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公开(公告)号：US20180212528A1
公开(公告)日：2018-07-26
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
CPC classification number: H02M3/33592 , H02M1/08 , H02M1/32 , H02M1/36 , Y02B70/1475
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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22.发明申请公开(公告)号：US20170163162A1
公开(公告)日：2017-06-08
申请号：US15433761
申请日：2017-02-15
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuang-Fu Chang , Tzu-Chen Lin , Chien-Fu Tang
IPC: H02M3/335 , H03K17/785 , H02M1/08 , H03L7/00
CPC classification number: H02M3/33523 , H02M2001/0032 , Y02B70/16
Abstract: The present invention provides a flyback power converter with a programmable output and a control circuit and a control method thereof. The flyback power converter converts an input voltage to a programmable output voltage according to a setting signal, wherein the programmable output voltage switches between different levels. The flyback power converter includes: a transformer circuit, a power switch circuit, a current sense circuit, an opto-coupler circuit, and a control circuit. The control circuit adaptively adjusts an operation signal according to a level of the programmable output voltage, to maintain a same or relatively higher operation frequency of the operation signal when the programmable output voltage switches to a relatively lower level, so as to maintain a phase margin while supplying the same output current.
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23.发明授权公开(公告)号：US09614449B2
公开(公告)日：2017-04-04
申请号：US14879175
申请日：2015-10-09
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuang-Fu Chang , Tzu-Chen Lin , Chien-Fu Tang
CPC classification number: H02M3/33523 , H02M2001/0032
Abstract: The present invention provides a flyback power converter with a programmable output and a control circuit and a control method thereof. The flyback power converter converts an input voltage to a programmable output voltage according to a setting signal, wherein the programmable output voltage switches between different levels. The flyback power converter includes: a transformer circuit, a power switch circuit, a current sense circuit, an opto-coupler circuit, and a control circuit. The control circuit adaptively adjusts an operation signal according to a level of the programmable output voltage, to maintain a same or relatively higher operation frequency of the operation signal when the programmable output voltage switches to a relatively lower level, so as to maintain a phase margin while supplying the same output current.
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公开(公告)号：US09024607B2
公开(公告)日：2015-05-05
申请号：US13789287
申请日：2013-03-07
Applicant: Richtek Technology Corporation
Inventor： Tsung-Hsi Yang , Isaac Y. Chen , Chien-Fu Tang , Jiun-Hung Pan
CPC classification number: H02M7/06 , H02M1/4225 , H02M3/156 , Y02B70/126
Abstract: 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.
Abstract translation: 用于功率转换器的控制电路具有电流源，采样电路，信号处理电路，驱动电路和共享引脚。 共享引脚用于与电阻和开关耦合。 与共享引脚耦合的电流源在第一周期内通过共享引脚提供电流到电阻器。 与共享引脚耦合的采样电路在共享引脚上采样信号以产生第一采样值和第二采样值。 与采样电路耦合的信号处理电路比较第一采样值和第二采样值。 驱动电路产生用于导通开关的驱动信号。 当第一采样值和第二采样值的差小于预定值时，信号处理电路将驱动电路配置为在第二周期内间歇地导通开关。
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公开(公告)号：US08717091B2
公开(公告)日：2014-05-06
申请号：US13796547
申请日：2013-03-12
Applicant: Richtek Technology Corporation
Inventor： Yung-Chih Lai , Isaac Y. Chen , Chien-Fu Tang , Jiun-Hung Pan
IPC: G05F1/10
CPC classification number: G05B21/02 , H02M3/156 , H02M2001/0003
Abstract: 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.
