Lamp modulation circuit having a feedback for measuring lamp tem

Details Lamp modulation circuit having a feedback for measuring lamp tem Lamp modulation circuit having a feedback for measuring lamp tem

1997-04-02

1999-01-12

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315224, 315307, 315309, H05B 3702

Patent

active

058595031

ABSTRACT:
A lamp drive circuit periodically energizes a lamp above its rated voltage and current for rapid illumination of the lamp. In the preferred embodiment, the lamp is connected in a voltage divider and the circuit monitors the voltage drop across the lamp. The voltage drop is indicative of the lamp resistance and thereby the temperature. When the voltage drop reaches a predetermined limit corresponding to the temperature rating of the lamp, it is de-energized and allowed to cool during the remainder of the cycle thereby enabling a high modulation frequency.

REFERENCES:
patent: 4902958 (1990-02-01), Cook

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