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Current Sensor

  • US 6,734,661 B2
  • Filed: 04/01/2002
  • Issued: 05/11/2004
  • Est. Priority Date: 04/02/2001
  • Status: Expired due to Term
First Claim
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1. A current sensor comprising:

  • a number of conductor paths for carrying a number of currents to be sensed, and sensing means for coupling to a magnetic field pattern generated by the flow of current in said conductor paths;

    wherein said sensing means comprising a substantially planar arrangement of conductive elements, consisting of;

    a first coil comprising a first, inner, coil portion having an effective magnetic centre at a first location (C1), and a second, outer, coil portion having an effective magnetic centre at the first location (C1) wherein the first coil has a central region of positive response to time-increasing magnetic field perpendicular to the plane of the said coil, surrounded by a region of negative response to said magnetic field and wherein the region of positive response is centred at the first location (C1); and

    a second coil, in a plane substantially parallel to said first coil, comprising a third, inner, coil portion having an effective magnetic centre at a second location (C2), and a fourth, outer, coil portion having an effective magnetic centre at the second location (C2), wherein the second coil has a central region of negative response to said magnetic field surrounded by a region of positive response to said magnetic field and wherein the region of negative response is centred at the second location (C2);

    wherein the first coil and the second coil are located relative to each other so that, along the line joining C1 and C2, the region of positive response of the first coil to said magnetic field substantially coincides with the region of positive response of the second coil to said magnetic field and so that the region of negative response of the second coil to said magnetic field coincides with the region of negative response of the first coil to said magnetic field.

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