Patent · US Expired

EOL detection with integrated filament interrogation

US6646390B2 · kind B2 · utility

4Cited by

1References

11Claims

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	Nov 11, 2003
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, an electrode interrogation can be carried out by checking a respective connection via the electrodes 2, 3 to a respective reference potential.

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