Patent · US Expired

Circuit for operating gas discharge lamps with a periodically alternating lamp current

US4888524A · kind A · utility

6Cited by

6References

23Claims

0Family size

Inventors

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

Key dates

Filing date	Feb 16, 1988
Grant date	Dec 19, 1989
Priority date	—
Expiry date	Feb 16, 2008

Classification

Technology area (CPC H)Electricity
CPC primaryH05B41/392
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit arrangement for operating at least one gas discharge lamp (5) with a periodically varying lamp current and adapted for connection to an alternating voltage source with a period N. The circuit is provided with a controlled semiconductor switch (3) and a control circuit for switching the controlled semiconductor switch with a switching period S in dependence upon a comparison between an actual signal proportional to the lamp current and a nominal signal derived from a voltage across the switching transistor (3).

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