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:
Feb. 21, 2012
Filed:
Dec. 01, 2008
Applicants:
Xun Liu, Hong Kong, CN;
Chi Kwan Lee, Hong Kong, CN;
Ron Shu Yuen Hui, Hong Kong, CN;
Inventors:
Assignee:
City University of Hong Kong, Kowloon, HK;
Primary Examiner:
Int. Cl.
CPC ...
H03H 7/01 (2006.01);
U.S. Cl.
CPC ...
Abstract
An EMI filter for use between a power source and an electronic product is formed of at least one planar element including a pair of opposed coreless spiral planar windings, and a planar capacitor. This enables the integration of common mode and differential mode filters into integrated planar structures. Furthermore the planar EMI filter may be combined with an active filter element to provide a hybrid EMI filter comprising both passive and active elements with superior performance.