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:
Jun. 08, 1999
Filed:
Nov. 24, 1997
Applicant:
Inventors:
Rebekka Porath, Aachen, DE;
Achim Hilgers, Aachen, DE;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
315291 ; 3152 / ; 315D / ; 315D / ; 310311 ;
Abstract
A circuit arrangement for operating a discharge lamp comprising an oscillator for generating a high frequency input voltage and a piezo-electric transformer with input terminals coupled to the oscillator and output terminals. A load circuit is coupled to the output terminals of the piezo-electric transformer and includes terminals for lamp connection. The load circuit comprises an adjustable capacitor which forms a very simple device for controlling the light output of the discharge lamp over a wide range.