Patent · US Expired

Device for operating discharge lamps

US6806657B2 · kind B2 · utility

3Cited by

2References

7Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Bernd Rudolph · Forstern, DE
Harald Schmitt · Hersbruck, DE

Key dates

Filing date	Oct 30, 2003
Grant date	Oct 19, 2004
Priority date	—
Expiry date	Oct 30, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH05B41/295
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A device for operating a plurality of discharge lamps (71, 72) is to be fashioned cost effectively. Two lamps (71, 72) are therefore operated in a single load circuit. In the preheating phase, the incandescent filaments (711, 712, 721, 722) are supplied with preheating current either directly or via a transformer (Ls, Lp). The preheating current is controlled via a temperature-dependent resistor (PTC) in such a way that the continuous heating current is greatly reduced over all the filaments during the operation of the lamp.

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