Patent · US Expired

Circuit arrangement for operating a high pressure sodium lamp

US5262701A · kind A · utility

11Cited by

3References

4Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Gunther Hans Derra · Aachen, DE
Hans G. Ganser · Stolberg, DE
Hans Peter Stormberg · Stolberg, DE

Key dates

Filing date	Feb 11, 1992
Grant date	Nov 16, 1993
Priority date	—
Expiry date	Feb 11, 2012

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B20/00
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention relates to a dimming circuit arrangement for operating a high-pressure sodium lamp L with controllable color temperature. The lamp is supplied with current pulses having a controllable duty cycle D. A change in the color temperature can be achieved through a change .DELTA.D in the duty cycle D and a simultaneous change .DELTA.P in the power supplied to the lamp, while the relation .DELTA.D/.DELTA.P>0 is satisfied.

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