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. 07, 2013
Filed:
Mar. 12, 2008
Makoto Sato, Kawagoe, JP;
Mizuki Utsuno, Kawagoe, JP;
Makoto Sato, Kawagoe, JP;
Mizuki Utsuno, Kawagoe, JP;
Sanken Electric Co., Ltd., , JP;
Abstract
A pseudo-resonant switching power source device is provided which comprises a primary windingof a transformerand a main MOS-FETconnected in series to a DC power source, a voltage-resonant capacitorconnected in parallel to main MOS-FET, a rectification smootherconnected to a secondary windingof transformerand having a rectification MOS-FETand a smoothing capacitor, a synchronized rectification controllerfor turning rectification MOS-FETon after turning-off of main MOS-FETand turning rectification MOS-FEToff before turning-on of main MOS-FET, a pulse width elongation circuitfor extending on-pulse width of rectification MOS-FET, and a main control circuitfor producing main drive signals to turn main MOS-FEToff and on with operation frequency responsive to on-pulse width of rectification MOS-FETextended by pulse width elongation circuitto vary operation frequency of main MOS-FETso as to restrain noise by high frequency components in main drive signals from main control circuit