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:
Oct. 15, 2002
Filed:
May. 29, 2001
Applicant:
Inventors:
Meng-Guang Wang, Surrey, CA;
Adolph John Vandermaar, Maple Ridge, CA;
Assignee:
Powertech Labs Inc., Surrey, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 3/106 ;
U.S. Cl.
CPC ...
G01R 3/106 ;
Abstract
Transformer winding movement is detected by providing an input sensor inside the transformer on an input winding lead and providing an output sensor inside the transformer on an output winding lead. This eliminates the frequency limitation imposed by the lead lengths required for prior art external measurement, making it possible to obtain useful measurements at much higher frequencies (20 MHz) than with the prior art techniques.