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1. 发明公开

EP4435454A1 PHOTOVOLTAIC INVERTER AND LEAKAGE CURRENT DETECTION APPARATUS 审中-实审
公开(公告)号：EP4435454A1
公开(公告)日：2024-09-25
申请号：EP24709626.6
申请日：2024-01-12
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： HU, Tianqi , SHI, Hui , HUI, Libin , SUN, Chengfei , XIAO, Yufang
IPC分类号： G01R31/52
CPC分类号： Y02E10/56
摘要： This application provides a photovoltaic inverter and a leakage current detection apparatus. The photovoltaic inverter includes 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, to control the first direct current power supply so that the leakage current detection winding is in a first charging state. The second switching transistor is turned on when the comparator outputs a second level signal, to control the second direct current power supply so that the leakage current detection winding is in a second charging state. 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. The filter circuit filters a voltage signal at two ends of the leakage current sampling resistor based on the carrier signal, to obtain a leakage voltage signal. According to this application, leakage current detection precision can be improved.

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