Patent · US Expired

Method of operating a high-pressure metal vapor discharge lamp and circuit arrangement for carrying out this method

US4705991A · kind A · utility

7Cited by

8References

18Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Hans G. Ganser · Stolberg, DE
Reinhard Kersten · Aachen, DE
Rolf Schafer
Hans Peter Stormberg · Stolberg, DE

Key dates

Filing date	May 27, 1982
Grant date	Nov 10, 1987
Priority date	—
Expiry date	May 27, 2002

Classification

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

Abstract

A method of operating a high-pressure metal vapor discharge lamp at a periodic operating voltage of more than 500 Hz wherein the operating voltage is suddenly varied in phase at intervals, and preferably also wobbled in frequency, in order to avoid acoustic resonances in the lamp.

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