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：US20240333026A1

公开(公告)日：2024-10-03

申请号：US18621415

申请日：2024-03-29

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jun ZHAO ,  Chengliang ZHANG ,  Zhu MAO ,  Yaowei HU ,  Zhixiang HU

IPC: H02J9/06 ,  H02J3/32 ,  H02J3/38 ,  H02M1/00

CPC classification number: H02J9/062 ,  H02J3/32 ,  H02J3/38 ,  H02M1/0067 ,  H02J2300/26

Abstract: A micro inverter and a control method therefor, an uninterruptible power supply, and a power supply system. The micro inverter includes a primary-side winding, a first secondary-side winding, a second secondary-side winding, a first power conversion, a second power conversion circuit and an energy storage buffer circuit. When the micro inverter generates double frequency ripple power, a controller controls the energy storage buffer circuit to perform charging in a first time period, so that energy from the first power conversion circuit is absorbed by using the transformer to perform energy buffering, and controls the energy storage buffer circuit to perform discharging in a second time period, so that energy is transferred to the second power conversion circuit by using the transformer. According to the embodiments, a volume of the micro inverter can be reduced, costs are reduced, and reliability of a power converter is improved.