Current sensor and measuring apparatus
First Claim
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.
1 Assignment
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Accused Products
Abstract
A current sensor includes: a magnetic core that surrounds a detected object; a first sensor with a first sub-magnetic core incorporated in the magnetic core and a first winding wound around the first sub-magnetic core; a second sensor with a second sub-magnetic core incorporated in the magnetic core and a second winding wound around the second sub-magnetic core in the opposite direction to the first winding; a signal generator outputting signals to magnetize the first and second windings with inverted phases; a detector outputting a detection signal whose amplitude is proportionate to a current in the detected object based on the difference between first and second voltage signals generated in the first and second windings; and a waveform adjuster that is connected to at least one of the first and the second windings and adjusts the waveform of a voltage signal generated by the connected winding.
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Citations
8 Claims
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1. A current sensor comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification