Starting circuit for electric discharge lamp

Details Starting circuit for electric discharge lamp Starting circuit for electric discharge lamp

2008-07-08

2008-07-08

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S051000

Reexamination Certificate

active

07397204

ABSTRACT:
A starting circuit for an electric discharge lamp providing an electric current to a lamp having a first and a second filament. The circuit measures a lamp current and a filament temperature and then compares these against a reference voltage. When the lamp current is below a set threshold value, a relay contact disposed between the first and second filament is closed to direct the electric current through the first and second filaments to initiate pre-heating of the lamp. Once the filament temperature exceeds a set threshold, the relay contact is opened and the electric current passes through heated gas inside the lamp.

REFERENCES:
patent: 6114816 (2000-09-01), Nuckolls et al.
patent: 6597118 (2003-07-01), Arimoto et al.

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