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Pat. 10312812 United States, Int. Cl.22 H02M 1/00, B41J 29/393, H02M 3/158, H02M 3/156. Wide-range positive-negative adjustable high-voltage DC power supply and the control method thereof : Appl. N 15/674551 : Filed 11.08.2017 : Pub. 04.06.2019 : / Jianming Li, Zheng Liu, Jianping Sun, Chengshun Zhang ; Assignee Huizhou Sanhua Industrial Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10312812/en?oq=US10312812.html (дата обращения: ДД.ММ.ГГГГ).