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Selective temperature control system

  • US RE33,119 E
  • Filed: 03/07/1988
  • Issued: 11/28/1989
  • Est. Priority Date: 12/31/1979
  • Status: Expired due to Fees
First Claim
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1. A method of determining the temperature to which a thermistor is exposed utilizing a capacitor, a reference resistor, means coupled to the capacitor and actuable to selectively charge the capacitor through either of the reference resistor and the thermistor, means actuable to discharge the capacitor and timing means coupled to the capacitor, comprising the steps:

  • (a) actuating the charging means to charge the capacitor through the reference resistor;

    (b) operating the timing means to measure the length of time required to charge said capacitor to a predetermined level to obtain a reference charge time;

    (c) actuating the discharging means to discharge the capacitor;

    (d) actuating the charging means to charge said capacitor through said thermistor;

    (e) operating the timing means to measure the length of time required to charge said capacitor to said predetermined level through said thermistor to obtain a temperature charge time; and

    (f) computing the difference between the reference charge time and the temperature charge time and dividing the difference by the sum of said reference charge time and said temperature charge time to determine the temperature to which said thermistor is exposed.

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