公开(公告)号：US11088624B2

公开(公告)日：2021-08-10

申请号：US16831835

申请日：2020-03-27

Applicant: Power Forest Technology Corporation

Inventor： Tso-Min Chen

IPC: H02M3/335 ,  H02M3/155

Abstract: A voltage conversion apparatus for implementing zero-voltage switching based on recovering leakage inductance energy is provided. A leakage inductance energy recovery circuit is coupled to a primary side auxiliary winding and a control circuit, and recovers leakage inductance energy of a transformer circuit to supply an operating power to the control circuit. Before a main switch is turned on the next time, leakage inductance energy recovered previously is used to lower a cross-voltage of the main switch, so that transient loss of conduction of the main switch is eliminated or reduced, and circuit efficiency is improved.

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：US20210036609A1

公开(公告)日：2021-02-04

申请号：US16831835

申请日：2020-03-27

Applicant: Power Forest Technology Corporation

Inventor： Tso-Min Chen

IPC: H02M3/155 ,  H01F27/34

Abstract: A voltage conversion apparatus is provided. A leakage inductance energy recovery circuit is coupled to a primary side auxiliary winding and a control circuit, and recovers leakage inductance energy of a transformer circuit to supply an operating power to the control circuit. Before a main switch is turned on the next time, leakage inductance energy recovered previously is used to lower a cross-voltage of the main switch, so that transient loss of conduction of the main switch is eliminated or reduced, and circuit efficiency is improved.

公开(公告)号：US09479069B2

公开(公告)日：2016-10-25

申请号：US14274780

申请日：2014-05-12

Applicant: Power Forest Technology Corporation

Inventor： Tso-Min Chen

IPC: H02M1/32 ,  H02M3/335

CPC classification number: H02M3/33523 ,  H02M1/32 ,  H02M2001/327

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 AC input voltage into a DC output voltage. The control chip generates a PWM signal in response to a power supply requirement to control operations of the flyback power conversion circuit, and the control chip has a multi-function detection pin. The detection auxiliary circuit assists the control chip to obtain an auxiliary voltage related to the DC output voltage via the multi-function detection pin, and thereby determines a transition time of the PWM signal according to the auxiliary voltage. Besides, the detection auxiliary circuit assists the control chip to execute detections of an over temperature protection (OTP) and an over voltage protection (OVP) via the multi-function detection pin respectively within first and second detection phases.

Abstract translation: 提供一种包括反激式电力转换电路，控制芯片和检测辅助电路的电力转换装置。 回扫电力转换电路接收并将AC输入电压转换为DC输出电压。 控制芯片根据用于控制反激式功率转换电路的动作的电源要求生成PWM信号，控制芯片具有多功能检测引脚。 检测辅助电路通过多功能检测引脚帮助控制芯片获得与直流输出电压相关的辅助电压，从而根据辅助电压确定PWM信号的转换时间。 此外，检测辅助电路有助于控制芯片分别在第一和第二检测阶段通过多功能检测引脚执行过温保护（OTP）和过压保护（OVP）的检测。

公开(公告)号：US20150295496A1

公开(公告)日：2015-10-15

申请号：US14274780

申请日：2014-05-12

Applicant: Power Forest Technology Corporation

Inventor： Tso-Min Chen

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M1/32 ,  H02M2001/327

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 AC input voltage into a DC output voltage. The control chip generates a PWM signal in response to a power supply requirement to control operations of the flyback power conversion circuit, and the control chip has a multi-function detection pin. The detection auxiliary circuit assists the control chip to obtain an auxiliary voltage related to the DC output voltage via the multi-function detection pin, and thereby determines a transition time of the PWM signal according to the auxiliary voltage. Besides, the detection auxiliary circuit assists the control chip to execute detections of an over temperature protection (OTP) and an over voltage protection (OVP) via the multi-function detection pin respectively within first and second detection phases.

Abstract translation: 提供一种包括反激式电力转换电路，控制芯片和检测辅助电路的电力转换装置。 回扫电力转换电路接收并将AC输入电压转换为DC输出电压。 控制芯片根据用于控制反激式功率转换电路的动作的电源要求生成PWM信号，控制芯片具有多功能检测引脚。 检测辅助电路通过多功能检测引脚帮助控制芯片获得与直流输出电压相关的辅助电压，从而根据辅助电压确定PWM信号的转换时间。 此外，检测辅助电路有助于控制芯片分别在第一和第二检测阶段通过多功能检测引脚执行过温保护（OTP）和过压保护（OVP）的检测。

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。