公开(公告)号：US20210328436A1

公开(公告)日：2021-10-21

申请号：US17362119

申请日：2021-06-29

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yongbing GAO ,  Panpan WANG ,  Chengfeng JIANG

IPC: H02J3/38 ,  H02M3/158

Abstract: A photovoltaic converter string is provided, to control, one of switching transistors in a buck/boost circuit of the photovoltaic converter to be conducted, wherein the switching transistors are connected in parallel to a bypass diode; and control the other switching transistors in the buck/boost circuit to be cut off. Therefore, an output voltage of the photovoltaic converter is applied to both ends of the non-conducted switching transistor in the switching transistors connected in parallel to the bypass diode, and after the output voltage of the photovoltaic converter reaches a breakdown voltage of the non-conducted switching transistor, an avalanche breakdown occurs on the non-conducted switching transistor, and a voltage of both ends of the bypass diode connected to a positive output end and a negative output end of the photovoltaic converter is clamped to be less than or equal to the breakdown voltage of the switching transistor.