公开(公告)号：US12301123B2

公开(公告)日：2025-05-13

申请号：US17965370

申请日：2022-10-13

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Lei Miao ,  Siran Wang

IPC: H02M3/335 ,  H02M1/00

Abstract: A method to control a synchronous rectifier (SR) switch in a switching power supply circuit having an energy storage component coupled to the SR switch, the method is: generating a turning-ON control signal by comparing a drain-source sensing voltage of the SR switch with a turn ON threshold voltage; limiting an ON-time of the SR switch at least not less than a minimum on-time when the turning-ON control signal is asserted and an indicium signal having a first level indicating a fast mode; and removing the minimum on-time limitation to the SR switch and turning OFF the SR switch responsive to the drain-source sensing voltage of the SR switch exceeding a turn OFF threshold voltage when the turning-ON control signal is asserted and the indicium signal having a second level indicating a slow mode.

公开(公告)号：US20210175817A1

公开(公告)日：2021-06-10

申请号：US16953700

申请日：2020-11-20

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Lei Miao ,  Siran Wang

IPC: H02M3/335 ,  H02M1/08

Abstract: A switching power supply circuit with synchronous rectification has an energy storage component, a SR switch coupled to a secondary side of the energy storage component, and a secondary control circuit. The secondary control circuit has a turning-ON control circuit for providing a turning-ON control signal based on a comparison of a drain to source sensing voltage of the SR switch and a turn ON threshold, a mode determination circuit for providing a mode signal to determine a turn ON delay based on a detection to a transient event or the drain to source sensing voltage ringing of the SR switch, and a gate driver circuit for driving the SR switch. When the turning-ON control signal is asserted, the gate driver circuit charges a gate voltage of the SR switch after the turn ON delay based on the mode signal, to turn ON the SR switch.

公开(公告)号：US10951124B2

公开(公告)日：2021-03-16

申请号：US16719969

申请日：2019-12-18

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Hui Li ,  Siran Wang ,  Lei Miao

IPC: H02M3/335 ,  H02M1/08 ,  H02M1/00

Abstract: A switching power supply circuit has an energy storage component, a synchronous rectifier switch and a synchronous rectifier control circuit. The synchronous rectifier switch is coupled to a secondary side of the energy storage component, and the synchronous rectifier control circuit turns ON the synchronous rectifier switch based on a drain-source voltage across the synchronous rectifier switch when a primary switch is judged as turned ON. When the switching power supply circuit is not operating in a preset mode, the primary switch is judged as turned ON when the drain-source voltage remains larger than a dynamic reference voltage during a preset window time period, and when the switching power supply circuit is operating in the preset mode, the primary switch is judged as turned ON once the drain-source voltage is larger than the dynamic reference voltage.

公开(公告)号：US20200233442A1

公开(公告)日：2020-07-23

申请号：US16748527

申请日：2020-01-21

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Lei Miao ,  Long Li ,  Siran Wang

IPC: G05F1/575 ,  G01R31/40 ,  G05B19/042 ,  G06F1/26 ,  H02M3/157

Abstract: A test method of a voltage regulator having a plurality of parameters that need to be set, the test method includes: receiving a user requirement on a computer; generating a plurality of setting combinations of the plurality of parameters, the plurality of parameters has different combination of values in different setting combinations; downloading the plurality of setting combinations to the voltage regulator via a first I/O bus and configuring the voltage regulator with each setting combination; configuring communication between a controller provided by the computer and measurement devices; executing the communication between the controller and the measurement devices via a second I/O bus; and displaying test result of each configured voltage regulator on the computer.

公开(公告)号：US10673344B2

公开(公告)日：2020-06-02

申请号：US16195712

申请日：2018-11-19

Applicant: Chengdu Monolithic Power Systems Co. Ltd.

Inventor： Siran Wang

IPC: H02M3/335 ,  H02M1/00

Abstract: A switching power supply circuit with synchronous rectifier has an energy storage component, a rectifier switch coupled to a secondary side of the energy storage component, and a secondary side control circuit. The secondary side control circuit provides a driving signal to control the rectifier switch. When the drain-source voltage across the rectifier switch is less than a first threshold value, the secondary side control circuit controls the driving signal to be a maximum voltage to control the rectifier switch being fully on for a predetermined duration. After a predetermined duration, the secondary side control circuit adjusts the voltage of the driving signal based on the drain-source voltage across the rectifier switch and a second threshold value.

公开(公告)号：US20200161985A1

公开(公告)日：2020-05-21

申请号：US16719969

申请日：2019-12-18

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Hui Li ,  Siran Wang ,  Lei Miao

IPC: H02M3/335 ,  H02M1/08

Abstract: A switching power supply circuit has an energy storage component, a synchronous rectifier switch and a synchronous rectifier control circuit. The synchronous rectifier switch is coupled to a secondary side of the energy storage component, and the synchronous rectifier control circuit turns ON the synchronous rectifier switch based on a drain-source voltage across the synchronous rectifier switch when a primary switch is judged as turned ON. When the switching power supply circuit is not operating in a preset mode, the primary switch is judged as turned ON when the drain-source voltage remains larger than a dynamic reference voltage during a preset window time period, and when the switching power supply circuit is operating in the preset mode, the primary switch is judged as turned ON once the drain-source voltage is larger than the dynamic reference voltage.

