Patent · US Expired

Circuit arrangement for A.C. operation of gas discharge lamps

US4748381A · kind A · utility

4Cited by

9References

17Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Hans G. Ganser · Stolberg, DE
Ralf Schafer · Marbach, DE
Hans Peter Stormberg · Stolberg, DE

Key dates

Filing date	Nov 7, 1986
Grant date	May 31, 1988
Priority date	—
Expiry date	Nov 7, 2006

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 A.C. operation of gas discharge lamps comprises a full-wave rectifier (1) connected to an alternating voltage source. The direct voltage is supplied to a combinatorial circuit part (3 to 8) in the form of a direct voltage converter, to which is connected a bridge circuit (9) which comprises four thyristors. The transverse branch of the bridge circuit includes the lamp (5). The full-wave rectifier (1) is followed by a smoothing capacitor (2) and an electronic switching element (14) is connected parallel to the bridge circuit (9). The switching element is switched to the conducting state in the vicinity of the zero passages of the input alternating voltage. As a result shortcircuits in the bridge circuit are avoided.

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