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Pat. 9979277 United States, Int. Cl.22 H02M 1/12, H02M 1/38, H02M 7/483, H02M 7/5395. PWM control device and three-level power conversion device using PWM control device : Appl. N 15/450901 : Filed 06.03.2017 : Pub. 22.05.2018 : / Taku Takaku ; Assignee Fuji Electric Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9979277/en?oq=US9979277.html (дата обращения: ДД.ММ.ГГГГ).