公开(公告)号：US20210376713A1

公开(公告)日：2021-12-02

申请号：US16924212

申请日：2020-07-09

Applicant: Power Forest Technology Corporation

Inventor： Po-Jen Ke

IPC: H02M1/36 ,  H02M3/335

Abstract: A power conversion apparatus and a charging method of the power conversion apparatus are provided. A synchronous rectifier controller provides a voltage of a drain terminal of a synchronous rectifier transistor to charge a capacitor of a power supply terminal of the synchronous rectifier controller when the synchronous rectifier transistor is turned from an on state to an off state and a voltage of the power supply terminal is less than a preset voltage.

公开(公告)号：US10177649B1

公开(公告)日：2019-01-08

申请号：US15694875

申请日：2017-09-04

Applicant: Power Forest Technology Corporation

Inventor： Po-Jen Ke

IPC: H02M1/32 ,  H02M3/335

Abstract: A power conversion apparatus and a synchronous rectification (SR) circuit thereof are provided. The power conversion apparatus includes a transformer and the SR circuit. A primary winding of the transformer receives an input voltage. A secondary winding of the transformer provides an output voltage to an output terminal. The SR circuit includes a SR transistor and a SR controller. The SR transistor is coupled between the secondary winding and the output terminal and controlled by a control signal. The SR controller is coupled to the SR transistor to receive a first detecting signal, and generates the control signal according to the first detecting signal. When the SR controller detects that the SR circuit is abnormal, the SR controller generates the controller signal to keep the SR transistor at an on state so as to perform an abnormal protection on the SR circuit.

公开(公告)号：US09077176B2

公开(公告)日：2015-07-07

申请号：US13845099

申请日：2013-03-18

Applicant: Power Forest Technology Corporation

Inventor： Po-Jen Ke ,  Yun-Chi Chiang ,  Tso-Min Chen

IPC: H02M3/335 ,  H02H7/12 ,  H02M1/32 ,  H02H7/122 ,  H02M1/00

CPC classification number: H02H7/1213 ,  H02H7/122 ,  H02M1/32 ,  H02M3/33507 ,  H02M3/33523 ,  H02M2001/0022 ,  H02M2001/327

Abstract: A flyback-based power conversion apparatus and a power conversion method thereof are provided. By switching first and second detection switches disposed in a control chip and coupled to a multi-function pin of the control chip at different timings, the present invention applies a collocation of a voltage-current detection auxiliary circuit and a current detection circuit at a certain timing to execute a detection of the AC input voltage received by a flyback power conversion circuit, and the present invention applies a collocation of the auxiliary voltage-current detection circuit, an over temperature protection unit and an over voltage protection unit at another timing to execute detections of an over temperature protection and an over voltage protection. As the result, a single multi-function detection pin of the control pin is corresponding to a plurality of related function detections, so as to reduce the production cost of manufacturing the control chip.

Abstract translation: 提供了一种基于反激的电力转换装置及其电力转换方法。 通过切换设置在控制芯片中的第一和第二检测开关，并以不同的定时耦合到控制芯片的多功能引脚，本发明将某一电压电流检测辅助电路和电流检测电路的配置 定时执行由反激式电力转换电路接收的交流输入电压的检测，本发明在另一时刻应用辅助电压电流检测电路，过温保护单元和过电压保护单元的搭配来执行 检测过温保护和过压保护。 结果，控制引脚的单个多功能检测引脚对应于多个相关的功能检测，从而降低制造控制芯片的生产成本。

公开(公告)号：US11290002B2

公开(公告)日：2022-03-29

申请号：US16924212

申请日：2020-07-09

Applicant: Power Forest Technology Corporation

Inventor： Po-Jen Ke

IPC: H02M1/36 ,  H02M3/335

Abstract: A power conversion apparatus and a charging method of the power conversion apparatus are provided. A synchronous rectifier controller provides a voltage of a drain terminal of a synchronous rectifier transistor to charge a capacitor of a power supply terminal of the synchronous rectifier controller when the synchronous rectifier transistor is turned from an on state to an off state and a voltage of the power supply terminal is less than a preset voltage.

公开(公告)号：US09906138B2

公开(公告)日：2018-02-27

申请号：US14623501

申请日：2015-02-17

Applicant: Power Forest Technology Corporation

Inventor： Po-Jen Ke

IPC: H02M3/335 ,  H02M1/32

CPC classification number: H02M3/33507 ,  H02M1/32

Abstract: A power conversion apparatus including a flyback power conversion circuit, a control chip and a detection auxiliary circuit is provided. The flyback power conversion circuit receives and converts an input voltage into a DC output voltage. The control chip generates a PWM signal in response to a power supplying requirement to control the operation of the flyback power conversion circuit, wherein the control chip has a single multi-function detection pin. The detection auxiliary circuit assists the control chip to obtain a first detection voltage via the multi-function detection pin, such that the control chip performs a detection of an over temperature protection (OTP) and a detection of an over voltage protection (OVP) synchronously according to the first detection voltage. The first detection voltage is related to the DC output voltage or a thermal voltage of an environment temperature.

