Electric lamp and discharge devices: systems – Automatic substitution of the load device or electrode
Patent
1975-11-03
1977-09-06
Dahl, Lawrence J.
Electric lamp and discharge devices: systems
Automatic substitution of the load device or electrode
315 91, 315 92, 315182, H05B 3700
Patent
active
040470768
ABSTRACT:
This invention pertains to an emergency lighting circuit that operates with a high pressure, gaseous-discharge lamp and associated ballast. When the gaseous-discharge lamp goes out, after once being ignited, sufficient current is supplied to an incandescent light or lights to maintain illumination to the area normally illuminated by the lamp. The device for providing this current may vary, but generally incorporates a voltage breakdown means that receives higher voltage from the ballast when there is failure of the gaseous-discharge lamp than when the arc therein is struck. A preferred embodiment also lights the incandescent lights during initial warm-up of the gaseous-discharge lamp. The incandescent lights may also be used in a cold environment to maintain the gaseous-discharge lamp sufficiently above an ambient temperature level to make possible initial striking of the arc in the lamp when ambient temperature conditions might otherwise prevent it. Further, half-cycles of ballast output voltages are blocked by diodes and capacitors are used to increase the applied voltage to enhance restriking of the gaseous-discharge lamp in additional embodiments.
REFERENCES:
patent: 1970519 (1934-08-01), Dorgelo
patent: 2043023 (1936-06-01), Westendorp
patent: 2076278 (1937-04-01), Ryde et al.
Galloway, J. H. - "Using the Triac for Control of AC Power" -- General Electric Application Note 200.35, 3/66, p. 15.
Stern-"Silicon Controlled Rectifiers-New Applications in the Home"--Electronics World, pp. 27-30, 82: Oct. 1963.
Silicon Controlled Rectifier Manual (Gen. Elec.), pp. 89-90, (1961).
Transistor Manual (Gen. Elec.), p. 331 (1964).
Dahl Lawrence J.
Esquire, Inc.
LandOfFree
Emergency lighting system for gaseous discharge lamps does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Emergency lighting system for gaseous discharge lamps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Emergency lighting system for gaseous discharge lamps will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2164842