Ballast circuit for metal halide lamp

Details Ballast circuit for metal halide lamp Ballast circuit for metal halide lamp

1988-02-26

1990-02-27

Mis, David

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315290T, 315226, 315310, 315DIG7, H05B 4136

Patent

active

049049070

ABSTRACT:
A ballast circuit and method of operating gas discharge lamps are disclosed. The ballast circuit generates a relatively low frequency regulated square-wave current which advantageously provides for operating the gas discharge lamps during their run mode. The square-wave current delivered to the electrodes of the gas discharge lamp reduces or substantially eliminates the cataphoresis effects typically created by D.C. and 60 Hz operation of the gas discharge lamp while also reducing or substantially eliminating the detrimental acoustics resonance effects typically created by operating the gas discharge lamps at relatively high frequency of excitations.

REFERENCES:
patent: 4042856 (1977-08-01), Steigerwald
patent: 4170746 (1979-10-01), Davenport
patent: 4350930 (1982-09-01), Peil et al.
patent: 4373146 (1983-02-01), Bonazoli et al.

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