Method and apparatus for lighting high pressure discharge...

Details Method and apparatus for lighting high pressure discharge... Method and apparatus for lighting high pressure discharge...

2006-01-10

2006-01-10

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S308000

Reexamination Certificate

active

06984943

ABSTRACT:
A lighting method for a high pressure discharge lamp in which a high-pressure pulse is applied to cause a dielectric breakdown, and then in step S1, it is judged whether the lamp voltage is higher than 25 volts as the current switching voltage. If it is judged negatively in step S1, the control circuit (304) performs a constant current control with the current limiting level set to 6 amperes (step S2). If it is judged that the lamp voltage is higher than 25 in step S1, the control circuit (304) performs a constant current control with the current limiting level set to 4 amperes (step S3). When the lamp voltage rises and reaches 50 volts, the control circuit (304) performs a constant power control so that the lamp power remains to be 200 W.

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