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Pat. 9906022 United States, Int. Cl.22 H02J 1/00, G01R 27/18, G01R 31/14, H02J 3/00, H02M 3/158, H02M 7/49, G01R 31/50, H02M 1/32. Cascaded multilevel converter self-test system and self-test method for the same : Appl. N 15/198544 : Filed 30.06.2016 : Pub. 27.02.2018 : / Baoqi Liu, Yongli Xiao, Liying Xue, Zhihuai Zeng ; Assignee Sungrow Power Supply Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9906022/en?oq=US9906022.html (дата обращения: ДД.ММ.ГГГГ).