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Electronic thermostat control unit and its use in multipoint temperature controller for refrigeration and heating systems

  • US 6,006,996 A
  • Filed: 05/12/1998
  • Issued: 12/28/1999
  • Est. Priority Date: 10/16/1997
  • Status: Expired due to Term
First Claim
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1. An electronic digital thermostat control unit comprising:

  • a p-n junction temperature sensing element;

    a constant current source to drive the said p-n junction sensing element;

    an analog-to-digital converter coupled to the output of the said p-n junction element to produce a digital output;

    a non-volatile memory storing calibration dataa correcting circuit coupled to the analog-to-digital converter for correcting the digital output for sensitivity and offset values of the sensing element using the calibration data stored in the non-volatile memory and generating a corrected output;

    at least one digital comparator having first and second inputs, the first input coupled to the corrected output from the correcting circuit and the second input coupled to a digital reference value, the digital comparator generating an output when the corrected output matches the digital reference value;

    a control latch having an input that is to set and/or reset in response to the output of digital comparator for actuating a load comprising a temperature correction device in a consumer/industrial product.

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