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Current sensor

  • US 10,247,758 B2
  • Filed: 08/08/2016
  • Issued: 04/02/2019
  • Est. Priority Date: 08/08/2016
  • Status: Active Grant
First Claim
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1. A current sensor, comprising:

  • a ferromagnetic core having a substantially central opening for receiving a current conductor and at least two gaps portions, each of the gap portions having an associated gap spacing; and

    a detector comprising at least one first magnetic field sensing element disposed in a first one of the gap portions and configured to generate a respective first magnetic field signal in response to a first magnetic field generated in the first gap portion in response to a current through the current conductor, and at least one second magnetic field sensing element disposed in a second one of the gap portions and configured to generate a respective second magnetic field signal in response to a second magnetic field generated in the second gap portion in response to the current through the conductor, wherein the first magnetic field has a magnitude greater than the second magnetic field, wherein the detector further comprises a first circuit portion responsive to the first magnetic field signal and a second, substantially identical circuit portion responsive to the second magnetic field signal, and wherein a sensitivity of the first circuit portion is calibrated based on the spacing of the first gap portion and a sensitivity of the second circuit portion is calibrated based on the spacing of the second gap portion to be lower than the sensitivity of the first circuit portion.

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