Lamp operating circuit and operating method for a lamp...

Details Lamp operating circuit and operating method for a lamp... Lamp operating circuit and operating method for a lamp...

2007-07-17

2007-07-17

Phan, Tho (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S291000, C315S224000, C315S219000, C315S308000, C315S293000

Reexamination Certificate

active

11253606

ABSTRACT:
The invention relates to a circuit and to a method for operating a lamp. In this case, a reactance for the purpose of detecting the lamp voltage, a zero point detection device for the purpose of determining the zero crossing of the current through the reactance and a current measuring device and, finally, a track-and-hold circuit triggered by the zero point detection device are used to measure the lamp current in such a way that the influence of parasitic capacitances is still ruled out.

REFERENCES:
patent: 5631523 (1997-05-01), Rothenbuhler et al.
patent: 6008593 (1999-12-01), Ribarich
patent: 6498437 (2002-12-01), Chang et al.
patent: 2005/0035729 (2005-02-01), Lev et al.
patent: 196 13 257 (1997-07-01), None
patent: WO 00/33621 (2000-06-01), None
Search Report from European Patent Office (for related foreign patent application) referencing the above-listed patent documents, dated Mar. 9, 2006 (6 pages total).

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