Accession Number : ADD005957

Title :   Constant Illumination Control System.

Descriptive Note : Patent,


Personal Author(s) : Smith,Maurice N

Report Date : 16 Jan 1979

Pagination or Media Count : 10

Abstract : A constant illumination level control system for continuously adjusting the level of artificial illumination in an area of controlled lighting to complement available natural illumination. A photocell sensor in combination with an input amplifier generates a voltage representative of the illumination level in the area of controlled lighting. This illumination level voltage is compared by a comparator with a reference voltage, a non-zero difference voltage output from the comparator being indicative of a change in the illumination level from a desired, preset level. The output from the comparator is applied to a solid state dimmer circuit which, by controlling the gating of a triac, regulates the electrical energy input to the artificial lighting system. In response to a non-zero difference voltage output from the comparator, the solid state dimmer circuit, in combination with the triac, adjusts the artificial illumination output to reestablish the desired, present level of total illumination. (Author)

Descriptors :   *Patents, *Lighting equipment, *Control systems, Illumination, Level(Quantity), Cells, Photodetectors, Amplifiers, Voltage, Solid state electronics, Circuits

Subject Categories : Air Condition, Heating, Lighting & Ventilating
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE