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Pat. 11211878 United States, Int. Cl.22 H02M 7/483, F03D 7/04, H02J 3/38, H02M 1/32, H02M 5/458. DC chopper for MMC cell with integrated chopper resistor : Appl. N 16/992051 : Filed 12.08.2020 : Pub. 28.12.2021 : / Ciprian Biris, Cem Ozgur Gercek, Lars Helle, Duy Duc Doan, Tune Pedersen ; Assignee Vestas Wind Systems As ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11211878/en?oq=US11211878.html (дата обращения: ДД.ММ.ГГГГ).