Patent · US Expired

Method and system for starting and operating a discharge lamp

US5742132A · kind A · utility

14Cited by

9References

14Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Andreas Huber · Holzgerlingen, DE
Dieter Lang · Kronach, DE

Key dates

Filing date	Mar 25, 1996
Grant date	Apr 21, 1998
Priority date	—
Expiry date	Mar 25, 2016

Classification

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

Abstract

To effectively suppress glow discharge of a discharge lamp, especially a h-pressure discharge lamp, immediately after starting or firing, the lamp is supplied in a second, or run-on phase with a run-up current which has a form factor F greater than one (1), for example 1.13 to 1.45, and which has an effective value I.sub.eff which is higher than the rated normal operating current of the lamp. A control circuit (C), coupled to a controllable power supply, and to a switchable bridge circuit, controls the frequency of the run-on phase current to be higher than the normal operating frequency, for example about 2 kHz with a normal operating frequency between about 90-150 Hz.

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