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Pat. 9906057 United States, Int. Cl.22 H02J 1/00, H02J 3/32, H02J 7/00, H02J 7/34, H02M 1/00, H02M 7/483. Modular multilvel converter and control framework for hybrid energy storage : Appl. N 14/878817 : Filed 08.10.2015 : Pub. 27.02.2018 : / Feng Guo, Yanzhu Ye, Ratnesh Sharma ; Assignee Nec Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9906057/en?oq=US9906057.html (дата обращения: ДД.ММ.ГГГГ).