISE IMMUNITY OF A FLOATING GATE DRIVER CIRCUIT - A floating gate driver circuit includes a level shifter, a pass element, a bistable circuit and a control logic circuit, to shift the voltage level of a control signal from a lower one to a higher one. The level shifter or the pass element has loads dynamically controlled by the control logic circuit to filter malfunction caused by dv/dt noise induced by a floating node. | 09-13-2012 |
20130063216 | POWER OFF DELAY CIRCUIT AND METHOD, AND AUDIO SYSTEM WITH POWER OFF DELAY - A power off delay circuit includes a switch connected between an external power input terminal and an internal power supply terminal, a capacitor connected to the internal power supply terminal, and a hysteresis comparator to switch the switch according to the voltages of the external power input terminal and the internal power supply terminal. During on-time of the switch, the external power input terminal is connected to the internal power supply terminal and the capacitor can be charged by the external power source. When the switch is off, the capacitor provides electric power for an internal circuit. Application of the power off delay circuit to an audio system may eliminate the turn-off pops of the audio system. | 03-14-2013 |
20130113450 | MIXED MODE COMPENSATION CIRCUIT AND METHOD FOR A POWER CONVERTER - A mixed mode compensation circuit and method for a power converter generate a digital signal according to a reference value and a feedback signal which is related to the output voltage of the power converter, convert the digital signal into a first analog signal, offset the first analog signal with a variable offset value to generate a second analog signal, and filter out high-frequency components of the second analog signal to generate a third analog signal for stable output voltage of the power converter. The mixed mode compensation does not require large capacitors, and thus the circuit can be integrated into an integrated circuit. | 05-09-2013 |
20130162359 | FREQUENCY JITTER CIRCUIT AND METHOD - An oscillator generates a clock signal according to a voltage, a current and a capacitance, and a frequency jitter circuit and method use a random number to modulate the voltage, the current or the capacitance, or a count value to modulate the capacitance, to jitter the frequency of the clock signal. | 06-27-2013 |
20130169370 | FREQUENCY JITTER CIRCUIT AND METHOD - An oscillator generates a clock signal according to a voltage, a current and a capacitance, and a frequency jitter circuit and method use a random number to modulate the voltage, the current or the capacitance, or a count value to modulate the capacitance, to jitter the frequency of the clock signal. | 07-04-2013 |
20130235633 | CONTROL CIRCUIT FOR POWER CONVERTER AND METHOD THEREOF - A control circuit for a power converter has a current source, a sampling circuit, a signal processing circuit, a driving circuit, and a shared pin. The shared pin is used for coupling with a resistor and a switch. The current source, coupled with the shared pin, provides a current through the shared pin to the resistor in a first period. The sampling circuit, coupled with the shared pin, samples signals on the shared pin for generating a first sampling value and a second sampling value. The signal processing circuit, coupled with the sampling circuit, compares the first sampling value and the second sampling value. The driving circuit generates driving signals for conducting the switch. When the difference of the first sampling value and the second sampling value is less than a predetermined value, the signal processing circuit configures the driving circuit to intermittently conduct the switch in a second period. | 09-12-2013 |
20140268924 | CONTROL CIRCUIT FOR FLYBACK POWER CONVERTER AND CALIBRATION METHOD THEREOF - A control circuit of a flyback power converter includes a first reference signal generating circuit for generating a first reference signal; a reference signal adjusting circuit for generating an adjustment signal according to the first reference signal and a test signal corresponding to an output voltage signal of the flyback power converter, and to generate a second reference signal according to the adjustment signal and the first reference signal; an error detection circuit for generating an error signal according to the second reference signal and a feedback signal; and a control signal generating circuit for generating a control signal according to the error signal to control operations of a power switch to thereby adjust the test signal. The feedback signal corresponds to a current flowing through a primary side coil of the power converter or a sensing voltage of an inductive coil of the power converter. | 09-18-2014 |
