公开(公告)号：US20170331381A1

公开(公告)日：2017-11-16

申请号：US15395641

申请日：2016-12-30

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Yi-Wei Lee ,  Chien-Yang Chen ,  Isaac Y. Chen ,  Ta-Yung Yang

IPC: H02M3/335 ,  H02M1/088 ,  H02M1/42 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M1/088 ,  H02M1/4208 ,  H02M1/4225 ,  H02M1/4258 ,  H02M2001/0009 ,  H02M2001/4291 ,  H02M2003/1566

Abstract: The present invention provides a switching regulator with PFC function and a control circuit and a control method thereof. The switching regulator with PFC function includes a power stage circuit, a current sense circuit, and a control circuit. The power stage circuit operates at least one power switch therein according to an operation signal to convert an input voltage to an output voltage. When a transient voltage of the input voltage exceeds a transient voltage upper limit, or when a transient slew rate of the input voltage exceeds a transient slew rate upper limit, the control circuit adjusts a frequency response gain from a stable state frequency response gain to a transient state frequency response gain, such that a transient current of an output current does not exceed a current upper limit, and/or that a transient response time of the output current does not exceed a threshold transient time period.

公开(公告)号：US09781786B2

公开(公告)日：2017-10-03

申请号：US15008289

申请日：2016-01-27

Applicant: Richtek Technology Corporation

Inventor： Jyun-Che Ho ,  Isaac Y. Chen ,  Yi-Wei Lee

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0848

Abstract: A control circuit of a LED driver utilizes a counter to acquire a cycle and a conduction time or a non-conduction time of an AC phase-cut voltage outputted by a TRIAC dimmer. A bleeding signal is determined according to the cycle and the conduction time or the non-conduction time and used for adjusting a bleeding current so as to avoid a flickering of the LED. The control circuit does not need extra pins for coupling a large capacitor, but the bleeding signal can be still acquired. Preferably, the present invention is suitable for an IC of low pin numbers.

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

IPC: H02M3/157 ,  G05F1/10 ,  H03M1/38 ,  H02M1/00

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.

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

IPC: G05F1/10 ,  H02M3/157 ,  H02M1/00

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。

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

IPC: G05F1/10 ,  H03M1/38

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.

公开(公告)号：US20160285366A1

公开(公告)日：2016-09-29

申请号：US15076908

申请日：2016-03-22

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Yi-Wei Lee ,  Isaac Y. Chen

IPC: H02M3/156 ,  H02M1/14 ,  H02M1/08

CPC classification number: H02M3/156 ,  H02M1/08 ,  H02M1/14 ,  H02M2001/0009 ,  H02M2001/0048 ,  H03K17/166 ,  H03K2217/0027 ,  H05B33/0815 ,  H05B33/0824 ,  Y02B20/347 ,  Y02B70/1491

Abstract: The present invention discloses a current regulator circuit capable of reducing current ripple and a method of reducing current ripple. A power supply circuit generates a load current which originally has a current ripple. The load current is supplied to a load circuit. The current regulator circuit includes a regulator switch coupled to the load circuit, a current sense circuit for sensing the load current, and a control circuit. The control circuit controls the regulator switch to regulate a peak of a current sense signal minus an average of the current sense signal to a non-negative first predetermined value, or regulate the peak minus a valley of the current sense signal to a non-negative second predetermined value.

Abstract translation: 本发明公开了一种能够减小电流纹波的电流调节电路和减小电流纹波的方法。 电源电路产生最初具有电流纹波的负载电流。 负载电流被提供给负载电路。 电流调节器电路包括耦合到负载电路的调节器开关，用于感测负载电流的电流检测电路和控制电路。 控制电路控制调节器开关以调节电流感测信号的峰值减去电流感测信号的平均值为非负的第一预定值，或将峰值减去电流感测信号的谷值为非负值 第二预定值。

公开(公告)号：US09257900B2

公开(公告)日：2016-02-09

申请号：US14061317

申请日：2013-10-23

Applicant: Richtek Technology Corporation

Inventor： Yung-Chih Lai ,  Jyun-Che Ho ,  Isaac Y. Chen

IPC: H03M1/00 ,  H02M1/42 ,  H03K23/00 ,  H03K21/38

CPC classification number: H02M1/42 ,  H02M1/4225 ,  H03K21/38 ,  H03K23/00 ,  Y02B70/12 ,  Y02B70/126 ,  Y02P80/112

Abstract: 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.

Abstract translation: 用于功率因数校正转换器的控制集成电路具有用于检测交流信息和输入信号的直流信息的引脚。 控制集成电路包括信号峰值检测器，用于检测针对输入信号的峰值，以获得输入信号的直流信息。 由于可以通过相同的引脚获得输入信号的交流信息和直流信息，所以可以减小控制集成电路的引脚数。

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

IPC: H02M3/335 ,  H02M1/00

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。