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Pat. 10014761 United States, Int. Cl.22 H02M 7/217, H02M 1/08, H02M 1/42, H02M 1/00, H02M 7/487. Control method and device for I-type three-level circuit : Appl. N 15/364961 : Filed 30.11.2016 : Pub. 03.07.2018 : / Yunhe Mao, Zhixian Wu, Jian Li ; Assignee Vertiv Tech Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10014761/en?oq=US10014761.html (дата обращения: ДД.ММ.ГГГГ).