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Current sensor and measuring apparatus

  • US 10,288,649 B2
  • Filed: 10/13/2016
  • Issued: 05/14/2019
  • Est. Priority Date: 10/26/2015
  • Status: Active Grant
First Claim
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1. A current sensor comprising:

  • a ring-shaped main magnetic core through which a detected object is inserted;

    a first fluxgate sensor element with a first sub-magnetic core, which is incorporated in the main magnetic core, and a first detection winding wound around the first sub-magnetic core;

    a second fluxgate sensor element with a second sub-magnetic core, which is incorporated in the main magnetic core, and a second detection winding wound around the second sub-magnetic core in an opposite direction to a winding direction of the first detection winding;

    a signal generator that outputs excitation signals to the first detection winding and the second detection winding to magnetize the first sub-magnetic core and the second sub-magnetic core with inverted phases;

    a detector that outputs a detection signal whose amplitude changes in proportion to a current value of a current flowing in the detected object based on a difference between a first voltage signal generated in the first and a second voltage signal generated in the second detection winding; and

    a first waveform adjuster that is connected to the first detection winding and adjusts a signal waveform of the first voltage signal,wherein the first waveform adjuster includes a series circuit with a resistance element and a capacitance element and is configured so that at least one of the resistance element and the capacitance element is a variable element.

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