公开(公告)号：US20150207420A1

公开(公告)日：2015-07-23

申请号：US14601791

申请日：2015-01-21

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Siran Wang ,  Yuancheng Ren

IPC: H02M3/335

CPC classification number: H02M3/33507

Abstract: A switching mode power supply (SMPS) includes a transformer having a primary winding, a secondary winding for providing an output voltage and an auxiliary winding, a primary switch coupled to the primary winding, a secondary rectifying diode coupled to the secondary winding and a secondary switch connected in parallel with the secondary rectifying diode. A control method used in the SMPS includes: comparing a voltage across the secondary switch with a first secondary threshold and a second secondary threshold and generating a hysteresis comparison signal; timing based on the hysteresis comparison signal; comparing the voltage across the secondary switch with a third secondary threshold when the timing period reaches a first predetermined time; turning ON the secondary switch when the voltage across the secondary switch is less than a third secondary threshold; and turning on the primary switch when the conduction of the secondary switch is detected.

Abstract translation: 开关模式电源（SMPS）包括具有初级绕组的变压器，用于提供输出电压的次级绕组和辅助绕组，耦合到初级绕组的初级开关，耦合到次级绕组的次级整流二极管和次级绕组 开关与二次整流二极管并联连接。 SMPS中使用的控制方法包括：将次级开关上的电压与第一辅助阈值和第二辅助阈值进行比较并产生滞后比较信号; 基于滞后比较信号的定时; 当所述定时周期达到第一预定时间时，将所述次级开关上的电压与第三辅助阈值进行比较; 当二次开关上的电压小于第三次级阈值时，接通次级开关; 并且当检测到二次开关的导通时，接通初级开关。

公开(公告)号：US20130301310A1

公开(公告)日：2013-11-14

申请号：US13889255

申请日：2013-05-07

Applicant: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.

Inventor： Siran Wang ,  Junming Zhang ,  Yuancheng Ren

IPC: H02M7/217

CPC classification number: H02M7/217 ,  H02M3/33523

Abstract: An isolated switching mode power supply, having: an input terminal; an output terminal; a transformer having a primary winding and a secondary winding; a primary power switch coupled to the primary winding; a secondary power switch coupled between the secondary winding and the output terminal of the power supply; a secondary controller configured to generate a frequency modulation signal based on the output voltage and the first feedback signal; a coupled device configured to provide a frequency control signal based on the output voltage and the frequency modulation signal; and a primary controller configured to provide a switching signal to control the primary power switch based on the current sense signal and the frequency control signal.

Abstract translation: 一种隔离开关电源，具有：输入端子; 输出端子; 具有初级绕组和次级绕组的变压器; 耦合到初级绕组的主电源开关; 二次电源开关，其耦合在所述次级绕组和所述电源的输出端子之间; 二次控制器，被配置为基于所述输出电压和所述第一反馈信号生成频率调制信号; 耦合器件，被配置为基于所述输出电压和所述频率调制信号来提供频率控制信号; 以及主控制器，被配置为基于所述电流检测信号和所述频率控制信号来提供开关信号以控制所述主电源开关。

公开(公告)号：US20230275505A1

公开(公告)日：2023-08-31

申请号：US18155438

申请日：2023-01-17

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Guangzhuo Li ,  Pengfei Liu ,  Siran Wang

IPC: H02M1/32 ,  H02M1/00 ,  H02M1/42

CPC classification number: H02M1/32 ,  H02M1/0009 ,  H02M1/4208

Abstract: An over-current protection circuit has a current sensing circuit, an over-current comparing circuit, an isolation circuit and a control circuit. The current sensing circuit generates a current sensing signal based on a current flowing through an inductor of a voltage converter. The over-current comparing circuit receives the current sensing signal and generates a first over-current indication signal based on the current sensing signal. The isolation circuit receives the first over-current indication signal and generates a second over-current indication signal based on the first over-current indication signal. The control circuit receives the second over-current indication signal, and generates a control signal to control a switch of the voltage converter. The control circuit turns off the switch when the second over-current indication signal indicates that an over-current condition occurs.

公开(公告)号：US20230223855A1

公开(公告)日：2023-07-13

申请号：US18184202

申请日：2023-03-15

Applicant: Chengdu Monolithic Power Systems Co., Ltd.

Inventor： Siran Wang ,  Pengfei Liu ,  Yuzhou Zhang

IPC: H02M3/335 ,  H02M3/337 ,  H02M1/00

CPC classification number: H02M3/33569 ,  H02M3/3376 ,  H02M1/0009

Abstract: A control circuit for a resonant circuit includes a resonant current detecting circuit, a current adjustment circuit and an on-time control circuit. The resonant current detecting circuit is configured to receive a resonant current, a first reference and a second reference, and to provide a detected current signal based on the resonant current, the first reference and the second reference. The current adjustment circuit is configured to receive the detected current signal and a charging reference, and to provide an on-time control signal based on the detected current signal and the charging reference. The on-time control circuit is configured to receive the on-time control signal and an on-time initial value, and to provide an on-time signal to control a switch of the resonant circuit based on the on-time control signal and the on-time initial value.