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公开(公告)号：US12206337B2
公开(公告)日：2025-01-21
申请号：US17963172
申请日：2022-10-10
Applicant: Power Forest Technology Corporation
Inventor： Chia-Hsien Liu
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.
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公开(公告)号：US12191759B2
公开(公告)日：2025-01-07
申请号：US18085587
申请日：2022-12-21
Applicant: Power Forest Technology Corporation
Inventor： Chia-Hsien Liu
Abstract: A detection circuit for a power supply circuit is provided. The detection circuit includes a reference circuit, a voltage detection circuit, and a determination circuit. The reference circuit is coupled to a thermal circuit of the power supply circuit through a connection pin. The voltage detection circuit stops the reference circuit from providing a temperature reference signal, and samples a single-phase AC input power through the connection pin. When a peak value information of the single-phase AC input power is sampled, the voltage detection circuit stores the peak value information and enables the reference circuit to provide the temperature reference signal. The determination circuit provides at least one of a waveform detection signal and an over-voltage detection signal in response to the peak value information, and provides an over-temperature detection signal according to at least one of an output signal of the thermal circuit and the peak value information.
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公开(公告)号：US12113434B2
公开(公告)日：2024-10-08
申请号：US17308064
申请日：2021-05-05
Applicant: Power Forest Technology Corporation
Inventor： Chia-Hsien Liu
CPC classification number: H02M1/322 , H02J7/0048 , H02J7/007182 , H02M3/335 , H02J7/345 , H02M1/32 , H02M7/062
Abstract: A power supply apparatus and a discharge method thereof are provided. A control unit detects a cross-voltage across two ends of an AC safety capacitor to generate a detection voltage, compares the detection voltage with a threshold voltage, counts the number of cycles of the detection voltage during a period when the detection voltage does not cross the threshold voltage according to a comparison result between the detection voltage and the threshold voltage, and performs a discharge operation when the number of cycles is greater than or equal to a predetermined value to discharge electric energy stored in the AC safety capacitor.
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公开(公告)号：US11930573B2
公开(公告)日：2024-03-12
申请号：US17960140
申请日：2022-10-05
Applicant: Power Forest Technology Corporation
Inventor： Rong-Jie Tu , Hung-Chih Chiu , Chien-Lung Lee
IPC: H02M1/00 , H02J3/00 , H02J3/14 , H05B45/3725
CPC classification number: H05B45/3725 , H02J3/0075 , H02J3/14 , H02M1/0009 , H02M1/0083
Abstract: A power supply device is provided. The power supply device includes a power converter and a controller. The controller controls the power converter to generate an output power. The controller includes a first detection circuit and a second detection circuit. The first detection circuit detects the output power to obtain a first detection result. The first detection result is a variation of an output current value of the output power. The second detection circuit detects electrical characteristics other than the output current value to obtain a second detection result. The controller determines whether to limit output of the output power according to a relationship between the first detection result and the second detection result.
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公开(公告)号：US20230209678A1
公开(公告)日：2023-06-29
申请号：US17960140
申请日：2022-10-05
Applicant: Power Forest Technology Corporation
Inventor： Rong-Jie Tu , Hung-Chih Chiu , Chien-Lung Lee
IPC: H05B45/3725 , H02M1/00
CPC classification number: H05B45/3725 , H02M1/0009 , H02M1/0083
Abstract: A power supply device is provided. The power supply device includes a power converter and a controller. The controller controls the power converter to generate an output power. The controller includes a first detection circuit and a second detection circuit. The first detection circuit detects the output power to obtain a first detection result. The first detection result is a variation of an output current value of the output power. The second detection circuit detects electrical characteristics other than the output current value to obtain a second detection result. The controller determines whether to limit output of the output power according to a relationship between the first detection result and the second detection result.
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Patent Agency Ranking
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
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.
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公开(公告)号：US20210226541A1
公开(公告)日：2021-07-22
申请号：US16790767
申请日：2020-02-14
Applicant: Power Forest Technology Corporation
Inventor： Wen-Sheng Wang , Chia-Hsien Liu
Abstract: A voltage conversion apparatus and a voltage conversion method thereof are provided. A conversion circuit converts outputs of a plurality of secondary windings to generate a conversion voltage or a conversion current to a resistor network of a feedback circuit to thereby change impedance characteristics of the resistor network. The feedback circuit adjusts a feedback voltage in response to the change in the impedance characteristics of the resistor network, so that a control circuit controls an output of a transformer circuit according to the feedback voltage.
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68.发明申请公开(公告)号：US20210036693A1
公开(公告)日：2021-02-04
申请号：US16558333
申请日：2019-09-03
Applicant: Power Forest Technology Corporation
Inventor： Yueh-Chang Chen
Abstract: A pulse width modulation control circuit and a control method of a pulse width modulation signal are provided. A counter circuit generates a count value according to a phase-locked loop clock, and resets the count value according to a transition point of a synchronization signal. A comparison circuit compares the count value with a duty ratio set value, and sets the pulse width modulation signal to a high level while the count value is less than the duty ratio set value.
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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
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.
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70.发明授权公开(公告)号：US09729043B2
公开(公告)日：2017-08-08
申请号：US14548290
申请日：2014-11-20
Applicant: Power Forest Technology Corporation
Inventor： Yun-Chi Chiang
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.
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