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US 4,538,672 AGranted
Tracking temperature controller apparatus
AssigneeConoco Inc.
InventorsRaymond C. Overton, Charles F. Cole
Life of this patent
Estimating the term…
Abstract
Apparatus for controlling temperature in accordance with a source temperature that includes a clock pulse generating circuit that triggers each of first and second mono-stable multivibrators which provide opposite phase pulse outputs having durations controlled by the R-C time of thermistor sensing components. A retriggerable monostable multivibrator is then controlled in response to pulse duration difference to provide toggle energization of heating and cooling sources.
Claims8
Temperature control apparatus, comprising:
- clock means generating first and second clock pulses simultaneously in opposite polarity;
- first means including a first thermistor, triggered by said first clock pulse and generating a first pulse output with duration controlled by said first thermistor;
- second means including a second thermistor, triggered by said second clock pulse and generating a second pulse output with duration controlled by said second thermistor;
- gate means receiving input of said first and second pulse outputs to generate a control pulse output having a duration equal to any difference between terminations of said first and second pulses;
- control means energized by said control pulse output to generate a heating pulse output for the duration, and de-energized to generate an alternate cooling pulse when there is no control pulse output;
- and
- heating and cooling means responsive respectively to said heating and cooling pulse outputs.
4 more elements
Dependencies are inferred from the claim text.