Abstract translation: 公开了一种用于功率转换器的控制电路，其具有共享引脚，驱动电路，电流源，采样电路和信号处理电路。 共享引脚用于通过电阻与功率转换器的输出端耦合。 驱动电路用于导通电源转换器的开关。 电流源通过共享引脚向电阻提供电流。 采样电路对共享引脚上的信号进行采样，以产生第一采样值和第二采样值。 当第一采样值和第二采样值之间的差小于预定值时，信号处理电路将驱动电路配置为根据输入信号的输入信号调整开关的导通时间和导通频率中的至少一个 从共享引脚接收功率转换器。
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Patent Agency Ranking
公开(公告)号：US11303218B2
公开(公告)日：2022-04-12
申请号：US16926726
申请日：2020-07-12
Applicant: Richtek Technology Corporation
Inventor： Isaac Y. Chen , Chien-Fu Tang , Jo-Yu Wang
Abstract: A low delay time power converter circuit includes a driver circuit and a load. The driver circuit generates a switching driving signal to control the load. The driver circuit includes a switching control circuit and an output stage circuit which includes a first power switch, a second power switch and an impedance adjusting circuit. When the switching control circuit controls the switching driving signal to a first voltage level at a first time point, the first power switch is turned ON and then is turned OFF after a predetermined period. When the switching control circuit controls the switching driving signal to a second voltage level at a second time point, the second power switch is turned ON. The time point when the first power switch is turned OFF is earlier than the second time point. A resistance of the impedance adjusting circuit is larger than a conductive resistance of the first power switch.
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公开(公告)号：US11169179B2
公开(公告)日：2021-11-09
申请号：US17115662
申请日：2020-12-08
Applicant: Richtek Technology Corporation
Inventor： Isaac Y. Chen , Chien-Fu Tang , Hsin-Yi Wu , Kai-Chuan Chan , Yu-Lin Yang
Abstract: A current sensing circuit having self-calibration includes two leads, a sensing element having a sensing resistance, and a sensing and calibration circuit. The sensing and calibration circuit senses and calibrates a sensing voltage of the sensing element, and senses a sensing current through the sensing element according to the sensing resistance and the sensing voltage, to generate a current sensing output signal. The sensing and calibration circuit includes two pads, a V2I circuit, a current mirror circuit and an I2V circuit. The sensing element has a first temperature coefficient (TC). The TC and/or the resistance of an adjusting resistor in the V2I circuit and an adjusting resistor in the I2V circuit are determined according to the first TC, such that the TC of the current sensing output signal is equal to 0.
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公开(公告)号：US10560012B1
公开(公告)日：2020-02-11
申请号：US16247520
申请日：2019-01-14
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Ta-Yung Yang , Tzu-Chen Lin , Chien-Fu Tang
Abstract: A ZVS (zero voltage switching) control circuit for use in a flyback power converter includes a primary side controller and a secondary side controller. The primary side controller generates a switching signal to control a power transformer through a power transistor to generate an output voltage. The secondary side controller generates an SR (synchronous rectifier) signal to control an SR transistor at a secondary side of the power transformer. The SR signal includes an SR-control pulse and a ZVS pulse. The SR-control pulse controls the SR transistor according to a demagnetizing period of the power transformer. The ZVS pulse determines the starting timing of the switching signal to achieve zero voltage switching for the power transistor. The secondary side controller generates the ZVS pulse after a delay time from when the power transformer is demagnetized. The delay time is determined according to an output load of the output voltage.
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29.发明申请公开(公告)号：US20190296651A1
公开(公告)日：2019-09-26
申请号：US16219831
申请日：2018-12-13
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Hsin-Yi Wu , Isaac Y. Chen
Abstract: A discrete-time current sense circuit includes: a current mirror circuit, which includes: a power switch, for providing the communication current; and a sampling switch, which is for sampling the communication protocol current in a sampling period in a discrete manner, to generate a sampling current; a bias circuit, for providing a reference voltage to the reference node in the sampling period according to a communication protocol voltage of the communication protocol voltage node; a signal conversion circuit, for generating the discrete-time current sense signal according to the sampling current; and a first switch, for operating to determine the sampling period; wherein the sampling period is part of a complete period in which the power switch provides the communication protocol current.
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公开(公告)号：US10291137B2
公开(公告)日：2019-05-14
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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