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Pat. 9933468 United States, Int. Cl.22 H02M 7/44, G01R 21/00, G01R 25/00, G01R 27/26, H02J 3/40. Detecting device and detecting method for detecting output impedance angle of inverter : Appl. N 15/166288 : Filed 27.05.2016 : Pub. 03.04.2018 : / Jian-Hong Zhou, Cheng Lu, Jia-Min Zhang, Hong-Yang Wu ; Assignee Delta Electronics Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9933468/en?oq=US9933468.html (дата обращения: ДД.ММ.ГГГГ).