20140340949 | POWER CONVERTER AND POWER FACTOR CORRECTOR THEREOF - A power converter includes a rectifier and a power factor corrector. The rectifier is to be coupled to an alternating current power source and is configured to output a rectified signal. The power factor corrector includes a correcting circuit and a control circuit. The correcting circuit receives the rectified signal and is configured to generate an output voltage based on the rectified signal and a driving signal. The control circuit is configured to generate a first to-be-compared signal based on the rectified signal, to generate a second to-be-compared signal based on the output voltage, to compare the first and second to-be-compared signals, and to generate the driving signal based on a result of comparison performed thereby. | 11-20-2014 |
20150070951 | MULTIPLIER-DIVIDER CIRCUIT AND AC-TO-DC POWER CONVERTING APPARATUS INCORPORATING THE SAME - An AC-to-DC power converting apparatus includes a power factor correction circuit generating a DC output voltage based on a rectified voltage obtained through rectifying an AC input voltage and on a PWM signal generated based on an adjustment current and a predetermined ramp signal. A multiplier-divider circuit includes: a ramp generating unit generating a ramp signal based on a clock signal and on a first detection voltage associated with the rectified voltage; a control unit generating a control signal based on the clock signal, the ramp signal, and a detection voltage generated based on the DC output voltage; and an output unit generating an adjustment signal based on an input signal associated with the rectified voltage and the control signal. | 03-12-2015 |
20150130523 | FREQUENCY JITTER CIRCUIT AND METHOD - An oscillator generates a clock signal according to a voltage, a current and a capacitance, and a frequency jitter circuit and method use a random number to modulate the voltage, the current or the capacitance, or a count value to modulate the capacitance, to jitter the frequency of the clock signal. | 05-14-2015 |
20150249392 | SOFT-START SWITCHING POWER CONVERTING APPARATUS WITH PULSE-FREQUENCY MODULATION TECHNIQUE - A switching power converting apparatus includes a voltage conversion module, a detecting unit, and a switching signal generating unit. The voltage conversion module converts an input voltage into an output voltage associated with a secondary side current, which flows through a secondary winding of a transformer and is generated based on a switching signal. The detecting unit generates a detecting signal based on the output voltage and a predetermined reference voltage. The switching signal generating unit generates the switching signal based on the detecting signal and an adjusting signal so that the secondary side current is gradually increased during a start period of the switching power converting apparatus. | 09-03-2015 |
Patent application number | Description | Published |
20110068761 | AVERAGE CURRENT REGULATOR AND DRIVER CIRCUIT THEREOF AND METHOD FOR REGULATING AVERAGE CURRENT - The present invention discloses an average current regulator, a driver circuit of an average current regulator, and a method for regulating an average current. The average current regulator includes: a power stage including at least one power transistor which switches according to a pulse width modulation (PWM) signal to convert an input voltage to an output current; a feedback circuit coupled to the power stage, for generating a feedback signal; an ON-time controller coupled to the feedback circuit, for receiving the feedback signal and generating an ON-time signal according to the feedback signal and an average reference signal relating to a target average current; and a PWM controller, for generating the PWM signal according to the ON-time signal to regulate the average of the output current to the target average current. | 03-24-2011 |
20110187430 | Multi-Chip Module with Master-Slave Analog Signal Transmission Function - The present invention discloses a multi-chip module with master-slave analog signal transmission function. The multi-chip module comprises: a master chip having a first setting input pin for receiving an analog setting signal to generate an analog setting in the master chip, and the master chip duplicating the analog setting to output a first analog output; and a first slave chip for receiving the first analog output from the master chip to generate an internal setting of the first slave chip. | 08-04-2011 |
20120155122 | CONTROLLER AND CONTROLLING METHOD FOR POWER CONVERTER - A controller for a power converter is provided. The controller includes a sense current integrating circuit, a reference current integrating circuit and a drive signal generation circuit. The sense current integrating circuit performs an integrating operation to a sense current representative of a conduction current flowing through a power switch of the power converter and thereby outputs a first integrating result. The reference current integrating circuit performs another integrating operation to a reference current and thereby outputs a second integrating result. The drive signal generation circuit determines a switching period of the power switch according to a status of an output voltage of the power converter cooperative with a relative magnitude relationship between the first integrating result and the second integrating circuit. Furthermore, a controlling method for such power converter also is provided. | 06-21-2012 |
