Operating method and operating apparatus for a high pressure dis

Details Operating method and operating apparatus for a high pressure dis Operating method and operating apparatus for a high pressure dis

1997-10-20

1999-12-21

Shingleton, Michael B

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315 82, 315224, 315176, 315DIG7, H05B 3702

Patent

active

060053569

ABSTRACT:
A method and apparatus for operating a high pressure discharge lamp is disclosed. Oscillation in the discharge arc periphery, a problem that occurs with high frequency operation, is eliminated. A high pressure discharge lamp is operated by applying thereto a dc or rectangular wave current to which is superposed an ac component shaped by a high frequency ripple signal that has been amplitude modulated by a modulation signal for inducing instantaneous fluctuations in the power supply input to both ends of the arc gap. The ripple level is thereby temporally varied, and stable operating is possible even when exceeding the ripple level at which oscillation in the arc periphery begins.

REFERENCES:
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patent: 5047695 (1991-09-01), Allen et al.
patent: 5121034 (1992-06-01), Allen et al.
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patent: 5436533 (1995-07-01), Fromm et al.
patent: 5684367 (1997-11-01), Maskowitz et al.
patent: 5773937 (1998-06-01), Miyazaki et al.
H.P. Stormberg et al., "Excitation of Acoustic Instabilities in Discharge Lamps with Pulsed Supply Voltage" Lighting Research and Technology, vol. 15, No. 3, Mar. 1983, pp. 127-132.

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