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Pat. 11527966 United States, Int. Cl.22 H02J 3/42, G01R 19/165, G01R 19/25, G01R 23/15, H02H 3/353, H02H 7/122, H02M 7/537, H02M 1/00. Power conversion apparatus that judges system power failure based on system frequency and voltage : Appl. N 17/073605 : Filed 19.10.2020 : Pub. 13.12.2022 : / Yuusuke Kouno, Yoichi Morishima ; Assignee Toshiba Infrastructure Systems & Solutions Corporal, Toshiba Corp ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11527966/en?oq=US11527966.html (дата обращения: ДД.ММ.ГГГГ).