Photo electric methods and apparatus for regulating electrical p

Details Photo electric methods and apparatus for regulating electrical p Photo electric methods and apparatus for regulating electrical p

1979-03-15

1980-10-21

Hix, L. T.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307157, 315154, H05B 3702, H01H 4724

Patent

active

042296641

ABSTRACT:
In the disclosed apparatus, a photo diode has an electrical impedance representative of the ambient light intensity. An amplifier connects to this photo diode and converts the impedance to an analog signal whose magnitude indicates the ambient light intensity. The analog signal is compared via a first comparator with one reference voltage corresponding to the magnitude of analog signal that is generated by cloudy weather, and via another comparator to a reference voltage corresponding to the magnitude of signal that is generated at dusk. The first comparator operates to energize all window light in cloudy weather; and the second comparator operates to energize parking lot lights and electric signs at dusk. The second comparator also activates a timer which, after a manually selectable delay, de-energizes a uniformly distributed portion of all interior overhead lighting.

REFERENCES:
patent: 3080491 (1963-03-01), Howell
patent: 3989980 (1976-11-01), Berman
patent: 4122334 (1978-10-01), Owens

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