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.

公开(公告)号：US20220060146A1

公开(公告)日：2022-02-24

申请号：US17519291

申请日：2021-11-04

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Tiansan LIN ,  Peng JU

IPC: H02S40/32 ,  H02S40/34 ,  H02S50/15

Abstract: Embodiments of this application disclose a design of an inverter and a design of a combiner box, to reduce maintenance costs of a photovoltaic device. According to the inverter or the combiner box provided in the embodiments of this application, when electroluminescence (EL) defect detection is performed on the photovoltaic device, a reverse charging circuit integrated into the inverter or integrated into the combiner box is used to output a direct current to a to-be-tested photovoltaic string of the photovoltaic device. Whether the to-be-tested photovoltaic string has defects is determined based on a light emission status of the to-be-tested photovoltaic string. By using the foregoing designs, maintenance engineers do not need to modify wiring terminals of the photovoltaic device when performing EL defect tests on the photovoltaic device. This helps reduce maintenance costs of the photovoltaic device.