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Pat. 11474133 United States, Int. Cl.22 G01R 27/02, G01R 27/18, H02J 3/38, H02M 7/5387, H02S 40/32, H02S 50/10. Insulation impedance detection circuit and insulation impedance detection method of photovoltaic inverter system : Appl. N 17/026328 : Filed 21.09.2020 : Pub. 18.10.2022 : / Yuxi Wang, Xuancai Zhu, Weiyi Zheng, Bingwen Weng ; Assignee Delta Electronics Shanghai Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11474133/en?oq=US11474133.html (дата обращения: ДД.ММ.ГГГГ).