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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.

2. 发明公开

EP4418514A1 PHOTOVOLTAIC INVERTER AND POWER CONTROL METHOD 审中-实审
公开(公告)号：EP4418514A1
公开(公告)日：2024-08-21
申请号：EP23741244.0
申请日：2023-01-10
申请人： Huawei Digital Power Technologies Co., Ltd.
发明人： HUI, Libin , SHI, Hui , HU, Tianqi , TAN, Xiaojin , CHEN, Hu
IPC分类号： H02M1/32 , H02M1/00 , H02M3/156 , H02H7/12
CPC分类号： Y02E10/56
摘要： This application provides a photovoltaic inverter and a power control method. The photovoltaic inverter includes an inverter circuit, a plurality of voltage conversion circuits, a plurality of acquisition circuits, and a control circuit. One voltage conversion circuit includes at least one switch. The plurality of acquisition circuits are configured to detect an input voltage of a target voltage conversion circuit and a voltage of a bus (bus). The control circuit is configured to: regulate a current threshold of the target voltage conversion circuit based on the input voltage of the target voltage conversion circuit and the voltage of the bus (bus); and when an input current of the target voltage conversion circuit is greater than or equal to the current threshold of the target voltage conversion circuit, regulate turn-on or turn-off of the switch in the target voltage conversion circuit to reduce a current or input power of the target voltage conversion circuit. According to this application, when the input current of the target voltage conversion circuit is greater than or equal to the current threshold of the target voltage conversion circuit, the input power of the voltage conversion circuit can be reduced to ensure power supply safety and improve stability and power supply efficiency of the photovoltaic inverter. A structure is simple, the method is simple, and applicability is high.

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