The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 2016
Filed:
Aug. 21, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Shinichiro Matsumoto, Yokohama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
The power supply device includes a transformer that includes primary, secondary and auxiliary windings; a switching unit that switches current flowing to the primary winding of the transformer; a current detection unit that detects current flowing through the primary winding, and outputs a voltage according to the current; a control unit that controls switching operation of the switching unit, according to the voltage output from the current detection unit; a first voltage detection unit that detects a voltage induced in the auxiliary winding; and a correction unit that corrects the voltage output by the current detection unit to the control unit when the voltage induced in the auxiliary winding and detected by the first voltage detection unit is higher than a first predetermined value. This configuration can reduce start-up power consumption while suppressing the vibration noise of the transformer.