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.

公开(公告)号：US10014783B2

公开(公告)日：2018-07-03

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 ,  H02M1/42 ,  H02M1/00 ,  H02M3/156 ,  H02M1/088

CPC classification number: H02M3/33507 ,  H02M1/088 ,  H02M1/4208 ,  H02M1/4225 ,  H02M1/4258 ,  H02M2001/0009 ,  H02M2001/4291 ,  H02M2003/1566 ,  Y02B70/126 ,  Y02P80/112

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：US09048732B2

公开(公告)日：2015-06-02

申请号：US14294789

申请日：2014-06-03

Applicant: Richtek Technology Corporation

Inventor： Yi-Wei Lee ,  Chih-Feng Huang ,  Kuo-Chin Chiu

IPC: H02M7/217 ,  H02M7/537 ,  H01L29/808 ,  H02M7/00 ,  H01L29/06

CPC classification number: H02M7/217 ,  H01L29/0692 ,  H01L29/808 ,  H02M7/003 ,  H02M7/537

Abstract: A control circuit for an AC-DC power converter includes a junction field effect transistor (JFET), a first resistor, a second resistor, and a third resistor. The JFET includes a substrate, a drain, a source, a gate, a first oxide layer, and a second oxide layer. The first oxide layer is attached to a region located between the drain and the gate of the JFET, and the second oxide layer is not attached to a region located between the drain and the gate of the JFET. The first resistor is positioned on the first oxide layer, and the second resistor and the third resistor are positioned on the second oxide layer. When the JFET and the first resistor receive an input power signal, the first, the second, and the third resistors divide the input power signal, and prevent from the breakdown of the first oxide layer and the second oxide layer.

Abstract translation: 用于AC-DC电力转换器的控制电路包括结型场效应晶体管（JFET），第一电阻器，第二电阻器和第三电阻器。 JFET包括衬底，漏极，源极，栅极，第一氧化物层和第二氧化物层。 第一氧化物层附接到位于JFET的漏极和栅极之间的区域，并且第二氧化物层未附接到位于JFET的漏极和栅极之间的区域。 第一电阻器位于第一氧化物层上，第二电阻器和第三电阻器位于第二氧化物层上。 当JFET和第一电阻器接收输入功率信号时，第一，第二和第三电阻器分割输入功率信号，并防止第一氧化物层和第二氧化物层的击穿。

公开(公告)号：US11581797B2

公开(公告)日：2023-02-14

申请号：US17680245

申请日：2022-02-24

Applicant: Richtek Technology Corporation

Inventor： Wei-Hsu Chang ,  Shih-Jen Yang ,  Yi-Wei Lee ,  Ta-Yung Yang

IPC: H02M1/00 ,  H02M3/155 ,  H02M3/335

Abstract: A multiple output universal serial bus travel adaptor includes: at least one AC-DC converter for converting an AC power to a first DC power; at least one DC-DC converter for providing a second DC power according to the first DC power; plural switches which are coupled to the AC-DC converter and/or the DC-DC converter to provide the first DC power or the second DC power to corresponding connectors according to operation signals; and a protocol controller configured to generate the operation signals according to at least one of the following parameters: a) the types of the connectors; b) whether there is a mobile device connected with the connectors; c) a first command from the mobile device; d) the power consumed by the mobile devices; e) the currents flowing through the connectors; and f) the voltages at the connectors.

公开(公告)号：US20220321012A1

公开(公告)日：2022-10-06

申请号：US17711343

申请日：2022-04-01

Applicant: Richtek Technology Corporation

Inventor： Yong-Cyuan Chen ,  Tzu-Chen Lin ,  Yi-Wei Lee ,  Ta-Yung Yang

IPC: H02M3/158 ,  H02M1/00

Abstract: A switching regulator includes a first switch, a second switch, an inductor coupled to the first and second switches, and a control circuit. The control circuit controls the first switch to be ON for an ON time period. Next, the control circuit controls the first and second switches to be OFF for a first dead time period. Next, the control circuit controls the second switch to be ON for a synchronous rectification time period. Next, the control circuit controls the first and second switches to be OFF for a second dead time period. Next, the control circuit controls the second switch to be ON for a zero-voltage-switching pulse time period. Next, the control circuit controls the first and second switches to be OFF for a third dead time period. By the above operations, the first switch achieves soft switching.

