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Current sensing circuit

  • US 4,713,607 A
  • Filed: 12/23/1985
  • Issued: 12/15/1987
  • Est. Priority Date: 12/23/1985
  • Status: Expired due to Term
First Claim
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1. A current sensing circuit for sensing current level and signaling if such current exceeds a predetermined detection level, comprising:

  • a current path of a predetermined resistance between a first voltage sense point and a second voltage sense point;

    reference voltage means having an input coupled to one of the voltage sense points for sensing the voltage and shifting it a predetermined amount equal to the voltage produced across the predetermined resistance when the current through the predetermined resistance reaches the detection level; and

    comparator means coupled to the reference voltage means and to the other voltage sense point for sensing and comparing the other sensed voltage with the shifted sensed voltage, the comparator means indicating that the current being sensed is below the predetermined detection level when the other sensed voltage exceeds the shifted sensed voltage and indicating that the current being sensed exceeds the predetermined level when the other sensed voltage is less than the shifted sensed voltage.

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