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:
Dec. 20, 2016
Filed:
Nov. 29, 2011
Applicant:
Kenji Nemoto, Kawasaki, JP;
Inventor:
Kenji Nemoto, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02M 3/335 (2006.01); H02M 3/338 (2006.01); H02M 1/00 (2006.01);
U.S. Cl.
CPC ...
H02M 3/3385 (2013.01); H02M 2001/0032 (2013.01); Y02B 70/16 (2013.01);
Abstract
A switching power supply apparatus includes a voltage holding unit which holds voltage generated in an auxiliary winding of a transformer, and a voltage detecting unit which detects voltage applied to the first switching unit. When the first switching unit operates such that voltage generated in a secondary winding of the transformer may be low, voltage is supplied from the voltage holding unit to the first switching unit in accordance with the voltage detected by the voltage detecting unit to thus turn on the first switching unit.