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. 22, 2015
Filed:
Apr. 12, 2013
Fuji Electric Co., Ltd., Kawasaki, JP;
Kenichi Nishijima, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
A switching power supply device that can reduce power supply noise includes a switching power supply device main body that switches a semiconductor switching element at a power supply frequency fs, and supplies power to an electronic instrument such as an AM radio receiver. The switching power supply device detects an AM radio reception frequency fc and a power supply harmonic component that interferes with the AM radio reception frequency fc. Further, the switching power supply device determines, in a sideband of the AM radio reception frequency fc on a side that does not include the power supply harmonic component, a jitter width Δf for the power supply frequency fs, avoiding a bandwidth BW of the AM radio reception frequency fc, controlling the jitter of the power supply frequency fs in the jitter width Δf, and switching the semiconductor switching element at a frequency of [fs±Δf/2].
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile