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公开(公告)号：US09083253B2
公开(公告)日：2015-07-14
申请号：US14560774
申请日：2014-12-04
Applicant: Richtek Technology Corporation
Inventor： Isaac Y. Chen , Chien-Fu Tang , Hsin-Yi Wu
CPC classification number: H02M3/33523 , H02M1/32 , H02M2001/0022
Abstract: 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.
Abstract translation: 电力转换电路的控制电路包括多功能引脚，脉冲宽度调制（PWM）信号发生电路，电压检测电路和零电流检测电路。 电压检测电路检测多功能引脚上的信号。 当多功能引脚上的信号大于预定值时，电压检测电路将PWM信号产生电路配置为间歇地导通电力转换电路的电流开关。 零电流检测电路检测多功能引脚的信号，以确定电流开关的导通状态。 当多功能引脚的信号小于预定值时，电压检测电路配置PWM信号产生电路以关断电流开关。
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Patent Agency Ranking
公开(公告)号：US12273038B2
公开(公告)日：2025-04-08
申请号：US18300458
申请日：2023-04-14
Applicant: Richtek Technology Corporation
Inventor： Yu-Chang Chen , Ta-Yung Yang , Kun-Yu Lin , Hsin-Yi Wu
Abstract: A resonant flyback power converter includes: a first transistor and a second transistor which are configured to switch a transformer and a resonant capacitor for generating an output voltage; and a switching control circuit generating first and second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal magnetizes the transformer. The second driving signal includes a resonant pulse having a resonant pulse width and a ZVS pulse during the DCM operation. The resonant pulse is configured to demagnetize the transformer. The resonant pulse has a first minimum resonant period for a first level of the output load and a second minimum resonant period for a second level of the output load. The first level is higher than the second level and the second minimum resonant period is shorter than the first minimum resonant period.
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公开(公告)号：US12273028B2
公开(公告)日：2025-04-08
申请号：US18168580
申请日：2023-02-14
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Yu-Chang Chen , Hsin-Yi Wu , Kun-Yu Lin
Abstract: A resonant asymmetrical half-bridge flyback power converter includes: a first transistor and a second transistor switching a transformer coupled to a capacitor for generating an output power; a voltage divider coupled to an auxiliary winding of the transformer; a differential sensing circuit which includes a first terminal and a second terminal coupled to the voltage divider to sense an auxiliary signal generated by the auxiliary winding for generating a peak signal and a demagnetization-time signal; and a PWM control circuit configured to generate a first PWM signal and a second PWM signal in accordance with the peak signal and the demagnetization-time signal, for controlling the first transistor and the second transistor respectively; wherein a period of an enabling state of the demagnetization-time signal is correlated to the output power level; wherein the peak signal is related to a quasi-resonance of the transformer after the transformer is demagnetized.
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14.发明申请公开(公告)号：US20250030337A1
公开(公告)日：2025-01-23
申请号：US18433417
申请日：2024-02-06
Applicant: Richtek Technology Corporation
Inventor： Kun-Yu Lin , Hsin-Yi Wu , Yu-Chang Chen , Fu-Ciao Syu , Chia-Hsien Yang , Chien-Fu Tang , Ta-Yung Yang
Abstract: A circuit of a resonant power converter comprising: a high-side switch and a low-side switch, coupled to form a half-bridge switching circuit which is configured to switch a transformer for generating an output voltage; a high-side drive circuit, generating a high-side drive signal coupled to drive the high-side switch in response to a high-side control signal; a bias voltage, coupled to a bootstrap diode and a bootstrap capacitor providing a power source from the bootstrap capacitor for the high-side drive circuit; wherein the high-side drive circuit generates the high-side drive signal with a fast slew rate to turn on the high-side switch when the high-side switch is to be turned on with soft-switching; the high-side drive circuit generates the high-side drive signal with a slow slew rate to turn on the high-side switch when the high-side switch is to be turned on without soft-switching.
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公开(公告)号：US20240275275A1
公开(公告)日：2024-08-15
申请号：US18168580
申请日：2023-02-14
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Yu-Chang Chen , Hsin-Yi Wu , Kun-Yu Lin
CPC classification number: H02M3/01 , H02M1/083 , H02M1/32 , H02M3/33571 , H02M3/33592
Abstract: A resonant asymmetrical half-bridge flyback power converter includes: a first transistor and a second transistor switching a transformer coupled to a capacitor for generating an output power; a voltage divider coupled to an auxiliary winding of the transformer; a differential sensing circuit which includes a first terminal and a second terminal coupled to the voltage divider to sense an auxiliary signal generated by the auxiliary winding for generating a peak signal and a demagnetization-time signal; and a PWM control circuit configured to generate a first PWM signal and a second PWM signal in accordance with the peak signal and the demagnetization-time signal, for controlling the first transistor and the second transistor respectively; wherein a period of an enabling state of the demagnetization-time signal is correlated to the output power level; wherein the peak signal is related to a quasi-resonance of the transformer after the transformer is demagnetized.
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公开(公告)号：US20240120845A1
公开(公告)日：2024-04-11
申请号：US18300458
申请日：2023-04-14
Applicant: Richtek Technology Corporation
Inventor： Yu-Chang Chen , Ta-Yung Yang , Kun-Yu Lin , Hsin-Yi Wu
CPC classification number: H02M3/33571 , H02M1/083 , H02M3/01 , H02M3/33592
Abstract: A resonant flyback power converter includes: a first transistor and a second transistor which are configured to switch a transformer and a resonant capacitor for generating an output voltage; and a switching control circuit generating first and second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal magnetizes the transformer. The second driving signal includes a resonant pulse having a resonant pulse width and a ZVS pulse during the DCM operation. The resonant pulse is configured to demagnetize the transformer. The resonant pulse has a first minimum resonant period for a first level of the output load and a second minimum resonant period for a second level of the output load. The first level is higher than the second level and the second minimum resonant period is shorter than the first minimum resonant period.
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