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公开(公告)号：US20220006392A1
公开(公告)日：2022-01-06
申请号：US17356767
申请日：2021-06-24
Applicant: Richtek Technology Corporation
Inventor： Yu-Chang Chen , Wei-Hsu Chang , Kun-Yu Lin , Ta-Yung Yang
Abstract: A flyback converter includes a power transformer, a primary side switch, a secondary side switch and a controller. A secondary side switching signal has an SR pulse for achieving synchronous rectification, and a ZVS pulse for achieving zero voltage switching. The ZVS pulse is enabled according to a first characteristic of a resonance waveform, whereas, a primary side switching signal is enabled according to a second characteristic of resonance waveform. When an output current increases, the primary side switching signal is disabled during an inhibition interval, such that primary side switching signal does not overlap with the ZVS pulse, thereby preventing the primary and secondary side switches from being both conductive simultaneously. The inhibition interval is correlated with a rising edge of the primary side switching signal in a previous switching period and a resonance period of the resonance waveform.
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公开(公告)号：US10097092B1
公开(公告)日：2018-10-09
申请号：US15911125
申请日：2018-03-04
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Jyun-Che Ho , Yu-Chang Chen , Jo-Yu Wang , Yi-Wei Lee , Isaac Y. Chen
IPC: H02M3/158
Abstract: A multi-phase switching regulator includes: a plurality of power stages, a plurality of pulse width modulation (PWM) controllers and a ramp signal setting circuit. The PWM controllers generate corresponding PWM signals for controlling corresponding power stages respectively according to an error signal related to an output voltage and a plurality of ramp signals corresponding to corresponding power stages respectively. The ramp signal setting circuit adjusts the ramp signal of the phase that is to be enabled or disabled according to the phase adjustment signal. Under a phase-cut operation, the ramp signal setting circuit causes a basis level of the ramp signal corresponding to the phase to be disabled to gradually change, thereby decreasing a duty ratio of the PWM signal corresponding to the phase to be disabled.
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公开(公告)号：US20240297568A1
公开(公告)日：2024-09-05
申请号：US18458996
申请日：2023-08-30
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Chao-Chi Chen , Yu-Chang Chen , Syuan-Zong Lan , Yi-Ju Lu
CPC classification number: H02M1/0045 , G05F1/56 , H02M3/33507
Abstract: A voltage regulator for converting an input voltage to an output voltage includes: a first and a second high-side switch, a first and a second low-side switch and a control terminal which is for generating a reference voltage or determining a forced pass-through mode. The output voltage is determined according to the reference voltage during a buck mode and a boost mode. When the input voltage is higher than a first threshold, the voltage regulator is operated in the buck mode. When the input voltage is lower than a second threshold, the voltage regulator is operated in the boost mode. When the input voltage is lower than the first threshold and is higher than the second threshold, the voltage regulator is operated in a pass-through mode. When a voltage of the control terminal is lower than a third threshold, the voltage regulator is operated in the forced pass-through mode.
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公开(公告)号：US20210111634A1
公开(公告)日：2021-04-15
申请号：US16888923
申请日：2020-06-01
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Wei-Hsu Chang , Ta-Yung Yang , Yu-Chang Chen , Chao-Chi Chen , Chuh-Ching Li , Li-Di Lo , Hao-Wen Chung
IPC: H02M3/335 , G01R19/165 , H03M1/12
Abstract: A flyback power converter includes a primary side controller circuit for controlling a primary side switch; and a secondary side controller circuit for generating an SR (Synchronous Rectification) signal to control an SR switch. The SR signal includes an SR pulse and a ZVS (Zero Voltage Switching) pulse. The SR pulse controls the SR switch for synchronous rectification at the secondary side. The secondary side controller circuit samples and holds a voltage at a first end of the SR switch as a first voltage at a timing between the end of the ZVS pulse and the beginning of the SR pulse, and determines a length of the ZVS pulse so as to control the SR switch to be conductive for a ZVS time period, whereby the primary side switch achieves ZVS. The first voltage is proportional to an input voltage.
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公开(公告)号：US09755529B2
公开(公告)日：2017-09-05
申请号：US15147182
申请日：2016-05-05
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yu-Chang Chen , Li-Di Luo , Tzu-Chen Lin
CPC classification number: H02M3/33515 , H02M1/08 , H02M3/33592 , H02M2001/0006 , H02M2001/0009 , Y02B70/1475
Abstract: The present invention provides a flyback power converter and a control circuit thereof. The flyback power converter includes a transformer, a power switch, a driver, a synchronous rectification (SR) switch, a controller, and a signal coupler circuit. The transformer has a primary winding and a secondary winding. The power switch controls the conduction time of the primary winding; and the SR switch controls the conduction time of the secondary winding. The controller controls the SR switch and generates an ON pulse signal and an OFF pulse signal in a normal operation mode. When an output voltage reaches a lower limit voltage, the flyback power converter operates in the normal operation mode. The driver generates a switching signal according to the ON pulse signal and the OFF pulse signal in the normal operation mode, to determine a start conduction time point and an end conduction time point of the primary winding.
