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Pat. 10355585 United States, Int. Cl.22 H02M 1/32, H02H 7/125, H02M 1/36, H02M 1/44, H02M 5/458, H02M 7/06, H02M 7/12, H02M 7/162. Variable frequency drive circuit with overvoltage protection : Appl. N 14/656049 : Filed 12.03.2015 : Pub. 16.07.2019 : / Huaqiang Li, Youdong He, Xiaoling Li ; Assignee Eaton Intelligent Power Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10355585/en?oq=US10355585.html (дата обращения: ДД.ММ.ГГГГ).