Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1975-10-07
1976-11-02
La Roche, Eugene
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315194, 315258, 315283, 315DIG4, H05B 4138
Patent
active
039899764
ABSTRACT:
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.
REFERENCES:
patent: 3369150 (1968-02-01), Malmin
patent: 3816794 (1974-06-01), Snyder
patent: 3875458 (1975-04-01), Kappenhagen
patent: 3875460 (1975-04-01), Kappenhagen
patent: 3894265 (1975-07-01), Holmes et al.
La Roche Eugene
Palmer W. D.
Westinghouse Electric Corporation
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