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Pat. 11031878 United States, Int. Cl.22 H02M 3/335, H02M 3/337, H02M 7/48, H02M 1/00. Resonant converter and manufacturing method of transformer thereof : Appl. N 16/813374 : Filed 09.03.2020 : Pub. 08.06.2021 : / Da Jin, Yahong Xiong, Qinghua Su ; Assignee Delta Electronics Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11031878/en?oq=US11031878.html (дата обращения: ДД.ММ.ГГГГ).