Patent · US Expired

Circuit arrangement for operating a high-pressure gas discharge lamp

US4471269A · kind A · utility

34Cited by

1References

9Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Hans G. Ganser · Stolberg, DE
Ralf Sch/a/ fer · Aachen, DE
Hans Peter Stormberg · Stolberg, DE

Key dates

Filing date	Dec 8, 1982
Grant date	Sep 11, 1984
Priority date	—
Expiry date	Dec 8, 2002

Classification

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

Abstract

A circuit arrangement for operating a high-pressure gas discharge lamp (14) with high frequency current in which a direct voltage is supplied to a transistor bridge (5 to 8) having a transverse branch in which is arranged a choke coil (13). The clock (switching) frequency of the transistor bridge is varied within each period of the AC mains alternating voltage in dependence upon the current derived from the AC mains voltage.

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