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Pat. 11128215 United States, Int. Cl.22 H02M 3/158, H02M 1/00, H02M 3/07, H02M 3/156. Direct current voltage step-down regulation circuit structure : Appl. N 16/097213 : Filed 28.12.2017 : Pub. 21.09.2021 : / Weihua Cao ; Assignee Zhengzhou Yunhai Information Technology Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11128215/en?oq=US11128215.html (дата обращения: ДД.ММ.ГГГГ).