公开(公告)号：US20190013727A1

公开(公告)日：2019-01-10

申请号：US15694875

申请日：2017-09-04

Applicant: Power Forest Technology Corporation

Inventor： Po-Jen Ke

IPC: H02M1/32 ,  H02M3/335 ,  H02M1/08

Abstract: A power conversion apparatus and a synchronous rectification (SR) circuit thereof are provided. The power conversion apparatus includes a transformer and the SR circuit. A primary winding of the transformer receives an input voltage. A secondary winding of the transformer provides an output voltage to an output terminal. The SR circuit includes a SR transistor and a SR controller. The SR transistor is coupled between the secondary winding and the output terminal and controlled by a control signal. The SR controller is coupled to the SR transistor to receive a first detecting signal, and generates the control signal according to the first detecting signal. When the SR controller detects that the SR circuit is abnormal, the SR controller generates the controller signal to keep the SR transistor at an on state so as to perform an abnormal protection on the SR circuit.

公开(公告)号：US20140016378A1

公开(公告)日：2014-01-16

申请号：US13845099

申请日：2013-03-18

Applicant: POWER FOREST TECHNOLOGY CORPORATION

Inventor： Po-Jen Ke ,  Yun-Chi Chiang ,  Tso-Min Chen

IPC: H02H7/12 ,  H02M3/335

CPC classification number: H02H7/1213 ,  H02H7/122 ,  H02M1/32 ,  H02M3/33507 ,  H02M3/33523 ,  H02M2001/0022 ,  H02M2001/327

Abstract: A flyback-based power conversion apparatus and a power conversion method thereof are provided. By switching first and second detection switches disposed in a control chip and coupled to a multi-function pin of the control chip at different timings, the present invention applies a collocation of a voltage-current detection auxiliary circuit and a current detection circuit at a certain timing to execute a detection of the AC input voltage received by a flyback power conversion circuit, and the present invention applies a collocation of the auxiliary voltage-current detection circuit, an over temperature protection unit and an over voltage protection unit at another timing to execute detections of an over temperature protection and an over voltage protection. As the result, a single multi-function detection pin of the control pin is corresponding to a plurality of related function detections, so as to reduce the production cost of manufacturing the control chip.

Abstract translation: 提供了一种基于反激的电力转换装置及其电力转换方法。 通过切换设置在控制芯片中的第一和第二检测开关，并以不同的定时耦合到控制芯片的多功能引脚，本发明将某一电压电流检测辅助电路和电流检测电路的配置 定时执行由反激式电力转换电路接收的交流输入电压的检测，本发明在另一时刻应用辅助电压电流检测电路，过温保护单元和过电压保护单元的搭配来执行 检测过温保护和过压保护。 结果，控制引脚的单个多功能检测引脚对应于多个相关的功能检测，从而降低制造控制芯片的生产成本。

公开(公告)号：US10340802B1

公开(公告)日：2019-07-02

申请号：US16114257

申请日：2018-08-28

Applicant: Power Forest Technology Corporation

Inventor： Po-Jen Ke

IPC: H02M3/158 ,  H02M1/34 ,  H02M1/00 ,  H02M7/219

Abstract: A power conversion apparatus including a synchronous rectification (SR) transistor, a SR controller and a snubber circuit is provided. The SR controller is coupled to the SR transistor to control the SR transistor. A ground terminal of the SR controller is coupled to a source terminal of the SR transistor, and a power terminal of the SR controller is coupled to a system voltage. A first terminal of the snubber circuit is coupled to a drain terminal of the SR transistor. A second terminal of the snubber circuit is coupled to the power terminal of the SR controller. The snubber circuit obtains power from the drain terminal of the SR transistor and provides the system voltage accordingly.

公开(公告)号：US20170229973A1

公开(公告)日：2017-08-10

申请号：US15161300

申请日：2016-05-23

Applicant: Power Forest Technology Corporation

Inventor： Po-Jen Ke

IPC: H02M3/335

CPC classification number: H02M3/33592 ,  H02M3/33507 ,  Y02B70/1475

Abstract: A power conversion apparatus includes a power conversion circuit, a synchronous rectification transistor, a synchronous rectification control circuit, a feedback circuit, and a cable loss compensation circuit. The power conversion circuit converts an input voltage into an output voltage and provides it to a load. The synchronous rectification transistor is coupled in series to a current path on a secondary side of the power conversion circuit and switched according to a synchronous rectification control signal. The synchronous rectification control circuit generates the synchronous rectification control signal for controlling the switching of the synchronous rectification transistor. The feedback circuit generates an output indication current associated with the output voltage. The cable loss compensation circuit draws a compensation current from the feedback circuit according to the synchronous rectification control signal, so as to compensate for the output voltage based on a sum of the compensation current and the output indication current.

公开(公告)号：US09729073B1

公开(公告)日：2017-08-08

申请号：US15161300

申请日：2016-05-23

Applicant: Power Forest Technology Corporation

Inventor： Po-Jen Ke

IPC: H02M3/335

CPC classification number: H02M3/33592 ,  H02M3/33507 ,  Y02B70/1475

Abstract: A power conversion apparatus includes a power conversion circuit, a synchronous rectification transistor, a synchronous rectification control circuit, a feedback circuit, and a cable loss compensation circuit. The power conversion circuit converts an input voltage into an output voltage and provides it to a load. The synchronous rectification transistor is coupled in series to a current path on a secondary side of the power conversion circuit and switched according to a synchronous rectification control signal. The synchronous rectification control circuit generates the synchronous rectification control signal for controlling the switching of the synchronous rectification transistor. The feedback circuit generates an output indication current associated with the output voltage. The cable loss compensation circuit draws a compensation current from the feedback circuit according to the synchronous rectification control signal, so as to compensate for the output voltage based on a sum of the compensation current and the output indication current.