公开(公告)号：US20160043628A1

公开(公告)日：2016-02-11

申请号：US14548290

申请日：2014-11-20

Applicant: Power Forest Technology Corporation

Inventor： Yun-Chi Chiang

IPC: H02M1/32 ,  H02M7/217 ,  H02M1/36

CPC classification number: H02M1/32 ,  H02M1/36 ,  H02M3/156 ,  H02M7/217

Abstract: A power conversion apparatus and a protection method of the power conversion apparatus while a feedback current signal of the power conversion apparatus is abnormal are provided. The protection method includes a step of stopping switching a power switch if a duty cycle of a pulse width modulation signal is continuously greater than a preset duty cycle for at least one signal cycle and a voltage of a current sensing signal is smaller than a preset voltage level during the at least one signal cycle.

Abstract translation: 提供了电力转换装置的反馈电流信号异常时的电力变换装置和电力转换装置的保护方法。 该保护方法包括：如果脉冲宽度调制信号的占空比连续地大于至少一个信号周期的预设占空比并且电流感测信号的电压小于预设电压，则停止切换电源开关的步骤 在至少一个信号周期期间。

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：US09148050B2

公开(公告)日：2015-09-29

申请号：US13941540

申请日：2013-07-14

Applicant: Power Forest Technology Corporation

Inventor： Yun-Chi Chiang

IPC: H02M1/00 ,  H02M1/36 ,  H02M7/217

CPC classification number: H02M1/36 ,  H02M7/217

Abstract: An AC/DC converting circuit and a starting method thereof are provided. An AC detection or a rectified AC voltage detection is disabled when the AC voltage or the rectified AC voltage not up to a start-up voltage is detected, so as to shorten a recovery time of a voltage of a power supply terminal of an AC/DC power conversion controller, and further shorten a starting time of the AC/DC converting circuit.

Abstract translation: 提供一种AC / DC转换电路及其启动方法。 当检测到交流电压或整流的交流电压不达到启动电压时，交流检测或整流的交流电压检测被禁用，以缩短交流/交流电压的电源端的电压的恢复时间， DC电源转换控制器，进一步缩短AC / DC转换电路的启动时间。

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：US11916487B2

公开(公告)日：2024-02-27

申请号：US17702813

申请日：2022-03-24

Applicant: Power Forest Technology Corporation

Inventor： Chao-Chang Chiu ,  Kuan-Chun Fang ,  Yueh-Chang Chen ,  Tzu-Chi Huang ,  Che-Hao Meng

IPC: H02M3/335 ,  H02M1/00

CPC classification number: H02M3/33569 ,  H02M1/0009

Abstract: An asymmetric half-bridge converter is provided. The asymmetric half-bridge converter includes a switch circuit, a resonance tank, a current sensor, and a controller. The current sensor senses a waveform of a resonance current flowing through the resonance tank to generate a sensing result. The controller determines the sensing result. When the sensing result indicates that an ending current value of a primary resonance waveform of the resonance current is greater than a predetermined value, the controller performs a first switching operation on the switch circuit. When the sensing result indicates that the ending current value of the primary resonance waveform is less than or equal to the predetermined value, the controller performs a second switching operation on the switch circuit.

公开(公告)号：US20240048065A1

公开(公告)日：2024-02-08

申请号：US17963172

申请日：2022-10-10

Applicant: Power Forest Technology Corporation

Inventor： Chia-Hsien Liu

IPC: H02M7/04 ,  H02M7/219 ,  H02M1/08

CPC classification number: H02M7/05 ,  H02M7/219 ,  H02M1/08

Abstract: A power conversion device and a control circuit are provided. The power conversion device includes a power conversion circuit and a control circuit. The control circuit includes a first controller and a second controller. The power conversion circuit includes an input capacitor, a rectifier circuit, and a power switch. The input capacitor is coupled to an input terminal of the power conversion device. The rectifier circuit converts an input AC power into a rectified power. The first controller operates the power switch to cause the power conversion circuit to convert the rectified power into an output power. The second controller detects a signal waveform at the input terminal, and controls the first controller in response to the signal waveform at the input terminal, so as to utilize the power switch to discharge the charge stored in the input capacitor.

公开(公告)号：US11742769B2

公开(公告)日：2023-08-29

申请号：US17488335

申请日：2021-09-29

Applicant: Power Forest Technology Corporation

Inventor： Chia-Hsien Liu

IPC: H02M3/335 ,  H02M1/08

CPC classification number: H02M3/33592 ,  H02M1/08

Abstract: A power conversion apparatus and a synchronous rectification controller thereof are provided. At least one of a differentiation operation and an integration operation is performed on a drain voltage signal of a synchronous rectification transistor. According to at least one of a differential signal obtained by performing the differential operation and an integral signal obtained by performing the integral operation, it is determined whether to turn on the synchronous rectification transistor at the next time when the drain voltage signal is less than or equal to a turn-on threshold voltage.

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.