20120306459 | Power Factor Correction Circuit, Control circuit Therefor and Method for Driving Load Circuit through Power Factor Correction - The present invention discloses a power factor correction circuit, a control circuit therefor and a method for driving a power factor correction circuit. The power factor correction circuit receives rectified power obtained by rectifying AC power, and corrects the power factor thereof. The power factor correction circuit includes an inductor, and it generates a reference signal as a limit for the inductor current. The reference signal is proportional to Comp/Vin, wherein Comp is a signal relating to a feedback signal, and Vin is a voltage signal relating to the AC power or the rectified power. | 12-06-2012 |
20130070379 | POWER REGULATOR WITH OVER CURRENT PROTECTION AND CONTROL CIRCUIT THEREOF AND METHOD OF OVER CURRENT PROTECTION - The present invention discloses a power regulator with over current protection (OCP), a control circuit thereof, and a method of over current protection. The power regulator with OCP includes: a primary circuit, a transformer, and a secondary circuit. The power regulator receives AC power, and generates secondary current which is supplied to a load circuit. The primary circuit includes a control circuit which includes: a switch control circuit, a first comparator circuit, a sample and hold circuit, and a compensation circuit which is coupled to the sample and hold circuit. The compensation circuit adaptively adjusts a threshold level of the OCP according to a current sense signal, or controls a delay time of an over current detection signal to compensate an error of the OCP threshold level, which is caused by the AC power, such that the primary current may have a peak corresponding to a predetermined setting. | 03-21-2013 |
20130234790 | CONTROL CIRCUIT FOR POWER CONVERTER AND METHOD THEREOF - A control circuit for a power converter is disclosed, having a shared pin, a driving circuit, a current source, a sampling circuit, and a signal processing circuit. The shared pin is used for coupling with an output end of the power converter through a resistor. The driving circuit is used for conducting a switch of the power converter. The current source provides a current to the resistor through the shared pin. The sampling circuit samples the signal on the shared pin for generating a first sampling value and a second sampling value. When the difference between the first sampling value and the second sampling value is less than a predetermined value, the signal processing circuit configures the driving circuit to adjust at least one of the conduction time and the conduction frequency of the switch according to an output signal of the power converter received from the shared pin. | 09-12-2013 |
20130342127 | LED CONTROL DEVICE FOR PHASE-CUT DIMMING SYSTEM AND CONTROL METHOD THEREOF - An LED control device for configuring a phase-cut dimming system includes an LED and a switch. The LED control device configures the conduction status of the switch so as to supply power to the LED according to an input signal. The LED control device further detects whether the input signal is phase-cut. When the input signal is phase-cut, the LED control device stores the signal values of the internal circuits. Afterward, when the input signal is not phase-cut, the LED control device restores the stored signal values so that the internal circuits may resume to the previous operation status rapidly. | 12-26-2013 |
20140022010 | CONTROL CIRCUIT FOR POWER CONVERTER AND METHOD THEREOF - A control circuit for a power converter includes a shared pin, a driving circuit, a current source, a sampling circuit, and a signal processing circuit. The shared pin is coupled with an output end of the power converter through a resistor. The driving circuit conducts a switch of the power converter. The current source provides a current to the resistor through the shared pin. The sampling circuit samples the signal on the shared pin for generating a first sampling value and a second sampling value. The signal processing circuit calculates a first difference between the first sampling value and a first reference value, and a second difference between the second sampling value and a second reference value. When the difference between the first difference and the second difference is less than a predetermined value, the signal processing circuit may therefore configure the conduction time or frequency of the switch. | 01-23-2014 |
20140176102 | MIXED MODE COMPENSATION CIRCUIT - A mixed mode compensation circuit for a power converter generate a digital signal according to a reference signal and a feedback signal which is related to the output voltage of the power converter, convert the digital signal into a first analog signal, offset the first analog signal with a variable offset value to generate a second analog signal, and filter out high-frequency components of the second analog signal to generate a third analog signal for stable output voltage of the power converter. The mixed mode compensation does not require large capacitors, and thus the circuit can be integrated into an integrated circuit. | 06-26-2014 |
