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High accuracy differential current sensor for applications like ground fault interrupters

  • US 9,081,041 B2
  • Filed: 04/04/2012
  • Issued: 07/14/2015
  • Est. Priority Date: 04/04/2012
  • Status: Active Grant
First Claim
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1. A differential current sensor comprising:

  • a first current conduction path having a first input terminal and a first output terminal and a second current conduction path electrically isolated from the first current conduction path and having a second input terminal and a second output terminal;

    magnetic field sensing elements including a first sensing element to sense a magnetic field associated with a first current carried by the first current conduction path and a second sensing element to sense a magnetic field associated with a second current carried by the second current conduction path;

    circuitry, coupled to the magnetic field sensing elements, to provide an output signal; and

    wherein the output signal comprises a difference signal indicative of a difference between a magnitude of the first current and a magnitude of the second current.

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