Time-delay outdoor lighting control systems

Details Time-delay outdoor lighting control systems Time-delay outdoor lighting control systems

1988-05-13

1991-02-05

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361173, 315159, H01H 4726

Patent

active

049910540

ABSTRACT:
An optical lighting control, such as that used to control street lamps, delays the response of the lamps to changes of illumination while the lamps are on at night but avoids the delay in response to daylight. Thus, headlamps, flashlights, and lightning flashes of brief duration do not cause the control to turn off the street lamps. However, the street lights turn off without this delay in response to daylight.

REFERENCES:
patent: 3351762 (1967-11-01), Adkins et al.
patent: 4207501 (1980-06-01), Smallegan
patent: 4771186 (1988-09-01), Basso
SL Application Notes, Sensor Labs, Inc., (undated).
Fenwal Electronics, Thermistor Manual, 1974, pp. 1, 4, 5, 6, 9 & 10.
Midwest Components Inc., General Characteristics of Thermistors.
Midwest Components Inc., Switching Thermistors, pp. 4 & 5.
Keystone NTC & PTC Thermistors & Probe Assemblies, 1984, pp. 1, 9, 11, 12, 37, 38 & 39.
Murata Erie No. America, Posistors for Circuit Protection, 1986, pp. 1 & 5.

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