公开(公告)号：US20240014731A1

公开(公告)日：2024-01-11

申请号：US18346679

申请日：2023-07-03

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Ken Chin ,  Shanglin Mo ,  Shuaibing Wang ,  Liangyun Kang

IPC: H02M1/42 ,  H02M1/00

CPC classification number: H02M1/4233 ,  H02M1/0038

Abstract: A noise suppression method and apparatus for a totem pole power factor correction (PFC) circuit and an electronic device are provided. In response to a determination that an alternating current of the totem pole PFC circuit is switched at a zero crossing, a control signal is sent to a switch that enables a PFC inductor in the totem pole PFC circuit to charge or discharge. After the switch is turned off for a first period of time, the switch is turned on again for a second period of time.

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.