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:
Nov. 30, 1999
Filed:
May. 27, 1998
Applicant:
Inventors:
Seiichi Takahashi, Sagamihara, JP;
Yasuo Ohashi, Tokyo-to, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 21 ;
Abstract
In a switching power-supply unit in which a series circuit comprising a primary winding of a switching transformer and a switching device is provided across the terminals of an input power supply, a noise-eliminating bypass capacitor is connected across the ends of the series circuit. The bypass capacitor forms a short circuit path for high frequency noise having a frequency higher than the switching frequency of the switching device, thereby reducing high-frequency radiant noise.