Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1994-06-07
1995-12-26
Pascal, Robert J.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315DIG7, 315224, 315209R, H05B 3702
Patent
active
054790760
ABSTRACT:
A restart circuit for a dc arc lamp, which is subject to power variations that cause the lamp to extinguish, includes a power circuit for supplying the dc arc lamp with current that has a constant current value while the lamp is operating. A current monitor connected to the power circuit monitors the current supplied to the dc arc lamp and provides a current sense signal corresponding to the supplied current. A comparator, which is connected to receive the current sense signal, provides a restart signal having a hysteresis characteristic. The restart signal is activated when the current sense signal falls a first predetermined value below the constant current value (indicating that the lamp has extinguished) and deactivated when the current sense signal rises above a second predetermined value greater than said first predetermined value, but still less than the constant current value. An ignition circuit responsive to the restart signal then supplies the dc arc lamp with an ignition voltage to restart the lamp.
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Eastman Kodak Company
Pascal Robert J.
Vu David H.
Woods David M.
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