The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 1988
Filed:
Apr. 07, 1986
Jimmie D Gillett, Garland, TX (US);
Richard R Garcia, Plano, TX (US);
Ranco Electronics Division, Irving, TX (US);
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.