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Voltage generating circuit and overcurrent detecting circuit

  • US 10,281,941 B2
  • Filed: 12/04/2017
  • Issued: 05/07/2019
  • Est. Priority Date: 12/07/2015
  • Status: Active Grant
First Claim
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1. A voltage generating circuit that generates a comparison reference voltage having temperature characteristics proportional to output temperature characteristics of a current detecting element, the voltage generating circuit comprising:

  • a first resistance voltage dividing circuit, configured by at least two low temperature coefficient (LTC) resistors connected in series, the at least two LTC resistors have resistance temperature coefficients equal to or about zero, the first resistance voltage dividing circuit generates a reference voltage by resistance-dividing a power supply voltage;

    at least two second resistance voltage dividing circuits, each of the second resistance voltage dividing circuits of the at least two second resistance voltage dividing circuits being configured by a resistor having a positive or negative resistance temperature coefficient and a third LTC resistor connected in series, each of the second resistance voltage dividing circuits of the at least two second resistance voltage dividing circuits generating a temperature-dependent divided voltage by resistance-dividing the power supply voltage;

    a comparator to compare the temperature-dependent divided voltage of a first of the at least two second resistance voltage dividing circuits to the reference voltage and to select as an output,the temperature-dependent divided voltage of the first of the at least two second resistance voltage diving circuits, when the temperature-dependent divided voltage of the first of the at least two second resistance voltage dividing circuits is less than the reference voltage, andthe temperature-dependent divided voltage of a second of the at least two second resistance voltage dividing circuits, when the temperature-dependent divided voltage of the first of the at least two second resistance voltage dividing circuits is greater than the reference voltage; and

    an instrumentation amplifier that generates the comparison reference voltage based on a difference between the reference voltage and the output selected by the comparator.

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