Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1997-04-30
1999-04-20
Paladini, Albert W.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
315159, 315360, 250214AL, 302276, H05B 3910
Patent
active
058959866
ABSTRACT:
A photoelectric load control system for applying power to a light or load as a function of ambient light level and as a function of the length of daylight or darkness. The system includes a switching circuit for selectively applying power to the light or load for turning the light or load on and off; an ambient light level sensor for providing a signal which varies between a first state and a second state in response to the ambient light level; and a uniquely programmed processor responsive to this signal for activating the switching circuit. The processor includes a routine for activating the switching means to turn the light or load on in response to one of the states, a timing routine for timing the total darkness period, a counter for counting the period of darkness or daylight, a routine for determining when the count exceeds a predetermined percentage of the total darkness or daylight period, and a routine for activating the switching circuit to turn the light or load off or on after the count equals or exceeds the predetermined percentage of the darkness or daylight period.
REFERENCES:
patent: 4008415 (1977-02-01), De Avila-Serafin et al.
patent: 4236101 (1980-11-01), Luchaco
patent: 4237377 (1980-12-01), Sansum
patent: 4587417 (1986-05-01), Duve et al.
patent: 4731551 (1988-03-01), Gibbs et al.
Seigel Lucinda
Walters Jeff D.
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