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公开(公告)号：US20190028033A1
公开(公告)日：2019-01-24
申请号：US16040501
申请日：2018-07-19
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Isaac Y. Chen , Tzu-Chen Lin , Kun-Yu Lin , Li-Yang Hsiao , Yung-Chih Lai
Abstract: A flyback power converter includes a transformer having an auxiliary winding for generating an auxiliary voltage and providing a supply voltage on a supply node; a primary side controller circuit which is powered by the supply voltage from the supply node; and a high voltage (HV) start-up circuit. The HV start-up circuit is coupled to an high voltage signal through a HV input terminal and generates the supply voltage through a supply output terminal, wherein when the supply voltage does not exceed a start-up voltage threshold, a HV start-up switch conducts the HV input terminal and the supply output terminal to provide the supply voltage, and when the supply voltage exceeds a start-up voltage threshold, the HV start-up switch is OFF. The HV start-up circuit and the primary side controller circuit are packaged in two separate integrated circuit packages respectively.
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公开(公告)号：US09703302B2
公开(公告)日：2017-07-11
申请号：US15201440
申请日：2016-07-02
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Jiun-Hung Pan , Isaac Y. Chen
CPC classification number: G05F1/10 , H02M3/157 , H02M2001/0025 , H03M1/38
Abstract: 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.
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公开(公告)号：US09541929B2
公开(公告)日：2017-01-10
申请号：US14192431
申请日：2014-02-27
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Jiun-Hung Pan , Isaac Y. Chen
CPC classification number: G05F1/10 , H02M3/157 , H02M2001/0025 , H03M1/38
Abstract: 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.
Abstract translation: 用于功率转换器的混合模式补偿电路根据参考信号和与功率转换器的输出电压相关的反馈信号产生数字信号，将数字信号转换为第一模拟信号，将第一模拟信号与 可变偏移值，用于产生第二模拟信号，并且滤除第二模拟信号的高频分量以产生用于稳定的功率转换器的输出电压的第三模拟信号。 混合模式补偿不需要大电容器，因此电路可以集成到集成电路中。
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公开(公告)号：US20160327967A1
公开(公告)日：2016-11-10
申请号：US15201440
申请日：2016-07-02
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Jiun-Hung Pan , Isaac Y. Chen
CPC classification number: G05F1/10 , H02M3/157 , H02M2001/0025 , H03M1/38
Abstract: 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.
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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
36.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：US10355612B2
公开(公告)日：2019-07-16
申请号：US15865212
申请日：2018-01-08
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Su-Yuan Lin , Yi-Wei Lee , Isaac Y. Chen
Abstract: A flyback power converter circuit converting an input voltage to an output voltage includes a transformer, a power switch, a synchronous rectifier (SR) switch, and a secondary side control circuit. The secondary side control circuit controls the SR switch to be ON when the power switch is OFF. The secondary side control circuit includes a driving switch for controlling the SR switch, a synchronous control circuit powered by a voltage related to the output voltage, which controls the driving switch to operate the SR switch, and a clamping circuit including a clamping switch and a clamping switch control circuit. The clamping switch control circuit controls the clamping switch according to a current inflow terminal voltage of the clamping switch and/or the voltage related to the output voltage, such that, during a secondary side power-on period, an equivalent impedance of the current inflow terminal of the clamping switch is smaller than a predetermined clamping impedance.
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公开(公告)号：US20190115844A1
公开(公告)日：2019-04-18
申请号：US16132367
申请日：2018-09-15
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Jo-Yu Wang , Isaac Y. Chen
CPC classification number: H02M3/33592 , H02M1/08 , H02M3/33523 , H02M2001/0006
Abstract: A flyback power converter includes: a transformer, a power switch, a switch control unit, a synchronous rectifier switch and a secondary side control circuit. The secondary side control circuit includes: a switch signal generation circuit and a first power conversion circuit. The secondary side control circuit is coupled to the synchronous rectifier switch and the secondary winding of the transformer. The switch signal generation circuit generates the synchronous rectifier switch signal selectively according to a first power or a second power, to control the synchronous rectifier switch. The first power is related to the output voltage. The first power conversion circuit generates the second power according to a secondary phase signal on a phase node between the secondary winding of the transformer and the synchronous rectifier switch.
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公开(公告)号：US20180138797A1
公开(公告)日：2018-05-17
申请号：US15485226
申请日：2017-04-11
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Pei-Sheng Tsu , Chien-Fu Tang , Isaac Y. Chen
CPC classification number: H02M1/08 , H02H9/001 , H02H9/02 , H02M1/32 , H02M3/33523 , H02M3/33592 , H02M2001/0029 , Y02B70/1475
Abstract: The present invention provides a power switch control circuit and an open detection method thereof. The power switch control circuit is for generating an operation signal at an operation signal output pin according to an input signal, wherein the operation signal is for operating a power switch. The power switch control circuit includes: a current injection circuit, which is connected to the operation signal output pin, and provides a predetermined current to the operation signal output pin according to an enable signal; and an open detection circuit, which is coupled to the current injection circuit, and determines whether a connection between the operation signal output pin and the power switch is open according to a level of the operation signal output pin at a detection time point or according to a level variation of the operation signal output pin during a detection time period, whereby an open detection signal is generated.
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公开(公告)号：US20160327969A1
公开(公告)日：2016-11-10
申请号：US15201476
申请日：2016-07-03
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Jiun-Hung Pan , Isaac Y. Chen
CPC classification number: G05F1/10 , H02M3/157 , H02M2001/0025 , H03M1/38
Abstract: 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.
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