公开(公告)号：US20240305109A1

公开(公告)日：2024-09-12

申请号：US18583016

申请日：2024-02-21

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Kai GUO ,  Houjian XU ,  Xiaoxiang ZHOU

IPC: H02J3/38 ,  H02M7/483 ,  H02M7/5387

CPC classification number: H02J3/388 ,  H02M7/4835 ,  H02M7/53873

Abstract: A power converter includes a power conversion circuit, a relay, and a controller. The power conversion circuit can be configured to implement conversion from a direct current to an alternating current. The relay can be configured to implement on-grid and off-grid switching. The controller can be configured to control switch-on/off of switches in the power conversion circuit and the relay. When a positive direct current bus has a short circuit to ground, the controller switches off a relay of a corresponding phase when any phase of grid voltage is negative. When a negative direct current bus has a short circuit to ground, the controller switches off a relay of a corresponding phase when any phase of grid voltage is positive.

公开(公告)号：US20230216426A1

公开(公告)日：2023-07-06

申请号：US18180258

申请日：2023-03-08

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fei XU ,  Xinyu YU ,  Kai XIN ,  Xiaoxiang ZHOU ,  Lei SHI ,  Peng JU

IPC: H02M7/483 ,  H02M1/36 ,  H02M1/12

CPC classification number: H02M7/483 ,  H02M1/36 ,  H02M1/126

Abstract: A three-level inverter includes controllable switch components T1 to T6. Each of the controllable switch components includes a parallel connected junction capacitor and an anti-parallel connected diode. A first terminal of T1 is connected to a positive direct current bus, a second terminal of T4 is connected to a negative direct current bus, a second terminal of T1 is connected to first terminals of T2 and T5. A controller is configured to: in a positive half cycle, control T3 to be conducted after T1 is conducted, and control T3 to be disconnected before T1 is conducted next time; and in a negative half cycle, control T2 to be conducted after T4 is conducted, and control T2 to be disconnected before T4 is conducted next time. The three-level inverter can balance voltages of the controllable switch components.