Circuit arrangement for operation of discharge lamps, and...

Details Circuit arrangement for operation of discharge lamps, and... Circuit arrangement for operation of discharge lamps, and...

2011-08-09

2011-08-09

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C315S2090SC, C315S247000, C315S307000

Reexamination Certificate

active

07994734

ABSTRACT:
A circuit arrangement for operating a discharge lamp, wherein the circuit arrangement comprises a commutation device, which has an input which is coupled to a DC source, and has an output which can be coupled to a discharge lamp. The commutation device is designed in such a way that it couples the DC source to the output, and the polarity at which the DC source is coupled to the output can be commutated by a control device. The control device has a sync input, and the polarity of the DC source is commutated in synchronism with sync pulses of a sync signal which can be applied at the sync input. The control device has a measuring input, which is coupled to a measuring device which is designed to provide a measured value which is a measure of the size of electrode peaks. The control device suppresses at least one commutation if the measured value overshoots or undershoots a predetermined threshold value.

REFERENCES:
patent: 5917558 (1999-06-01), Stanton
patent: 7777423 (2010-08-01), Fischer et al.
patent: 2003/0098659 (2003-05-01), Okamoto et al.
patent: 2003/0160577 (2003-08-01), Noguchi
patent: 1 152 645 (2001-11-01), None
patent: 1 624 733 (2006-02-01), None
patent: WO 2004/002200 (2003-12-01), None
patent: WO 2006/016335 (2006-02-01), None

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