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:
Mar. 22, 1988
Filed:
Feb. 28, 1986
Applicant:
Inventors:
Kuang-Ta Ho, Charlotte, NC (US);
Oliver A Bell, Jr, Statesville, NC (US);
Assignee:
Colt Industries Inc., New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23H / ; H02H / ;
U.S. Cl.
CPC ...
219 / ; 361 91 ;
Abstract
An EDM circuit that detects power transistor switch failure. A comparator 62 and a sample and hold stage 60 are used during a window of time formed by the off-time of a pulse generator to determine whether power switch MOSFET 30 is conducting. If MOSFET 30 is conducting during the off-time of the pulse generator LED 72 will emit light to indicate a failed power transistor switch.