Patent · US Expired

Circuit arrangement for operating a high-pressure discharge lamp

US6232725A · kind A · utility

18Cited by

2References

7Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Gunther Hans Derra · Aachen, DE
Hanns E. Fischer · Stolberg, DE
Hans G. Ganser · Stolberg, DE
Thomas Krücken · Aachen, DE
Holger Moench · Vaals, NL
Rob Snijkers · Landgraaf, NL

Key dates

Filing date	Dec 15, 1999
Grant date	May 15, 2001
Priority date	—
Expiry date	Dec 15, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S315/05
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit arrangement is provided for operating a high pressure discharge lamp with a lamp current which, in successive periods, has opposite polarities. The lamp is provided with at least two main electrodes being spaced an electrode distance from each other. The circuit arrangement includes input terminals for connection to a supply source, output terminals for connection to the high pressure discharge lamp, and an element, coupled to the input terminals, for supplying the lamp current to the high pressure discharge lamp, which current, in successive periods, has a predetermined shape. The circuit arrangement is provided with an element for detecting a first parameter indicative of the electrode distance and forming a first signal dependent on the first parameter and with an element for reshaping the lamp current, in successive periods, in dependence of the thus formed first signal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.