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Pat. 10355618 United States, Int. Cl.22 H02M 7/487, H02M 1/00, H02M 1/08, H02M 1/38. Active neutral point clamped inverter, zero-crossing switching method and zero-crossing switching apparatus thereof : Appl. N 15/950666 : Filed 11.04.2018 : Pub. 16.07.2019 : / Jiacai Zhuang, Yuqing Cui, Deyong Zhao, Xiaohui Luo, Chaoxuan Zhang, Jun Xu, Yilei Gu, Xinyu Wang ; Assignee Sungrow Power Supply Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10355618/en?oq=US10355618.html (дата обращения: ДД.ММ.ГГГГ).