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Pat. 10389271 United States, Int. Cl.22 H02M 7/483, H02M 7/487. Single-phase four-level inverter circuit topology and three-phase four-level inverter circuit topology : Appl. N 15/768552 : Filed 07.11.2016 : Pub. 20.08.2019 : / Hongliang Wang, Yan-Fei Liu ; Assignee Hongliang Wang, Yan-Fei Liu ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10389271/en?oq=US10389271.html (дата обращения: ДД.ММ.ГГГГ).