H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/44
H05B 41/231 (2006.01) G05F 1/445 (2006.01) H05B 41/38 (2006.01) H05B 41/392 (2006.01)
Patent
CA 1040701
SOLID-STATE HID LAMP DIMMER ABSTRACT OF THE DISCLOSURE Lighting control apparatus for controlling the light intensity of high-intensity-discharge (HID) lamps operated from an AC source while eliminating the tendency for such lamps to extinguish during the dimming thereof. The apparatus comprises a variable reactive ballast controlled with respect to its reactance by a solid-state switching device which is responsive to a timed control signal provided by a signal generating device operating from the same AC source. A lamp voltage sensing device develops a feedback signal which varies in accordance with the voltage drop across the lamps being ballasted. A signal sensing and overriding device combines the feedback signal and the timed controlled signal and causes the feedback signal to override the timed control signal before the lamp voltage reaches such value as might cause the lamp to extinguish. In this manner, when the lamp is dimmed and its voltage tends to rise, the voltage rise is automatically compensated for by an increase in power to the lamp which in turn decreases the voltage drop across the lamp so that the tendency of the lamp to extinguish during dimming thereof is eliminated.
260732
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