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Pat. 10263535 United States, Int. Cl.22 H02M 7/487, H02M 7/5395. Method and device for voltage balancing of DC bus capacitors of neutral-point clamped four-level inverter : Appl. N 15/980794 : Filed 16.05.2018 : Pub. 16.04.2019 : / Kui Wang, Zedong Zheng, Yongdong Li ; Assignee Tsinghua University ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10263535/en?oq=US10263535.html (дата обращения: ДД.ММ.ГГГГ).