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Circuit for sensing motor load current

  • US 5,900,714 A
  • Filed: 11/04/1997
  • Issued: 05/04/1999
  • Est. Priority Date: 11/08/1996
  • Status: Expired due to Term
First Claim
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1. A current sensing circuit, comprising:

  • a resistive shunt adapted to be coupled, at its one end, to the junction of a half bridge, high-side, low-side transistor pair and, at its other end, to a load such that a sensed voltage across the shunt is proportional to the current delivered to the load; and

    a level shifting circuit adapted to transpose the sensed voltage to a lower potential referenced to ground, such that a feedback voltage is produced from the sensed voltage which may be used to control commutation of the half bridge transistors.

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