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Pat. 9923446 United States, Int. Cl.22 H02M 3/335, H02M 1/08, H02M 1/00. Method of controlling the switching of a multilevel converter, a controller for a multilevel converter, and a computer program for controlling a converter : Appl. N 15/503129 : Filed 11.08.2014 : Pub. 20.03.2018 : / Christopher Townsend, Hector Zelaya De La Parra ; Assignee Abb Schweiz Ag ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9923446/en?oq=US9923446.html (дата обращения: ДД.ММ.ГГГГ).