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Quasi-power measurement circuit

  • US 4,837,653 A
  • Filed: 06/26/1987
  • Issued: 06/06/1989
  • Est. Priority Date: 06/26/1987
  • Status: Expired due to Term
First Claim
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1. A signaling circuit adapted to be connected to an electrical component to signal when the electrical component is consuming excessive power, the maximum allowable current through and voltage across the component being Imax and Vmax, respectively, the signaling circuit comprising:

  • means for measuring the current through the electrical component;

    means for measuring the voltage across the electrical component;

    means for producing a comparison voltage that represents the sum of the values of I and V, I and V respectively being the normalized current through and voltage across the electrical component, the normalization factors being Imax and Vmax, respectively, the comparison voltage being an approximation to the power consumed by the electrical component; and

    means for comparing the comparison voltage to a threshold voltage and producing an overpower signal when the comparison voltage exceeds the threshold voltage.

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