公开(公告)号：US20220271645A1

公开(公告)日：2022-08-25

申请号：US17680245

申请日：2022-02-24

Applicant: Richtek Technology Corporation

Inventor： Wei-Hsu Chang ,  Shih-Jen Yang ,  Yi-Wei Lee ,  Ta-Yung Yang

IPC: H02M1/00 ,  H02M3/335 ,  H02M3/155

Abstract: A multiple output universal serial bus travel adaptor includes: at least one AC-DC converter for converting an AC power to a first DC power; at least one DC-DC converter for providing a second DC power according to the first DC power; plural switches which are coupled to the AC-DC converter and/or the DC-DC converter to provide the first DC power or the second DC power to corresponding connectors according to operation signals; and a protocol controller configured to generate the operation signals according to at least one of the following parameters: a) the types of the connectors; b) whether there is a mobile device connected with the connectors; c) a first command from the mobile device; d) the power consumed by the mobile devices; e) the currents flowing through the connectors; and f) the voltages at the connectors.

公开(公告)号：US10476275B2

公开(公告)日：2019-11-12

申请号：US15284643

申请日：2016-10-04

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Chang-Yu Wu ,  Yi-Wei Lee

IPC: H02J3/14 ,  H02J4/00 ,  H02M7/217 ,  H05B37/02 ,  H02M1/08 ,  H02M5/293 ,  H05B33/08

Abstract: The present invention provides a multi-load control apparatus, a slave circuit and a control method thereof. The multi-load control apparatus includes a master circuit and at least one slave circuit. The master circuit generates at least one pulse width modulation (PWM) signal according to an input signal. The slave circuit controls a power switch according to a corresponding PWM signal. The slave circuit has a primary side circuit and a secondary side circuit. The primary side circuit generates an AC PWM signal according to the corresponding PWM signal. The power switch has a control terminal which is driven according to a floating ground level which is not a constant voltage level. The power switch has a current inflow terminal and a current outflow terminal, which are connected to a corresponding load circuit in series, wherein the series circuit of the power switch and the load circuit receives an AC voltage.

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

IPC: H02M3/335 ,  H02M1/36 ,  H02M1/08

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.

公开(公告)号：US09655185B2

公开(公告)日：2017-05-16

申请号：US14920240

申请日：2015-10-22

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Jiun-Hung Pan ,  Tong-Cheng Jao ,  Yi-Wei Lee ,  Isaac Y. Chen

IPC: H05B33/08

CPC classification number: H05B33/083 ,  Y02B20/341 ,  Y02B20/345

Abstract: A linear LED driver comprises a transistor having an input terminal coupled to a LED. When the transistor is turned on, the LED is lighted. The linear LED driver further includes a protection circuit for judging whether an instant high voltage variation occurs or not according to at least one of the voltages of a control terminal and an output terminal of the transistor so as to achieve a protection function.

公开(公告)号：US09451661B2

公开(公告)日：2016-09-20

申请号：US15018309

申请日：2016-02-08

Applicant: Richtek Technology Corporation

Inventor： Tong-Cheng Jao ,  Yi-Wei Lee ,  Jiun-Hung Pan ,  Isaac Y. Chen

IPC: G05F1/00 ,  H05B33/08

CPC classification number: H05B33/0845 ,  H05B33/083

Abstract: A linear LED driver includes a voltage supply terminal providing a driving voltage, at least one first transistor, each of which has an input terminal coupled to a respective LED, and a bleeder circuit. When the voltage of the output terminal of each of the at least one first transistor is lower than a first threshold and a power voltage is higher than a second threshold, the bleeder circuit will generate a bleeder current to discharge the voltage supply terminal so as to prevent the LEDs from flickering. The bleeder circuit detects the voltage of the output terminal of each of the at least one first transistor. Therefore, whether the LEDs are lighted up can be confirmed so that the bleeder current can be provided at properly time point.

Abstract translation: 线性LED驱动器包括提供驱动电压的电压供应端子，至少一个第一晶体管，每个第一晶体管具有耦合到相应LED的输入端子和泄放电路。 当所述至少一个第一晶体管中的每一个的输出端子的电压低于第一阈值并且电源电压高于第二阈值时，所述泄放电路将产生泄放电流以对所述电压供应端子进行放电，以便 防止LED闪烁。 泄放电路检测至少一个第一晶体管中的每一个的输出端子的电压。 因此，可以确认LED是否点亮，从而可以在正确的时间点设置泄放电流。