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Pat. 9973108 United States, Int. Cl.22 H02M 1/08, H02M 7/217, H02M 7/219, H02M 7/483, H02M 7/487, H02M 7/5387. Hybrid modulation strategy for multilevel inverters : Appl. N 15/662044 : Filed 27.07.2017 : Pub. 15.05.2018 : / Hongliang Wang, Yan-Fei Liu ; Assignee Hongliang Wang, Yan-Fei Liu ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9973108/en?oq=US9973108.html (дата обращения: ДД.ММ.ГГГГ).