Patent · US Active

Method and apparatus for monitoring the operation of a gas discharge lamp

US7812612B2 · kind B2 · utility

3Cited by

4References

11Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Martin Feldtkeller · Munich, DE
Michael Herfurth · Gilching, DE
Dieter Zipprick · Hille, DE

Key dates

Filing date	Sep 28, 2007
Grant date	Oct 12, 2010
Priority date	—
Expiry date	Aug 18, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH05B41/2988
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

For monitoring the operation of a gas discharge lamp operated with an AC voltage, a lamp voltage signal is generated which is dependent on the voltage dropped across the gas discharge lamp during operation. The lamp voltage signal is filtered with an attenuation that is different for a DC component and for a component having the frequency of the AC voltage, whereupon a positive and negative peak value of the filtered lamp voltage signal are determined. For monitoring the gas discharge lamp, an average value of the two peak values is determined and compared with a limit value, and a difference value between the two peak values is determined and compared with a limit value.

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