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Pat. 10044291 United States, Int. Cl.22 H02M 1/00, H02M 7/42, H02J 3/38, H02M 7/487, H02M 7/5395, H02M 1/12, H02M 3/00. Method and device for modulating a five-level inverter, and photovoltaic system : Appl. N 14/938192 : Filed 11.11.2015 : Pub. 07.08.2018 : / Jie Ding, Haiyan Zou, Lei Tao, Taotao Xu, Cheng Zhang ; Assignee Sungrow Power Supply Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10044291/en?oq=US10044291.html (дата обращения: ДД.ММ.ГГГГ).