公开(公告)号：US11722001B2

公开(公告)日：2023-08-08

申请号：US17749373

申请日：2022-05-20

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Yanzhong Zhang ,  Haijun Ye ,  Xiaofeng Yao

IPC: H02J7/35 ,  H02J3/38 ,  H02M1/32 ,  H02M7/44

CPC classification number: H02J7/35 ,  H02J3/381 ,  H02M1/32 ,  H02M7/44 ,  H02J2207/20 ,  H02J2207/50 ,  H02J2300/24

Abstract: A pre-charging circuit is provided, including a first switch, a second switch, a diode, a first current-limiting apparatus, a capacitor, and an inverter unit. One end of the pre-charging circuit is connected to a power grid. After the first current-limiting apparatus, the first switch, and the diode are connected in series, one end of a line formed by the series connection is connected to one terminal of the capacitor, the other end of the line is connected to a first-phase alternating current of the power grid, and the other terminal of the capacitor is connected to a second-phase alternating current of the power grid via the inverter unit and the second switch successively.