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:
Jan. 20, 2004
Filed:
Oct. 06, 2000
Applicant:
Inventor:
David Alan Cammack, Scarborough, NY (US);
Assignee:
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 3/702 ;
U.S. Cl.
CPC ...
H05B 3/702 ;
Abstract
A system for driving a gas discharge lamp includes a bridge circuit providing a pulse voltage signal, a controller which generates a pulse width modulated signal corresponding to a desired waveform. A filter circuit receives and filters the pulse voltage signal to provide this to the lamp. The pulse width modulated signal corresponds to the desired waveform, and includes a sweeping frequency signal and a fixed frequency amplitude modulated signal.