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Pat. 11303215 United States, Int. Cl.22 H02M 3/335, H02J 7/00. System and method for providing a constant power source : Appl. N 17/137165 : Filed 29.12.2020 : Pub. 12.04.2022 : / Liansong Wang, Zhimin Dan, Yizhen Hou, Fangjie Zhou, Changjian Liu ; Assignee Contemporary Amperex Technology Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11303215/en?oq=US11303215.html (дата обращения: ДД.ММ.ГГГГ).