Discharge lamp lighting circuit with an open protection circuit

Details Discharge lamp lighting circuit with an open protection circuit Discharge lamp lighting circuit with an open protection circuit

2006-06-27

2008-09-30

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S324000, C315S360000, C315S291000, C315S128000, C315S312000

Reexamination Certificate

active

07429829

ABSTRACT:
A discharge lamp lighting circuit includes a plurality of discharge lamps, a driving circuit, a control circuit, an open protection circuit, which are connected in series. The open protection circuit includes an open control circuit, a delay circuit, and a plurality of open detecting circuits connected in series. Each of the open detecting circuits is connected to a corresponding one of the discharge lamps. One terminal of the open control circuit is connected to the control circuit, and the other terminal of the open control circuit is connected to one terminal of the delay circuit and a predetermined one of the open detecting circuits. The other terminal of the delay circuit is connected to another predetermined one of the open detecting circuits and ground.

REFERENCES:
patent: 4998046 (1991-03-01), Lester
patent: 5068570 (1991-11-01), Oda et al.
patent: 6555972 (2003-04-01), Lestician
patent: 6710555 (2004-03-01), Suzuki et al.
patent: 7208884 (2007-04-01), Bao et al.

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