Closed loop daylight harvesting light control system having...

Details Closed loop daylight harvesting light control system having... Closed loop daylight harvesting light control system having...

2006-05-05

2009-10-27

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S2140AL, C315S156000, C315S158000

Reexamination Certificate

active

07608807

ABSTRACT:
An apparatus and method for enabling an automatic calibration sequence for a light control system having a daylight harvesting scheme is disclosed herein. An ambient light sensor connects to a detection circuit for detecting the amount of ambient light within a given zone. A microprocessor connects between the detection circuit and a dimming circuit for providing control to initiate dimming and to start the auto-calibration sequence. Responsive to the amount of ambient light detected, the dimming circuit controls the power supplied to a plurality of electrical loads. A storage unit connects to the microprocessor for storing minimum light levels assessed during the auto-calibration sequence wherein the ambient light levels are monitored for a predetermined amount of time to determine the lowest level of ambient light generated for the purpose of setting and storing a target voltage level associated with such.

REFERENCES:
patent: 4135116 (1979-01-01), Smith
patent: 4273999 (1981-06-01), Pierpoint
patent: 4347461 (1982-08-01), Carlson
patent: 5648656 (1997-07-01), Begemann et al.
patent: 6388399 (2002-05-01), Eckel et al.

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