公开(公告)号：US20240339914A1

公开(公告)日：2024-10-10

申请号：US18747832

申请日：2024-06-19

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Tianqi Hu ,  Hui Shi ,  Libin Hui ,  Chengfei Sun ,  Yufang Xiao

IPC: H02M1/00 ,  G01R31/52 ,  H02M7/00

CPC classification number: H02M1/0009 ,  G01R31/52 ,  H02M7/003

Abstract: A photovoltaic inverter may include a magnetic ring, a leakage current detection winding, a modulation wave circuit, a filter circuit, and a first direct current power supply. The modulation wave circuit includes a first push-pull circuit, a comparator, a second direct current power supply, and a leakage current sampling resistor. The first push-pull circuit includes a first switching transistor and a second switching transistor. The first switching transistor is turned on when the comparator outputs a first level signal. The second switching transistor is turned on when the comparator outputs a second level signal. The comparator outputs a carrier signal. When the leakage current detection winding is in a charging saturation status, a level signal output by the comparator is inverted.