Method and apparatus for monitoring the operation of a gas...

Details Method and apparatus for monitoring the operation of a gas... Method and apparatus for monitoring the operation of a gas...

2007-09-28

2010-10-12

Nguyen, Hoai-An D (Department: 2831)

Electricity: measuring and testing

Electric lamp or discharge device

Electric lamp

C315S291000

Reexamination Certificate

active

07812612

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.

REFERENCES:
patent: 5859505 (1999-01-01), Bergman et al.
patent: 6140771 (2000-10-01), Luger et al.
patent: 6400095 (2002-06-01), Primisser et al.
patent: 7355352 (2008-04-01), Deppe et al.
patent: 2008/0203939 (2008-08-01), Pekarski et al.

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