Light-sensitive switch structure and method with inverse off/on

Details Light-sensitive switch structure and method with inverse off/on Light-sensitive switch structure and method with inverse off/on

1986-02-11

1988-09-13

Miska, Vit W.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

250206, 250214AL, 361175, H01H 3500, H01H 4724, H01J 4014

Patent

active

047711868

ABSTRACT:
Light-sensitive switch structure for and method of turning a street light, or other load, on or off in response to varying light levels. The switch is designed to recognize the daily variations in light level and is capable of switching a load off at a light level lower than that at which the load is switched on. In a preferred embodiment the switch consists of a photo-sensitive element, two relays with time delay features, and two current limiting resistors to regulate the current flowing through the operating coils of the relays. In other embodiments wherein the values of the circuit components are properly selected one of the resistors regulating the current flowing through the operating coils of the relays may be eliminated. In accordance with the method of the invention one of the relays operates contacts which energize or de-energize the load, while the other relay operates contacts which connect or disconnect the resistors to or from the operating coils of the relays. The resistors function in concert with the varying resistance of the photo-sensitive element to provide the desired operation of the relays to effect the desired energizing of the load with an inverse light level ratio.

REFERENCES:
patent: 3351762 (1967-11-01), Adkins et al.
patent: 3529214 (1970-09-01), Corn
patent: 3629649 (1971-12-01), Del Zotto
patent: 3636357 (1972-01-01), Del Zotto
patent: 3916183 (1975-10-01), Duve et al.
patent: 4095100 (1978-06-01), Selick
Radio and Electronics Constructor, June 1980, pp. 604-608.

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