Instant-on light source

Details Instant-on light source Instant-on light source

1979-12-03

1981-07-14

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Automatic substitution of the load device or electrode

Diverse-type load device or electrode substituted

315 49, 315 64, 315 73, 315 91, 315311, H05B 4136, H05B 4146

Patent

active

042789168

ABSTRACT:
A light source includes a high pressure discharge lamp and incandescent filaments which provide illumination during the warm-up and hot restart periods associated with the discharge lamp. A current regulator, which provides dc power to the discharge lamp, draws sufficient current through one filament to energize the filament only during discharge lamp warm-up. A second filament provides illumination during the period after the occurrence of a momentary power failure or power transient which is required by the discharge lamp to cool down to its maximum starting temperature. A bimetal switch permits current flow through the second filament when the discharge lamp is above the maximum starting temperature. An electronic switch permits current flow through the second filament when a current sensing resistor senses a lack of current through the discharge lamp.

REFERENCES:
patent: 3517254 (1970-06-01), McNamara
patent: 3536954 (1970-10-01), Haymaker et al.
patent: 3693045 (1972-09-01), Price
patent: 3737719 (1973-06-01), Nodurft
patent: 3737720 (1973-06-01), Willis
patent: 4005331 (1977-01-01), Horowitz
patent: 4151445 (1979-04-01), Davenport
patent: 4170744 (1979-10-01), Hansler
Schriff, Solid-State Ballasting of Mercury-Arc Lamps, RCA Application Note AN-3616, Nov. 1973, pp. 776-788.

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