Temperature probe conditioner circuit
AssigneeAppliance Control Technology, Inc.
InventorGary L. Hesse
Life of this patent
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Abstract
A temperature probe conditioner, while developing a voltage output proportional to probe temperature, generates a verify and a calibration output. A verify output to check the correctness of the conditioner's output voltage and a calibration output to confirm the range of the conditioner as well as to calibrate the port of an external circuit. These signals are connected to a microprocessor or similar device which makes decisions on whether to turn cooking elements "on" or "off" or to stop due to detected errors.
Claims8
A temperature probe conditioner circuit connected between a temperature sensitive probe comprising a variable resistor operated to different resistance values in response to the presence different temperatures and a signal processor comprising a microprocessor connected to a source of reference voltage and including analog to digital inputs connected to receive a calibrate signal, to receive a verify signal and to receive an oven signal, said conditioner comprising:
- a first operational amplifier connected to said source of reference voltage, and including output circuit connections to said signal processor, to a second operational amplifier and to a third operational amplifier;
- said first operational amplifier operated to generate said calibrate signal;
- said second operational amplifier including circuit output connections to said probe, to said signal processor and to said third operational amplifier, said second operational amplifier operated in response to said calibrate signal to generate said verify signal;
- said third operational amplifier including an output circuit connection to said signal processor, operated in response to said calibrate signal and said verify signal to generate said oven signal.
Dependencies are inferred from the claim text.