Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Reexamination Certificate
2006-12-12
2006-12-12
Vo, Tuyet Thi (Department: 2821)
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
C315S149000, C315S311000, C315S307000, C315S320000
Reexamination Certificate
active
07148628
ABSTRACT:
A method and circuit arrangement dynamically calibrate a photosensitive control for a light source that includes a voltage divider circuit coupled to a resistive light detector and configured to output to a comparison circuit a variable voltage signal that varies with the resistance of the resistive light detector. To calibrate the photosensitive control, a variable impedance circuit in the voltage divider circuit is adjusted to null out any changes in voltage caused by feedback from the controlled light source. The amount of correction is proportional to the amount of light feedback. Based on the amount of correction needed, a new reference voltage is selected that will accurately detect the next dusk to dawn transition while the light feedback is present.
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Cornett Roger Dennis
McCavit Kim Irwin
Raper William C.
Desa IP LLC
Middleton & Reutlinger
Salazar John F.
Vo Tuyet Thi
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