20140192564 | SWITCHING POWER CONVERTING APPARATUS - A switching power converting apparatus is capable of converting an input voltage to an output voltage, and includes a transformer, a primary side control module, and a secondary side control module. The secondary side control module utilizes voltage clamping techniques or current-drawing techniques to stop self-excited conversion from the input voltage to the output voltage when the output voltage is greater than a predetermined target voltage, or utilizes a non-self-excited conversion architecture. | 07-10-2014 |
20140286057 | SWITCHING POWER CONVERTING APPARATUS, SWITCHING CONTROLLER FOR THE SAME, AND METHOD OF CONTROLLING A BIPOLAR JUNCTION TRANSISTOR OF THE SAME - A switching power converting apparatus includes a coil unit, a bipolar junction transistor (BJT) controlling power transfer through the coil unit, and a current sensing resistor sensing a current flowing through the BJT so as to produce a sensed voltage thereacross. A switching controller includes a current source supplying a first current, a current generating module generating, based on an input voltage associated with the sensed voltage, a second current, which is proportional to the current flowing through the BJT, a multiplexing module selecting one of the first and second currents as an output current, and a driving module outputting, based on the output current, a driving current, which is proportional to the output current, to the BJT to thereby conduct the BJT. | 09-25-2014 |
20140316735 | Protection Device and Calibration Method Thereof - The present invention discloses a protection device and a calibration method thereof. The protection device includes a sensing circuit and a detection circuit. The detection circuit includes: a comparing circuit, a setting circuit and an automatic calibration circuit. The comparing circuit is coupled to the sensing circuit and generates a protection signal according to a sensing signal and an offset setting. The setting circuit is coupled to the comparing circuit and generates the offset setting according to a calibration signal. The automatic calibration circuit is coupled between the comparing circuit and the setting circuit, for generating the calibration signal. The automatic calibration circuit automatically sets a protection threshold and stores the calibration signal which corresponds to the protection threshold. | 10-23-2014 |
20150048750 | LIGHT EMITTING SYSTEM AND VOLTAGE CONVERSION DEVICE THEREOF - A light emitting system includes a series connection of a light emitting unit and a variable current source, and a voltage conversion device that includes a rectifier circuit and an output circuit. The rectifier circuit rectifies an AC voltage to generate a rectified voltage across a first rectifier output coupled to one end of the series connection of the light emitting unit and the variable current source, and a second rectifier output. The output circuit is coupled between the second rectifier output and another end of the series connection of the light emitting unit and the variable current source, and is configured to generate a direct-current (DC) output voltage. | 02-19-2015 |
20150117072 | SOFT-START SWITCHING POWER CONVERTER - A soft-start switching power converter includes a voltage converting circuit and a soft-start circuit. The voltage converting circuit includes a transformer, and a first switch which includes a first terminal connected to the transformer, a second terminal providing a trigger signal, and a control terminal receiving a control signal, and which is controlled to switch between conduction and nonconduction, such that the transformer generates a feedback voltage. The soft-start circuit receives the trigger signal, generates the control signal according to the trigger signal, and determines whether or not to clamp the control signal at a preset voltage level based on the trigger signal. | 04-30-2015 |
20150162843 | CONTROL CIRCUIT FOR POWER CONVERTING CIRCUIT - A control circuit for a power converting circuit includes a multifunctional pin, a pulse-width-modulation (PWM) signal generating circuit, a voltage detecting circuit and a zero current detecting circuit. The voltage detecting circuit detects a signal on the multifunctional pin. When the signal on the multifunctional pin is greater than a predetermined value, the voltage detecting circuit configures the PWM signal generating circuit to intermittently conduct a current switch of the power converting circuit. The zero current detecting circuit detects the signal of the multifunctional pin to determine the conduction status of the current switch. When the signal of the multifunctional pin is less than the predetermined value, the voltage detecting circuit configures the PWM signal generating circuit to turn off the current switch. | 06-11-2015 |
