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:
Sep. 15, 2009
Filed:
Dec. 09, 2004
William L. Keith, Lake in the Hills, IL (US);
George L Grouev, Arlington Heights, IL (US);
Kent E. Crouse, Carpentersville, IL (US);
William L. Keith, Lake in the Hills, IL (US);
George L Grouev, Arlington Heights, IL (US);
Kent E. Crouse, Carpentersville, IL (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The electronic ballast with lamp type determination for an electronic ballast providing power to a lamp filamentincludes a filament current sensing circuitoperably connected to the lamp filamentand generating a sensed filament current signal, and a microprocessor Ureceiving the sensed filament current signal and operably connected to control the power to the lamp filament. The microprocessor Uis programmed to heat the lamp filament by applying the power at a first frequency, measure the filament characteristics, and determine lamp type from the measured filament characteristics. The microprocessor Ucan also be programmed to update operating parameters for the electronic ballast to suit the determined lamp type.