Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1981-02-19
1983-08-02
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315195, 315199, 315293, 315294, 323322, H05B 3702
Patent
active
043968716
ABSTRACT:
The invention relates to an arrangement for digital brightness control of lamps or groups of lamps in control channels particularly for use in planetarium illumination comprising in each control channel a programmable counter, a bistable flip-flop, and a power control stage. Each control channel is connected to a mains synchronizing stage and to a pulse generator. The control channel produces a mains synchronous pulse sequence frequency the pulse width repitition ratio of which depends on the selected division ratio of the programmable counter. The inventional solution offers a simple digital and controllable circuit arrangement for control of thyristors or triacs or transistors which, in turn, control the brightness of lamps or lamp groups.
REFERENCES:
patent: 4241295 (1980-12-01), Williams
patent: 4287468 (1981-09-01), Sherman
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