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Pat. 11296593 United States, Int. Cl.22 H02M 1/12, H02M 1/44, H02M 7/487, H02M 7/5387. Neutral-point voltage balance control method and system for three-level converter in full power factor range : Appl. N 17/260461 : Filed 18.06.2019 : Pub. 05.04.2022 : / Chenghui Zhang, Changwei Qin, Xiaoyan Li, Xiangyang Xing, Shunquan Hu, Ying Jiang, Alian Chen ; Assignee Shandong University ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11296593/en?oq=US11296593.html (дата обращения: ДД.ММ.ГГГГ).