TEMPERATURE-SENSITIVE CONTROL CIRCUIT

  • US 3,825,778 A
  • Filed: 02/09/1973
  • Issued: 07/23/1974
  • Est. Priority Date: 02/09/1973
  • Status: Expired due to Term
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First Claim
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1. A temperature-sensitive control switch comprising:

  • a current-controlled switching means;

    a temperature sensing unit;

    a first number of semiconductor rectifiers included in said temperature sensing unit and connected in a first serial combination;

    a second number of semiconductor rectifiers included in said temperature sensing unit and connected in a second serial combination, said second number being greater than said first number;

    a primary current supply connected to a parallel connection of said first and said second serial combinations and arranged for forward-biasing said semiconductor rectifiers in said first and said second serial combinations;

    means for applying the potential developed across said first serial combination in response to the portion of said primary current therethrough to said second serial combination; and

    a transistor included in said temperature sensing unit having a base-emitter junction which is included within said second number of semiconductor rectifiers and having a collector electrode connected to said current-controlled switching means to supply it control current.

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