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Pat. 9912252 United States, Int. Cl.22 H02M 7/537, H02J 3/38, H02M 1/36, H02M 7/12, H02M 7/219, H02M 7/5387, H02M 7/797. Pre-charge circuit and photovoltaic inverter : Appl. N 15/164069 : Filed 25.05.2016 : Pub. 06.03.2018 : / Yanfei Yu, Hua Ni, Zongjun Yang, Shangfang Dai, Pengcheng Huang ; Assignee Sungrow Power Supply Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9912252/en?oq=US9912252.html (дата обращения: ДД.ММ.ГГГГ).