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Pat. 9859816 United States, Int. Cl.22 H02M 7/537, H02M 7/5387, H02M 7/5395, H02M 1/00, H02M 7/487. Method for controlling modulation wave and three-phase three-wire three-level circuit : Appl. N 15/279446 : Filed 29.09.2016 : Pub. 02.01.2018 : / Feng Chen, Cheng Lu, Wei-Qiang Zhang, Hong-Yang Wu ; Assignee Delta Electronics Shanghai Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9859816/en?oq=US9859816.html (дата обращения: ДД.ММ.ГГГГ).