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Temperature detector

  • US 4,650,347 A
  • Filed: 08/05/1985
  • Issued: 03/17/1987
  • Est. Priority Date: 12/21/1981
  • Status: Expired due to Fees
First Claim
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1. A detecting device comprising:

  • a first circuit portion including an electrical detecting element whose resistance varies according to changes in a parameter to be detected and a variable voltage dividing circuit connected in series with said detecting element, said variable voltage dividing circuit having at least two resistance elements connected in series with each other and at least one switching means connected in parallel with those resistance elements of said at least two resistance elements which are other than at least one thereof in order to selectively vary the resistance of the variable voltage dividing circuit,a direct-current power supply for applying direct-current power to said first circuit portion,a switching control means for maintaining said switching means in conduction for a predetermined period of time with a predetermined cycle, anda comparison means for comparing a first divided voltage at a point of connection between said detecting element and said variable voltage dividing circuit with a standard voltage, the results of such comparison indicating detection of the change in the parameter.

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