20150312025 | SINGLE-WIRE TRANSMISSION INTERFACE AND SINGLE-WIRE TRANSMISSION METHOD AND POWER SUPPLY SYSTEM ADOPTING SINGLE-WIRE TRANSMISSION METHOD - The present invention discloses a single-wire transmission method, which includes: providing a transmission signal including alternating high and low levels through a single-wire, wherein a period of one of the high and low levels defining a reference time and a period of the other of the high and low levels defining a content time; determining a relative relationship between the reference time and the content time; when the content time is smaller than a proportion of the reference time, defining the content time to express a first meaning; and when the content time is larger than the proportion of the reference time, defining the content time to express a second meaning. | 10-29-2015 |
20150340944 | LIGHT EMITTING DEVICE DRIVER CIRCUIT, CURRENT RIPPLE REJECTER THEREIN, AND CURRENT RIPPLE REJECTION METHOD THEREFOR - The present invention discloses a light emitting device driver circuit, a current ripple rejecter therein, and a current ripple rejection method therefor. The light emitting device driver circuit includes: a power converter circuit, for converting an input voltage carrying an AC component to an output voltage and supplying an output current; and a current ripple rejecter, which is coupled to the power converter circuit, for filtering a ripple of the output current to generate a light emitting device current, and supplying the light emitting device current to a light emitting device circuit. The current ripple rejecter includes: a low-pass-filter circuit, for filtering the ripple of the output current to generate a filtered current; and a current amplification circuit, which is coupled to the low-pass-filter circuit, for amplifying the filtered current to generate an amplified current; wherein the light emitting device current includes the amplified current. | 11-26-2015 |
20150366028 | LIGHT EMITTING DEVICE DRIVER CIRCUIT AND DRIVING METHOD OF LIGHT EMITTING DEVICE CIRCUIT - The present invention discloses a light emitting device driver circuit and a driving method of a light emitting device circuit. The light emitting device driver circuit is for driving a light emitting device circuit with plural light emitting devices connected in series. The light emitting device driver circuit determines a number of the conductive light emitting devices according to a rectified input voltage. The light emitting device driver circuit includes: a switch module, a current source circuit, and a total harmonic distortion (THD) compensation circuit. The THD compensation circuit generates an adjustment current according to the rectified input voltage. The current source circuit provides a light emitting device current to the light emitting device circuit according to the adjustment current, such that the THD is reduced. | 12-17-2015 |
20150372601 | POWER SUPPLY SYSTEM AND SHORT CIRCUIT AND/OR BAD CONNECTION DETECTION METHOD THEREOF, AND POWER CONVERTER THEREOF - The present invention discloses a short circuit and/or bad connection detection method for use in a power supply system. The power supply system includes a power converter which converts an input voltage to an output voltage and supplies an output current to an electronic device. In the short circuit detection method, the conversion from the input voltage to the output voltage is disabled in a disable time period, and whether a short circuit occurs is determined according to the decreasing speed of the output voltage. In the bad connection detection method, an actual voltage and an actual current received by the electronic device are compared with the output voltage and the output current, to determine whether a bad connection occurs. | 12-24-2015 |
20150372603 | FLYBACK POWER SUPPLY CIRCUIT WITH PROGRAMMABLE FUNCTION AND CONTROL METHOD THEREOF - The present invention discloses a flyback power supply circuit with a programmable function and a control method thereof. The flyback power supply circuit includes: a transformer circuit, a power switch circuit, a primary side control circuit, an opto-coupler circuit, and a secondary side control circuit. The primary side control circuit determines whether an over voltage condition occurs, and further determines whether to generate an over voltage protection signal to turn OFF a power switch of the power switch circuit according to a rate of increase of a feedback signal and a control level, or according to the rate of increase of the feedback signal and a rate of change of a target control signal. | 12-24-2015 |
20160073461 | LIGHT EMITTING DEVICE DRIVER CIRCUIT - The present invention discloses a light emitting device driver circuit. The light emitting device driver circuit drives a light emitting device circuit. The light emitting device circuit includes plural light emitting devices connected in series and a diode circuit, wherein the plural light emitting devices are divided to plural groups. The light emitting device driver circuit includes: a first switch circuit, a second switch circuit, a current source circuit, and a control circuit. The first switch circuit includes plural first switches connected in parallel to the corresponding groups respectively. The second switch circuit includes plural second switches coupled to a forward end and a reverse end of the diode circuit respectively, wherein the second switch circuit determines whether to conduct the forward end or the reverse end to the current source circuit according to the voltages of the forward end and the reverse end. | 03-10-2016 |
