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Pat. 10622915 United States, Int. Cl.22 H02M 7/487, H02M 1/08, H02M 1/12, H02M 7/483. Four-quadrant modulation technique to extend modulation index range for multilevel selective harmonic elimination / compensation : Appl. N 16/323869 : Filed 09.08.2017 : Pub. 14.04.2020 : / Shuo Wang, Hui Zhao ; Assignee University of Florida Research Foundation Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10622915/en?oq=US10622915.html (дата обращения: ДД.ММ.ГГГГ).