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Pat. 9960666 United States, Int. Cl.22 H02M 1/10, H02M 1/32, H02M 3/335, H02M 5/458, H02M 7/5387, H02M 1/00. Four-port power electronic transformer based on hybrid modular multilevel converter : Appl. N 15/520420 : Filed 16.03.2016 : Pub. 01.05.2018 : / Jianfeng Zhao, Dongye Li, Zhendong Ji, Yichao Sun ; Assignee Southeast University ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9960666/en?oq=US9960666.html (дата обращения: ДД.ММ.ГГГГ).