Automatic lighting control system

Details Automatic lighting control system Automatic lighting control system

1978-09-18

1980-11-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

315154, H01J 4014

Patent

active

042335450

ABSTRACT:
This invention relates to an automatic lighting control system which employs a photosensitive detector in one leg of a bridge circuit for sensing the total effective level of both the natural and artificial illumination within an interior space. The unbalanced output of the bridge is fed into a pair of differential comparators for deriving a digital error signal representative of the level of illumination falling outside an acceptable range. A digital error signal is loaded into an intermediate shift register responsive to a clock signal. If an error signal of the type requiring a change in illumination is present, then a subsequent clock pulse will command a shift register to add or interrupt power to one or more lighting modules which supply artificial illumination to the interior space.

REFERENCES:
patent: 4122334 (1978-10-01), Owens

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