20160100463 | LIGHT EMITTING DEVICE DRIVER CHIP - The present invention discloses a light emitting device driver chip for driving light emitting devices in series. The chip includes: plural pins electrically connected to corresponding light emitting devices, respectively, wherein an internal voltage is provided through a predetermined one of the pins; a voltage regulation circuit for providing an operation voltage according to the internal voltage; a switch circuit including plural switch groups electrically connected to corresponding pins, respectively; a current source circuit for providing a current to the light emitting devices; and a switch control circuit for controlling the switch groups to determine which light emitting device is turned ON. The light emitting device driver chip does not directly receive the rectified input voltage. | 04-07-2016 |
Patent application number | Description | Published |
20080218141 | Circuit for charging a bootstrap capacitor in a voltage converter - For charging a bootstrap capacitor in a voltage converter, a circuit is provided for wider bandwidth to eliminate the feedback stability issue and pin out for compensation circuit. A pair of transistors are connected in series between a power input and the bootstrap capacitor, the first transistor is switched synchronously with a low-side transistor of the voltage converter, and a comparator compares a feedback voltage drawn from a feedback node between the pair of transistors with a reference voltage, to control the second transistor to determine to charge the bootstrap capacitor. | 09-11-2008 |
20080238397 | Circuit and method for soft start of a switching regulator from a residual voltage - For soft start of a switching regulator, the output voltage of the switching regulator is fed back to be compared with a ramp signal, in order to trigger a comparison signal when the ramp signal rises up to reach the feedback signal, to enable the switching regulator such that the output voltage changes from a residual voltage toward a target value. The low side switch of the switching regulator is kept off for a period of time after the switching regulator is enabled, so as to prevent a reverse current during the soft start period. | 10-02-2008 |
20090039704 | Simple circuit and method for improving current balance accuracy of a power converter system - A power converter system includes multiple converter modules connected to a share bus. Each of the converter modules mirrors the phase current of itself to provide a mirror current to the share bus, extracts an average current from the share bus, and compares the phase current of itself with the average current it extracts from the share bus to produce an output signal for modulation of the phase current of itself. Specifically, each of the converter modules is provided with a resistor connected to the share bus such that all the resistors are connected in parallel, and thus each of the resistors automatically receives an average current from the share bus. | 02-12-2009 |
20100033237 | Multi-functional drMOS - A DrMOS combines a high side power MOSFET, a low side power MOSFET and a driver circuit for driving the power MOSFETs with current balance and thermal balance mechanism and variable phase control circuit on a single chip. | 02-11-2010 |
20110006746 | SOFT-START CIRCUIT AND METHOD FOR A SWITCHING REGULATOR - A soft-start circuit for a switching regulator includes a signal generator and a scaling circuit coupled to the signal generator. During soft-start, the signal generator provides a ramp signal for the switching regulator such that the output voltage of the switching regulator changes from a residual voltage toward a target level. When soft-start is triggered, the scaling circuit provides a scaling voltage depending on the residual voltage, to shift the level of the ramp signal and consequently shorten the soft-start time of the switching regulator. | 01-13-2011 |
20120056683 | FREQUENCY JITTER CIRCUIT AND METHOD - An oscillator generates a clock signal according to a voltage, a current and a capacitance, and a frequency jitter circuit and method use a random number to modulate the voltage, the current or the capacitance, or a count value to modulate the capacitance, to jitter the frequency of the clock signal. | 03-08-2012 |
20130176758 | MOSFET BRIDGE RECTIFIER - A bridge rectifier is established by MOSFETs instead of diodes. The MOSFET bridge rectifier includes a voltage detector to detect the voltages of two AC input terminals of the MOSFET bridge rectifier, for identifying the positive and negative half cycles of an AC voltage input to the MOSFET bridge rectifier, thereby accurately controlling the MOSFETs. | 07-11-2013 |
