Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Discharge control discharge device load controlled by the...
Patent
1993-11-23
1995-03-28
Pascal, Robert J.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Discharge control discharge device load controlled by the...
315156, 315158, 315149, 315291, 315DIG4, H05B 3702
Patent
active
054020409
ABSTRACT:
A control circuit for controlling the light output level of a dimmable fluorescent light ballast such as the Mark VII ballast manufactured by Advance Transformer, Inc. The circuit operates from power supplied by the Mark VII ballast through a 300 to 500 microamp DC current loop. The control circuit includes a photo sensor that detects the level of ambient light in a room, and in response to the detected light level, the circuit sets a voltage level from 2 and 10 volts between the two output leads for the current loop on the ballast. At 2 volts, the light is at its dimmest level, which is 20 percent of its maximum brightness, while at 10 volts, the light is at the 100 percent level. Between 2 and 10 volts, the light's brightness is set on a linear scale between 20 and 100 percent.
REFERENCES:
patent: 3999100 (1976-12-01), Dendy et al.
patent: 4016451 (1977-04-01), Engel
patent: 4249160 (1981-02-01), Chilvers
patent: 4628230 (1986-12-01), Krokaugger
Instructions for installation and diagram of circuit believed to be used in the Celestial Sensor manufactured by MultiPoint Lighting Control Systems.
Pascal Robert J.
Ratliff Reginald A.
The Watt Stopper
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