H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/28, 355/51
H05B 37/02 (2006.01) H05B 39/02 (2006.01) H05B 39/04 (2006.01) H05B 39/08 (2006.01) H05B 41/392 (2006.01)
Patent
CA 1175948
ABSTRACT OF THE DISCLOSURE A lighting feedback control system for applying AC power to at least one lamp, which includes a conduction angle controlled phase switching cir- cuit connected in series with the lamp and an AC power source for switching power across the lamp, and a line switching circuit for enabling the appli- cation of AC power to the lamp through the phase switching circuit. A light sensor is provided for generating a light control signal indicative of the amount of ambient light present in the predetermined location. Coupled to the light sensing circuit is a phase angle conduction control circuit which generates and applies to a control terminal of the phase switching circuit a phase control signal to control the phase angle conduction time of the phase switching circuit based on the amount of ambient light measured by the light sensing circuit to maintain a constant level of lighting. Integrated within the phase angle conduction control circuit is an RC filter circuit which gradually increases the phase angle conduction time switching circuit from zero, or a predetermined minimum value, to a steady state phase angle conduction time based on the ambient light conditions sensed by the light sensing circuit, after power enabling by the line switching circuit. - 26 - - 26 -
378420
Hoge Henri H.
Swabey Ogilvy Renault
LandOfFree
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