20130207704 | CIRCUIT AND METHOD FOR IMPROVING NOISE IMMUNITY OF A SINGLE-END LEVEL SHIFTER IN A FLOATING GATE DRIVER - A floating gate driver uses a single-end level shifter to translate a set signal and a reset signal induced by a rising edge and a falling edge of a switch signal to a common output terminal to generate an output voltage for a bistable circuit to generate a level shifted switch signal. Under control of a well transient detect signal asserted by detecting noise in the output voltage, a masking circuit between the single-end level shifter and the bistable circuit masks noise in the output voltage. This configuration has lower area penalty and better noise immunity. | 08-15-2013 |
20130229207 | FLOATING GATE DRIVER WITH BETTER SAFE OPERATION AREA AND NOISE IMMUNITY, AND METHOD FOR LEVEL SHIFTING A SWITCH SIGNAL - A floating gate driver includes a level shifter to transmit a set signal and a reset signal to a first output terminal and a second output terminal, respectively. The level shifter includes a first high-voltage transistor, a first current limiter and a first input transistor connected in series between the first output terminal and a ground terminal, and a second high-voltage transistor, a second current limiter and a second input transistor connected in series between the second output terminal and the ground terminal, and the first and second high-voltage transistors are remained on. With this arrangement, the level shifter can transmit signals from low side to high side under better safe operating area and has better noise immunity. | 09-05-2013 |
20140056036 | AC-TO-DC POWER CONVERTER AND CONTROL METHOD AND CONTROL INTEGRATED CIRCUIT THEREOF - An AC-to-DC power converter with a BJT as a power switch can set a base current of the BJT by a current setting resistor which is in the outside of a control integrated circuit. Since an output current and a recovery current of the BJT are injected into a sensing resistor, the AC-to-DC power converter can correctly detect an inductor current thereof from the sensing resistor. | 02-27-2014 |
20140117947 | SIGNAL PEAK DETECTOR AND DETECTION METHOD, AND CONTROL IC AND METHOD FOR A PFC CONVERTER - A control integrated circuit for a power factor correction converter has a pin for detecting an alternating-current information and a direct-current information of an input signal. The control integrated circuit comprises a signal peak detector for detecting a peak value of the input signal to the pin to obtain the direct-current information of the input signal. Since the alternating-current information and the direct-current information of the input signal can be obtained through the same pin, the pin count of the control integrated circuit can be decreased. | 05-01-2014 |
20140139043 | Power Off Delay Circuit and Method, and Audio System with Power Off Delay - A power off delay circuit includes a switch connected between an external power input terminal and an internal power supply terminal, a capacitor connected to the internal power supply terminal, and a hysteresis comparator to switch the switch according to the voltages of the external power input terminal and the internal power supply terminal. During on-time of the switch, the external power input terminal is connected to the internal power supply terminal and the capacitor can be charged by the external power source. When the switch is off, the capacitor provides electric power for an internal circuit. Application of the power off delay circuit to an audio system may eliminate the turn-off pops of the audio system. | 05-22-2014 |
20140253185 | CIRCUIT AND METHOD FOR IMPROVING NOISE IMMUNITY OF A SINGLE-END LEVEL SHIFTER IN A FLOATING GATE DRIVER - A floating gate driver uses a single-end level shifter to translate a set signal and a reset signal induced by a rising edge and a falling edge of a switch signal to a common output terminal to generate an output voltage for a bistable circuit to generate a level shifted switch signal. Under control of a well transient detect signal asserted by detecting noise in the output voltage, a masking circuit between the single-end level shifter and the bistable circuit masks noise in the output voltage. This configuration has lower area penalty and better noise immunity. | 09-11-2014 |
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 |
20160049865 | FAST START-UP CIRCUIT OF A FLYBACK POWER SUPPLY AND METHOD THEREOF - A fast start-up circuit and a method of a flyback power supply utilize a charging current that is related to an input voltage of the flyback power supply to charge a control terminal of a power switch of the flyback power supply during a start-up mode. Accordingly, the power switch can be switched, and a supply voltage of the flyback power supply rises. When an output terminal of the flyback power supply occurs a short circuit, the fast start-up circuit and the method of the present invention will decrease a maximum of a current through the power switch, thereby avoiding that the power switch is overheating. | 02-18-2016 |