MAGNETIC-BALANCE-SYSTEM CURRENT SENSOR
First Claim
1. A magnetic-balance-system current sensor comprising:
- a magnetoresistive element, a resistance value of the magnetoresistive element being changed by application of an induction magnetic field generated by a measurement target current;
magnetic cores disposed in the vicinity of the magnetoresistive element;
a feedback coil disposed in the vicinity of the magnetoresistive element and configured to generate a cancelling magnetic field, the cancelling magnetic field being a field cancelling out the induction magnetic field; and
a magnetic-field detecting bridge circuit having two outputs having a voltage difference therebetween, the voltage difference being generated in accordance with the induction magnetic field,wherein the measurement target current is measured on the basis of a current flowing through the feedback coil when electricity is conducted through the feedback coil due to the voltage difference and the induction magnetic field and the cancelling magnetic field enter a state of equilibrium in which the induction magnetic field and the cancelling magnetic field cancel each other out,wherein the feedback coil, the magnetic cores, and the magnetic-field detecting bridge circuit are formed on a same substrate, andwherein the feedback coil is of a spiral type, and the magnetic cores are provided above and below the feedback coil.
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Accused Products
Abstract
A magnetic-balance-system current sensor includes: a magnetoresistive element, a resistance value of the magnetoresistive element being changed by applying an induction magnetic field generated by a measurement target current; magnetic cores disposed near the magnetoresistive element; a feedback coil disposed near the magnetoresistive element and configured to generate a cancelling magnetic field that cancels out the induction magnetic field; and a magnetic-field detecting bridge circuit having two outputs. The measurement target current is measured on the basis of a current flowing through the feedback coil when the induction magnetic field and the induction magnetic field and the cancelling magnetic field cancel each other out. The feedback coil, the magnetic cores, and the magnetic-field detecting bridge circuit are formed on a same substrate. The feedback coil is of a spiral type, and the magnetic cores are provided above and below the feedback coil.
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Citations
8 Claims
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1. A magnetic-balance-system current sensor comprising:
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a magnetoresistive element, a resistance value of the magnetoresistive element being changed by application of an induction magnetic field generated by a measurement target current; magnetic cores disposed in the vicinity of the magnetoresistive element; a feedback coil disposed in the vicinity of the magnetoresistive element and configured to generate a cancelling magnetic field, the cancelling magnetic field being a field cancelling out the induction magnetic field; and a magnetic-field detecting bridge circuit having two outputs having a voltage difference therebetween, the voltage difference being generated in accordance with the induction magnetic field, wherein the measurement target current is measured on the basis of a current flowing through the feedback coil when electricity is conducted through the feedback coil due to the voltage difference and the induction magnetic field and the cancelling magnetic field enter a state of equilibrium in which the induction magnetic field and the cancelling magnetic field cancel each other out, wherein the feedback coil, the magnetic cores, and the magnetic-field detecting bridge circuit are formed on a same substrate, and wherein the feedback coil is of a spiral type, and the magnetic cores are provided above and below the feedback coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification