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. 07, 2015
Filed:
Jul. 12, 2013
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Hiroshi Maruyama, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., , JP;
Abstract
Aspects of the provide a control circuit of a quasi-resonant switching power supply in which the switching frequency can be adequately reduced under a light load condition. Some aspects include a control circuit of a quasi-resonant switching power supply that performs switching operation of a switching element based on a bottom detection signal. The control circuit of the switching power supply can include a dummy signal generating circuit that generates a dummy signal for replacing the bottom detection signal when the bottom detection becomes unable due to damping of a resonant waveform with decrease of switching frequency, or when the number of bottoms in the resonant waveform exceeds a predetermined times. The use of the dummy signal can increase the number of skips and thus, reduces the switching frequency.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile