Patent · US Expired

High pressure lamp operating circuit with suppression of lamp flicker

US5608294A · kind A · utility

54Cited by

9References

23Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Gunther Hans Derra · Aachen, DE
Hanns E. Fischer · Stolberg, DE
Hans G. Ganser · Stolberg, DE
Holger Monch · Vaals, NL

Key dates

Filing date	Jun 7, 1995
Grant date	Mar 4, 1997
Priority date	—
Expiry date	Jun 7, 2015

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S315/07
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit arrangement for operating a high pressure discharge lamp includes input terminals for connection to a supply voltage source and an apparatus coupled to the input terminals for supplying an alternating lamp current to the high pressure discharge lamp. A device (III) is provided for generating a current pulse in each half period of the lamp current. This current pulse has the same polarity as the lamp current and is superimposed on the lamp current in the latter part of a predetermined fraction of the half periods of the lamp current. The circuit substantially suppresses flickering of the discharge arc during lamp operation.

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