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:
Sep. 02, 2014
Filed:
Oct. 10, 2011
Applicants:
Takeki Sugahara, Niiza, JP;
Masao Ueno, Niiza, JP;
Inventors:
Takeki Sugahara, Niiza, JP;
Masao Ueno, Niiza, JP;
Assignee:
Sanken Electric Co., Ltd., Niiza-shi, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F 5/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A switching power supply is provided to supply an AC input voltage. The supply includes a control circuit configured to detect a voltage of the AC power source in a voltage waveform, and switch elements in a synchronous rectification switching mode in synchronization with polarities of the voltage waveform when the AC input voltage is equal to or greater than a predetermined voltage value. The control unit also operates the switching without synchronization with the polarities when the AC input voltage is smaller than the predetermined voltage value.