公开(公告)号：US20240072647A1

公开(公告)日：2024-02-29

申请号：US18497110

申请日：2023-10-30

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Ken CHIN ,  Yuanjun LIU ,  Shanglin MO ,  Liangyun KANG

IPC: H02M1/42 ,  H02M3/158

CPC classification number: H02M1/42 ,  H02M3/158

Abstract: A power supply apparatus includes a totem-pole power factor correction (PFC) circuit and a control apparatus, and the totem-pole PFC circuit includes a first switching transistor and a second switching transistor. The control apparatus includes a controller and a dead time detection circuit, and the dead time detection circuit includes a detection capacitor and a detection resistor. A first end of the detection capacitor is connected to a first reference point, a second end of the detection capacitor is connected to a first end of the detection resistor, and a second end of the detection resistor is grounded. The controller is configured to, respectively, control an on/off status of the first switching transistor and an on/off status of the second switching transistor based on a voltage of the detection resistor and polarity of a voltage input by an alternating current input source.

公开(公告)号：US20240055982A1

公开(公告)日：2024-02-15

申请号：US18497028

申请日：2023-10-30

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Ken CHIN ,  Yuanjun LIU ,  Shanglin MO ,  Liangyun KANG

IPC: H02M1/42 ,  H02M1/00

CPC classification number: H02M1/4208 ,  H02M1/0058 ,  H02M1/0009

Abstract: A power conversion circuit and a power conversion circuit control method. The power conversion circuit determines polarity of an alternating current voltage by using a PFC circuit controller, determines, based on a current of an inductor, a signal for controlling a secondary switch to be turned off, determines, based on a voltage at a midpoint of a series connection between a switching transistor S1 and a switching transistor S2, a signal for controlling the secondary switch to be turned on again and a signal for controlling a primary switch to be turned off, and performs PWM control on the switching transistor S1 and the switching transistor S2.

公开(公告)号：US20220385175A1

公开(公告)日：2022-12-01

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: H02M3/00 ,  H02M1/00 ,  G01R19/12

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.

公开(公告)号：US20220345034A1

公开(公告)日：2022-10-27

申请号：US17728038

申请日：2022-04-25

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Ken CHIN ,  Shanglin MO ,  Yuanjun LIU

IPC: H02M1/42

Abstract: The control system includes a PFC circuit and a sampling control circuit, and the PFC circuit includes an inductor, a first power supply drive circuit, and a first bridge arm and a second bridge arm that are connected in parallel, and a first bridge arm midpoint is a serial connection point between a first upper bridge arm and a first lower bridge arm of the first bridge arm. The sampling control circuit is configured to control, based on voltages of two ends of an alternating current power supply, the first lower bridge arm to be turned on, so that the first power supply drive circuit starts charging. The sampling control circuit is further configured to: when charging duration of the first power supply drive circuit reaches first target duration, control the first lower bridge arm to be turned off, so that the first power supply drive circuit completes charging.