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Pat. 10923999 United States, Int. Cl.22 H02M 1/12, H02J 3/01, H02J 3/18, H02M 7/483, H02M 7/5387. Active power filter-based modular multilevel converter : Appl. N 16/830233 : Filed 25.03.2020 : Pub. 16.02.2021 : / Guanlong Jia, Min Chen, Song Tang ; Assignee Zhejiang University Zju ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10923999/en?oq=US10923999.html (дата обращения: ДД.ММ.ГГГГ).