Apparatus for controlling the intensity of a light source

Details Apparatus for controlling the intensity of a light source Apparatus for controlling the intensity of a light source

1974-11-27

1976-07-06

Kominski, John

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Pre-selectable regulator systems

307222R, 328 44, 328 48, 315291, H05B 41392

Patent

active

039684016

ABSTRACT:
An enabling circuit selectively generates first, second and third enabling signals. The first enabling signal enables a pulse generator means which generates a train of clock pulses. The second enabling signal enables a gating means which applies the clock pulses generated by the pulse generator means to the up input terminal of an up/down counter. The third enabling signal enables a gating means which applies the clock pulses generated by the pulse generator means to the down input terminal of the up/down counter. The up/down counter evaluates the difference between the number of clock pulses applied to its up input terminal and the number of clock pulses applied to its down input terminal and generates a digital signal representative of the evaluation. Finally, digital to analog converter means generates an analog output control signal whose magnitude is determined by the digital generated by the up/down counter.

REFERENCES:
patent: 3206665 (1965-09-01), Burlingham
patent: 3238462 (1966-03-01), Ballard et al.
patent: 3560859 (1971-02-01), Thompson
patent: 3579122 (1971-05-01), Paine
patent: 3706914 (1972-12-01), Van Buren
patent: 3763394 (1973-10-01), Blanchard

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