High-intensity discharge lamp ballast and method for...

Details High-intensity discharge lamp ballast and method for... High-intensity discharge lamp ballast and method for...

2006-09-19

2006-09-19

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Automatic substitution of the load device or electrode

C315S092000, C315S291000, C315S307000, C362S013000, C362S020000

Reexamination Certificate

active

07109659

ABSTRACT:
A high-intensity discharge lamp ballast includes a lamp operation unit configured to supply power from a power source to a high-intensity discharge lamp, a lamp voltage detector configured to detect a voltage applied to the high-intensity discharge lamp, a lamp status determination unit configured to determine whether the high-intensity discharge lamp is in a turned-on state, based on the voltage detected by the lamp voltage detector, an auxiliary lamp switching element configured to connect the power source and an auxiliary lamp having a rated voltage, and a controller configured to control the auxiliary lamp switching element so as to apply to the auxiliary lamp a voltage substantially equal to the rated voltage of the auxiliary lamp when the high-intensity discharge lamp is supplied with the power and the lamp status determination unit determines that the high-intensity discharge lamp is not in the turned-on state.

REFERENCES:
patent: 4034259 (1977-07-01), Schoch
patent: 6426597 (2002-07-01), Rast et al.
patent: 6448720 (2002-09-01), Sun
patent: 6489729 (2002-12-01), Erhardt et al.
patent: 6781316 (2004-08-01), Oda

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