Time controlled light dimmer

Details Time controlled light dimmer Time controlled light dimmer

1981-07-17

1983-01-11

Dixon, Harold A.

Electric lamp and discharge devices: systems

Time-controlled

3403091, 364145, 364569, H05B 3702

Patent

active

043684084

ABSTRACT:
A method and apparatus for dimming traffic lights during hours of darkness to conserve energy. Electronic circuitry provides storage for weekly tables of twilight times for particular geographic locations covering an extended time period, such as one year. Counting apparatus counts weeks for addressing the stored tables, and an AM/PM indicator further differentiates between stored sunrise and sunset times. The stored time is compared in a comparator with the present time, and logic circuitry, responsive to the AM/PM indicator, reacts to the results of the comparison by activating and deactivating a dimmer for the traffic lights.

REFERENCES:
patent: 1964846 (1934-07-01), Earnshaw
patent: 3299401 (1967-01-01), Bolton
patent: 4217646 (1980-08-01), Caltagirone et al.

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