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Pat. 10547235 United States, Int. Cl.22 H02M 3/335, G03G 15/00, H02M 1/08, H02M 1/36, H02M 1/00, H02M 1/34. Power supply apparatus and image forming apparatus changing a frequency of a switching operation : Appl. N 16/057636 : Filed 07.08.2018 : Pub. 28.01.2020 : / Yasuhiro Shimura ; Assignee Canon Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10547235/en?oq=US10547235.html (дата обращения: ДД.ММ.ГГГГ).