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:
Jun. 02, 1992
Filed:
Sep. 04, 1990
Applicant:
Inventors:
Kevin R Covi, Glenford, NY (US);
William J Petrowsky, Kingston, NY (US);
James H Spreen, Stone Ridge, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01F / ; G05F / ;
U.S. Cl.
CPC ...
336175 ; 323250 ; 363 39 ;
Abstract
A dual mold choke is provided to reduce both differential and common mode electromagnetic interference. Ferrite cores are placed around DC power bus bars providing an inductor limiting differential mode noise and creating a choke reducing common mode noise. The use of E-cores provides a simplified mechanical assembly while providing high levels of noise reduction. An air gap between the center legs of the cores prevents saturation of the choke.