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. 16, 2004
Filed:
Dec. 13, 2002
Applicant:
Inventor:
Arthur T. Nemirow, Carson City, NV (US);
Assignee:
Bruce Industries, Inc., Dayton, NV (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 3/702 ;
U.S. Cl.
CPC ...
H05B 3/702 ;
Abstract
Problems in fluorescent lamp operation are determined by detecting an increase in voltage on a flyback transformer secondary due to the open circuit flyback effect. A ballast implementing the present invention supplies alternating power to ignite and maintain each lamp. DC power is provided to each filament from a multiple output flyback converter. A voltage level is sensed across at least one filament of each lamp. A determination is made that at least one sensed voltage level exceeds a threshold based on the flyback open circuit voltage.