公开(公告)号：US20180375320A1

公开(公告)日：2018-12-27

申请号：US15909313

申请日：2018-03-01

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Jyun-Che Ho ,  Jo-Yu Wang ,  Isaac Y. Chen

IPC: H02H3/20 ,  H02M3/158 ,  G05F1/62

Abstract: A buck switching regulator includes: a power stage, which includes: an upper-gate switch, a lower-gate switch and an inductor, connected with one another at a switching node; and a supply control switch, controlling the power supply form an output terminal to a load. An overvoltage protection method includes the following steps: (A) sensing a voltage of the switching node, to obtain a switching node voltage; (B) determining whether an overvoltage event occurs in the switching node voltage; and (C) if it is determined yes in the step (B), outputting a protection signal. An overvoltage event is determined directly according to the switching node voltage, not directly according to the output voltage.

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：US10177558B1

公开(公告)日：2019-01-08

申请号：US15909313

申请日：2018-03-01

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Jyun-Che Ho ,  Jo-Yu Wang ,  Isaac Y. Chen

IPC: H02M3/20 ,  H02H3/20 ,  H02M3/158 ,  G05F1/62 ,  G05F5/00 ,  H02M1/00

Abstract: A buck switching regulator includes: a power stage, which includes: an upper-gate switch, a lower-gate switch and an inductor, connected with one another at a switching node; and a supply control switch, controlling the power supply form an output terminal to a load. An overvoltage protection method includes the following steps: (A) sensing a voltage of the switching node, to obtain a switching node voltage; (B) determining whether an overvoltage event occurs in the switching node voltage; and (C) if it is determined yes in the step (B), outputting a protection signal. An overvoltage event is determined directly according to the switching node voltage, not directly according to the output voltage.

公开(公告)号：US20180309385A1

公开(公告)日：2018-10-25

申请号：US15632321

申请日：2017-06-24

Applicant: RICHTEK TECHNOLOGY CORPORATION

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

IPC: H02M7/48 ,  H02M3/156 ,  H02M3/335 ,  G05F1/40 ,  H02M1/36

CPC classification number: H02M7/4807 ,  G05F1/40 ,  H02M1/36 ,  H02M3/156 ,  H02M3/335

Abstract: The invention provides a power conversion device, including: a voltage conversion stage, including a primary side for receiving a rectified voltage and a secondary side for generating a rectified voltage according to the rectified voltage, wherein the primary side includes a primary side switch; a switch control circuit having a startup status and a normal operation status, the switch control circuit being configured to operably provide a control signal to a control terminal of the primary side switch; a startup circuit, providing a current to the control terminal when the switch control circuit is in the startup status, to at least partially conduct the primary side switch; and a slow soft-startup circuit, wherein when the switch control circuit is in the startup status and the output voltage does not reach a predetermined voltage in a first predetermined time period, the slow soft-startup circuit reduces a total current quantity supplied to the control terminal in a second predetermined time period which is after the first predetermined time period.

公开(公告)号：US09966857B2

公开(公告)日：2018-05-08

申请号：US15192187

申请日：2016-06-24

Applicant: Richtek Technology Corporation

Inventor： Jiun-Hung Pan ,  Chien-Fu Tang ,  Jyun-Che Ho ,  Isaac Y. Chen ,  Yu-Chang Chen ,  Jung-Pei Cheng

IPC: H02M3/156 ,  H02M3/335 ,  H02M7/217 ,  H02M1/08 ,  H02M3/157 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M1/08 ,  H02M3/156 ,  H02M3/157 ,  H02M3/33515 ,  H02M3/33523 ,  H02M7/217 ,  H02M2001/0009

Abstract: An AC-to-DC power converter with a BJT as a power switch can set a base current of the BJT by a current setting resistor which is in the outside of a control integrated circuit. Since an output current and a recovery current of the BJT are injected into a sensing resistor, the AC-to-DC power converter can correctly detect an inductor current thereof from the sensing resistor.

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：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。