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Pat. 11340310 United States, Int. Cl.22 H02M 1/14, G01R 31/42, H02M 1/088, H02M 5/458. Voltage imbalance assessment method and power conversion device : Appl. N 16/956830 : Filed 12.01.2018 : Pub. 24.05.2022 : / Kazushige Hotta, Keisuke Tanabe, Yusuke Arao ; Assignee Hitachi Industrial Equipment Systems Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11340310/en?oq=US11340310.html (дата обращения: ДД.ММ.ГГГГ).