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Pat. 9979275 United States, Int. Cl.22 H02M 1/32, H02M 1/00, H02M 1/08, H02M 3/335. Undervoltage protection circuit, undervoltage protection method and switching power supply : Appl. N 15/172321 : Filed 03.06.2016 : Pub. 22.05.2018 : / Xiaoru Xu, Yunlong Han ; Assignee Hangzhou Silergy Semiconductor Technology Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9979275/en?oq=US9979275.html (дата обращения: ДД.ММ.ГГГГ).