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Pat. 9970988 United States, Int. Cl.22 G01R 31/327, H02H 7/26, H02J 3/38, H02J 7/35, H02M 7/44, H03H 7/01. Relay abnormality detection device and power conditioner : Appl. N 15/386397 : Filed 20.11.2015 : Pub. 15.05.2018 : / Chienru Lung, Hideki Hidaka ; Assignee Tabuchi Electric Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9970988/en?oq=US9970988.html (дата обращения: ДД.ММ.ГГГГ).