Driving scheme for minimizing ignition flash

Details Driving scheme for minimizing ignition flash Driving scheme for minimizing ignition flash

1996-05-03

1997-10-21

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315307, 315224, 315209R, 315DIG4, G05F 100

Patent

active

056800177

ABSTRACT:
A ballast for powering a lamp at deep dim levels. Driving circuitry includes a feedback loop which compares a desired dim level to a signal representing actual lamp power consumption. The loop is closed once the signal representing actual lamp power consumption equals the desired dim level. During ignition, a switch in response to the lamp voltage reaching or exceeding a predetermined threshold opens the feedback loop. The feedback loop is closed once the lamp has been ignited. By closing the loop as soon as the lamp has been ignited, ignition flash is minimized.

REFERENCES:
patent: 4952849 (1990-08-01), Fellows et al.
patent: 5003230 (1991-03-01), Wong et al.
patent: 5373435 (1994-12-01), Jayaraman et al.
patent: 5449981 (1995-09-01), Auld, Jr et al.
patent: 5550437 (1996-08-01), Hopkins et al.
patent: 5559395 (1996-09-01), Venkitasubrahmanian et al.

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