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:
Jul. 28, 2015
Filed:
Mar. 20, 2012
Applicant:
Shinichiro Matsumoto, Kawasaki, JP;
Inventor:
Shinichiro Matsumoto, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 1/36 (2007.01); H02M 3/335 (2006.01); H02M 7/217 (2006.01);
U.S. Cl.
CPC ...
H02M 1/36 (2013.01); H02M 3/33523 (2013.01); H02M 7/217 (2013.01);
Abstract
A switching power supply includes a rectifying unit configured to rectify an input alternating voltage, a storage unit configured to smooth the voltage rectified by the rectifying unit and store as a DC voltage, a pulse signal generation unit configured to generate a pulse signal from the DC voltage stored in the storage unit, and a detection unit configured to detect that a commercial alternating current power supply has been turned off based on the pulse signal generated by the pulse signal generation unit.