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    Resonant conversion system and control method
    2.
    发明授权
    Resonant conversion system and control method 有权

    公开(公告)号：US11979086B2

    公开(公告)日：2024-05-07

    申请号：US17750645

    申请日：2022-05-23

    Applicant: Huawei Digital Power Technologies Co., Ltd.

    Inventor： Ken Chin ,  Yuanjun Liu ,  Zhixiang Hu ,  Shuaibing Wang

    IPC: H02M3/10 ,  G01R19/12 ,  H02M1/00 ,  H02M3/00

    CPC classification number: H02M3/01 ,  G01R19/12 ,  H02M1/0009 ,  H02M1/0058

    Abstract: This application provides a resonant conversion system, including a controller and a resonant conversion circuit. The resonant conversion circuit includes a high frequency chopper circuit, a resonant cavity, a transformer, and a rectification filter network, and the high frequency chopper circuit includes switches S1 and S2. The controller is configured to: detect a bridge arm midpoint voltage VSW, and determine based on the VSW a current threshold signal used to indicate a current threshold; detect a resonant current on a primary side of the transformer, and compare the resonant current with the current threshold signal to control on/off of the switch S1 or S2 based on the second electrical signal, so that the system operates in an inductive mode to ensure zero voltage switching of the switch, while operating in a state close to a capacitive mode to maximize the use of a gain region.

    High Power Factor Rectifier Circuit and Power Converter
    3.
    发明公开
    High Power Factor Rectifier Circuit and Power Converter 审中-公开

    公开(公告)号：US20230198383A1

    公开(公告)日：2023-06-22

    申请号：US18173416

    申请日：2023-02-23

    Applicant: Huawei Digital Power Technologies Co., Ltd.

    Inventor： Ken Chin ,  Yuanjun Liu ,  Zhixiang Hu ,  Wei Zhang

    IPC: H02M1/42 ,  H02M1/44

    CPC classification number: H02M1/4233 ,  H02M1/44

    Abstract: A high power factor rectifier circuit includes a totem pole power factor correction (PFC) circuit, a sampling resistor, a power suppl a PFC controller, and a filter. The totem pole PFC circuit includes two bridge arm units connected in parallel between a first parallel connection point and a second parallel connection point. One end of the sampling resistor is connected to the first parallel connection point and a first reference ground, and the other end of the sampling resistor is separately connected to a sampling voltage input terminal of the PFC controller and a second reference ground. A grounding terminal of the PFC controller is connected to the first reference ground. A power output terminal of the power supply is connected to a power input terminal of the PFC controller using the filter.

    TOTEM-POLE BRIDGELESS POWER FACTOR CORRECTION CIRCUIT AND POWER ELECTRONICS DEVICE
    4.
    发明公开
    TOTEM-POLE BRIDGELESS POWER FACTOR CORRECTION CIRCUIT AND POWER ELECTRONICS DEVICE 审中-公开

    公开(公告)号：US20230198382A1

    公开(公告)日：2023-06-22

    申请号：US18167624

    申请日：2023-02-10

    Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

    Inventor： Ken Chin ,  Zhixiang Hu ,  Yuanjun Liu

    IPC: H02M1/42 ,  H02M7/217

    CPC classification number: H02M1/4225 ,  H02M7/217

    Abstract: An example of a totem-pole bridgeless power factor correction circuit includes a first drive circuit, a rectifier bridge, an inductor, and a current detection circuit. The rectifier bridge includes a first metal oxide semiconductor (MOS) transistor and a first resistor that are located in a first bridge arm. The first drive circuit is configured to drive, based on a first PWM signal when a voltage of a second output port of an alternating current power supply is a positive voltage, a first port and a second port of the first MOS transistor to turn on the first MOS transistor to enable the alternating current power supply to charge the inductor by using the first MOS transistor. The first resistor is configured to convert a current flowing through the first MOS transistor into a corresponding first voltage signal

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