Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1985-08-05
1986-12-09
Dixon, Harold
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315194, 315199, 315291, 315DIG4, H02B 3702
Patent
active
046282300
ABSTRACT:
A regulated light dimmer control circuit which is particularly suitable for use in controlling the level of illumination of lights in a sound stage environment such as a motion picture set television studio or sound studio. A variable D.C. voltage source is utilized as the dimmer control usually located within the studio and manually controlled by an operator. The D.C. output of the dimmer control is fed to a voltage regulator and controller which receives an output from a timing circuit having a periodic waveform output which is synchronized with the A.C. power line and provides a trigger signal for a solid state relay when the D.C. fed from the dimmer control to the voltage controller is equal to or greater than the output of the timing circuit. Thus, the solid state relay will be fired for a portion of the A.C. period which is in accordance with the D.C. voltage set on the dimmer control. A.C. from the power line is fed through the solid state relay when this relay is being actuated to a rectifier and filter circuit which converts the A.C. to D.C. and appropriately filters the rectified D.C., this D.C. voltage being fed to the lamps being controlled. Negative feedback is provided from the output of the rectifier and filter circuit to a feedback amplifier to the voltage regulator and controller to regulate the D.C. provided to the lamps.
REFERENCES:
patent: 3684919 (1972-08-01), Cramer
patent: 3845350 (1974-10-01), Luursema
patent: 4001637 (1977-01-01), Gray
patent: 4219761 (1980-08-01), Mustoe
patent: 4300075 (1981-11-01), Foose et al.
patent: 4395660 (1983-07-01), Waszkiewicz
"SCR Manual" Fifth Edition p. 252 (1972).
Dixon Harold
Mole-Richardson Company
Sokolski Edward A.
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