Fast run-up of metal halide lamp by power modulation at...

Details Fast run-up of metal halide lamp by power modulation at... Fast run-up of metal halide lamp by power modulation at...

2007-09-25

2009-12-15

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S291000, C315S246000, C315S2090SC, C315SDIG002

Reexamination Certificate

active

07633237

ABSTRACT:
A method of controlling run-up of a metal halide lamp that has a nominal (full) light output during steady state operation and that has a current limit Ilim, includes, during run-up of the metal halide lamp to steady state operation, evaluating requested power Preqand requested current Ireqto operate the lamp at the nominal light output Lnduring the run-up, supplying Ilimto operate the lamp so long as Ireq≧Ilimand supplying Preqto operate the lamp when Ireq<Ilim, and modulating power P supplied to the lamp. The power modulation is preferably at an acoustic resonance frequency of the lamp, such as the first azimuthal resonance mode of the lamp. Power modulation may include sweeping a sine wave ripple on top of an input voltage waveform, wherein a frequency range of the sine wave ripple includes an acoustic resonance frequency.

REFERENCES:
patent: 5017839 (1991-05-01), Arlt et al.
patent: 5684367 (1997-11-01), Moskowitz et al.
patent: 6124683 (2000-09-01), Olsen et al.
patent: 6229269 (2001-05-01), Olsen
U.S. Appl. No. 11/860,759, filed Sep. 25, 2007.

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