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Patent Agency Ranking
公开(公告)号：US20160329819A1
公开(公告)日：2016-11-10
申请号：US15147182
申请日：2016-05-05
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yu-Chang Chen , Li-Di Luo , Tzu-Chen Lin
CPC classification number: H02M3/33515 , H02M1/08 , H02M3/33592 , H02M2001/0006 , H02M2001/0009 , Y02B70/1475
Abstract: The present invention provides a flyback power converter and a control circuit thereof. The flyback power converter includes a transformer, a power switch, a driver, a synchronous rectification (SR) switch, a controller, and a signal coupler circuit. The transformer has a primary winding and a secondary winding. The power switch controls the conduction time of the primary winding; and the SR switch controls the conduction time of the secondary winding. The controller controls the SR switch and generates an ON pulse signal and an OFF pulse signal in a normal operation mode. When an output voltage reaches a lower limit voltage, the flyback power converter operates in the normal operation mode. The driver generates a switching signal according to the ON pulse signal and the OFF pulse signal in the normal operation mode, to determine a start conduction time point and an end conduction time point of the primary winding.
Abstract translation: 本发明提供一种反激式功率转换器及其控制电路。 反激式功率转换器包括变压器，电源开关，驱动器，同步整流（SR）开关，控制器和信号耦合器电路。 变压器具有初级绕组和次级绕组。 电源开关控制初级绕组的导通时间; 并且SR开关控制次级绕组的导通时间。 控制器控制SR开关，并在正常工作模式下产生ON脉冲信号和OFF脉冲信号。 当输出电压达到下限电压时，反激式电源转换器在正常工作模式下工作。 驱动器根据ON脉冲信号和OFF脉冲信号在正常工作模式下产生开关信号，以确定初级绕组的启动导通时间点和结束导通时间点。
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公开(公告)号：US12199521B2
公开(公告)日：2025-01-14
申请号：US17840540
申请日：2022-06-14
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Yu-Chang Chen
Abstract: A synchronous full-bridge rectifier circuit includes: a first high-side transistor, a first low-side transistor, a second high-side transistor and a second low-side transistor which are configured to generate a DC power source from an AC power source, wherein the first high-side transistor and the first low-side transistor are coupled to a live wire of the AC power source, and the second high-side transistor and the second low-side transistor are coupled to a neutral wire of the AC power source; a first detection transistor, coupled to the live wire and configured to generate a first detection signal; and a second detection transistor, coupled to the neutral wire configured to generate a second detection signal; wherein the first low-side transistor is turned on after the body-diode of the first low-side transistor is turned on; the second low-side transistor is turned on after the body-diode of the second low-side transistor is turned on.
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公开(公告)号：US11496063B2
公开(公告)日：2022-11-08
申请号：US17356767
申请日：2021-06-24
Applicant: Richtek Technology Corporation
Inventor： Yu-Chang Chen , Wei-Hsu Chang , Kun-Yu Lin , Ta-Yung Yang
Abstract: A flyback converter includes a power transformer, a primary side switch, a secondary side switch and a controller. A secondary side switching signal has an SR pulse for achieving synchronous rectification, and a ZVS pulse for achieving zero voltage switching. The ZVS pulse is enabled according to a first characteristic of a resonance waveform, whereas, a primary side switching signal is enabled according to a second characteristic of resonance waveform. When an output current increases, the primary side switching signal is disabled during an inhibition interval, such that primary side switching signal does not overlap with the ZVS pulse, thereby preventing the primary and secondary side switches from being both conductive simultaneously. The inhibition interval is correlated with a rising edge of the primary side switching signal in a previous switching period and a resonance period of the resonance waveform.
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公开(公告)号：US20220329151A1
公开(公告)日：2022-10-13
申请号：US17716933
申请日：2022-04-08
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Yu-Chang Chen
Abstract: A switched capacitor converter circuit includes: a conversion capacitor; an output capacitor; and switches configured to switch the coupling configurations of the conversion capacitor and the output capacitor according to a level of the first power supply voltage of the switched capacitor converter circuit, to generate the second power supply voltage at the output capacitor according to the first power supply voltage. The second power supply voltage provides power to control the power converter circuit. When the first power supply voltage is higher than a high threshold, the switched capacitor converter circuit controls the second power supply voltage to be lower than the first power supply voltage. When the first power supply voltage is lower than a low threshold, the switched capacitor converter circuit controls the second power supply voltage to be higher than the first power supply voltage.
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20.发明授权公开(公告)号：US11411489B2
公开(公告)日：2022-08-09
申请号：US17341074
申请日：2021-06-07
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Ta-Yung Yang , Kun-Yu Lin , Yu-Chang Chen
Abstract: A resonant half-bridge flyback power converter includes: a power transformer and a resonant capacitor which are coupled in series between a half-bridge power stage and an output power; and a primary controller circuit controlling a high side power switch and a low side power switch of the half-bridge power stage. When the high side switch is OFF, the control signal of the low side power switch includes a resonant switching pulse for achieving resonant switching of the low side switch and a soft switching pulse for achieving ZVS of the high side switch. When the output power is lower than a delay threshold, the primary controller circuit determines a delay period which is between the resonant switching pulse and the soft switching pulse to control both the high side power switch and the low side power switch to be OFF. The delay period is negatively correlated with the output power.
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