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Pat. 11139733 United States, Int. Cl.22 H02M 1/32, H02M 7/483. Modular multilevel converter sub-module having DC fault current blocking function and method of controlling the same : Appl. N 16/844447 : Filed 09.04.2020 : Pub. 05.10.2021 : / Kyeon Hur, Heejin Kim, Sangmin Kim, Jongseo Na, Ryangkyu Kim ; Assignee Industry Academic Cooperation Foundation of Yonsei University ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11139733/en?oq=US11139733.html (дата обращения: ДД.ММ.ГГГГ).