Projector lamp control for increased lamp life

Details Projector lamp control for increased lamp life Projector lamp control for increased lamp life

2006-05-23

2008-10-07

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S308000

Reexamination Certificate

active

07432667

ABSTRACT:
An electronic lamp control system for life time extension of a DC high intensity discharge lamp has a light sensor (130) for sensing an output of a lamp (31), a power supply (110) for the lamp (31), and a controller (20) for controlling the power supply (110). The controller (20) has a high pass filter (20c) for compensating for a leading edge of a detected change in lamp power output caused by each arc displacement. Lamp life is extended since damage to the lamp electrodes by the arc displacements is reduced. The system can have multiple lamps for the same illumination area, or multiple channels for illuminating different areas, coupled to provide uniform illumination. The controller (20) can compare a sensed level to a reference, to output a level control signal, then add a correction signal from the high pass filter to the level control signal.

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