Patent · US Expired

Operating circuit for a discharge lamp with early EOL detection

US6803731B2 · kind B2 · utility

2Cited by

3References

14Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Martin Grabner · Munich, DE
Markus Heckmann · Munich, DE

Key dates

Filing date	Mar 5, 2003
Grant date	Oct 12, 2004
Priority date	—
Expiry date	Mar 5, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH05B41/2985
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention relates to a novel operating circuit for a low-pressure discharge lamp 1 with early EOL detection via a measurement of the DC voltage between the electrodes 2, 3. In this case, the DC voltage can be modified by an offset voltage 10 such that only one polarity has to be taken into account during measurement.

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