Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Electric switch controlled by the radiant energy responsive...
Patent
1999-06-15
2000-11-07
Wong, Don
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Electric switch controlled by the radiant energy responsive...
34082506, 362802, H05B 3702
Patent
active
061441619
ABSTRACT:
A photocell unit in combination with a programmed microprocessor which samples the output of the photocell and detects day or night by sampling over a predetermined period of time, e.g. 80 minutes to establish a right reference value and a predetermined number of samples of increasing light values to establish a "sunrise detect value" to turn lights off. A further predetermined increase in light values is used to establish a "sunset detect" light value. This value is retained throughout the day until sensed light values again diminish to the "sunset. The sampling techniques makes the system immune from errors due to transient lights and also avoid unwanted daylight operation of lights or undetected light outages.
REFERENCES:
patent: 4598286 (1986-07-01), Miller et al.
patent: 5637964 (1997-06-01), Hakkaraimen et al.
patent: 5719555 (1998-02-01), Zeytoonjian et al.
Arellanes Arthur Y.
Kimmich David
Inform 2000
Smith Robert C.
Tran Thuy Vinh
Wagner John E
Wong Don
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