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Pat. 10411607 United States, Int. Cl.22 H02M 3/335, H02M 3/337, G03G 15/00, H02M 1/00, H02M 1/32, H02M 1/36. Power supply device having switching element with driving frequency control based on input voltage and image forming apparatus having power supply device : Appl. N 15/716288 : Filed 26.09.2017 : Pub. 10.09.2019 : / Jun Kawakatsu ; Assignee Canon Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10411607/en?oq=US10411607.html (дата обращения: ДД.ММ.ГГГГ).