Air conditioner clutch control device

Details Air conditioner clutch control device Air conditioner clutch control device

1986-04-07

1988-05-24

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

H01H 4726

Patent

active

047470097

ABSTRACT:
An air conditioner clutch control device includes a resistive type temperature sensor, connected to power dividers for providing a threshold voltage and a trigger voltage for first and second comparators. Resistor type power dividers provide first and second reference voltages to the comparators. Logic circuits are attached to the comparators for providing first and second state signals. Thus, when the temperature exceeds the first reference the first state is produced to turn on the air conditioner; when the temperature falls below the second reference, the second state is produced to turn off the air conditioner. A zener diode is provided to protect the logic circuits from transients in the battery source of power and from a reversal in polarity. A coil of a relay switch is operated by the first and second states to close a switch to energize a coil of a relay switch of an air conditioner's compressor. The coil of the relay switch protects the logic circuits from self-induced transients and a diode protects the logic circuits from excess positive voltage. The coil of the relay switch of the air conditioner is, for positive switching, connected permanently to ground and the positive end is switched and for negative switching, connected permanently to the battery source of power and the negative end is switched.

REFERENCES:
patent: 4254906 (1981-03-01), Hayes
patent: 4630165 (1986-12-01), D'Onofrio
G. R. Lewis, Low-cost Temperature Controller Built with Timer Circuit, Aug. 16, 1975, Electronic Design, 17.
Elektor, vol. 9, No. 7/8, Jul./Aug. 1983, pp. 7-66, 7-67, Canterbury, Kent, Great Britain, "Interior Temperature Control for Cars".
Electrical Design, vol. 30, No. 16, Aug. 1982, pp. 217, Denville, N.J., U.S.A., R. S. Rohella, "Dual-Time Chip Control Temperature While Monitoring Liquid Level".

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