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Pat. 10523130 United States, Int. Cl.22 H02M 7/483, H02M 1/12, H02M 7/48, H02M 1/00, H02M 7/5387, H02P 6/18. Alternate grounding of inverter midpoint for three level switching control : Appl. N 15/876984 : Filed 22.01.2018 : Pub. 31.12.2019 : / Randall Bax, Huazhen Chai, Frank Z. Feng, Ryan W. Schmid ; Assignee Hamilton Sundstrand Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10523130/en?oq=US10523130.html (дата обращения: ДД.ММ.ГГГГ).