Giant magnetoresistance effect current sensor

A current sensor, giant magnetoresistance technology, applied in the measurement of current/voltage, instrument, measurement of electrical variables, etc., can solve the problem of being easily affected by external stray magnetic fields, and achieve high square ratio, high common mode rejection ratio, The effect of low coercivity

Active Publication Date: 2014-02-12
HEBEI UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a giant magnetoresistance effect current sensor, which is a giant magnetoresistance effect current sensor with a magnetic shielding shell and a bias coil. The highly sensitive cha

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Embodiment

[0049] with the above figure 1 , image 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The various parts of the shown embodiment are arranged as a current sensor based on the giant magnetoresistance effect with a magnetic shielding shell and a bias coil, wherein the structural shape of the magnetic shielding shell 1 and the shape and location of the bias coil winding 2 are all in the figure 1 Expressed in. The giant magnetoresistive chip 3 is the GMR chip, which uses AA002-02 produced by NVE Company in the United States; the U-shaped magnetic shielding shell is made of Permalloy material, with a resistivity of 0.56μΩ·m and a Curie point of 400°C , the saturation magnetic induction is Bs=0.7T, the coercive force Hc under the saturation magnetic induction is not more than 1.6A / m, the DC magnetic performance meets the magnetic permeability in the 0.08A / m magnetic field strength is not less than 37.5mH / m, the thickness It is 1mm, the width is 7mm, the heigh...

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Abstract

The invention relates to devices for measuring currents, in particular to a giant magnetoresistance effect current sensor with a magnetic shielding shell and a bias coil. The giant magnetoresistance effect current sensor comprises the U-shaped magnetic shielding shell, a giant magnetoresistance chip, a bias coil winding, a current-carrying conductor, a PCB, a bias current source and a signal processing circuit, wherein the probe of the giant magnetoresistance effect current sensor is formed by the U-shaped magnetic shielding shell, the giant magnetoresistance chip, the bias coil winding, the current-carrying conductor and the PCB, the signal processing circuit comprises a bias magnetic field generating circuit, a giant magnetoresistance chip supply voltage switching circuit, a reference voltage generating circuit and an improved difference operational amplification circuit, the magnetic shielding shell overcomes the defect that magnetic fields are prone to being simultaneously influenced by an outside stray magnetic field due to the high sensitivity of giant magnetoresistance on the magnetic fields, and meanwhile hysteresis errors are reduced and alternate and direct currents are precisely measured through the method of providing the bias coil winding for a bias magnetic field.

Description

technical field [0001] The technical solution of the invention relates to a device for measuring current, specifically a giant magnetoresistance effect current sensor. Background technique [0002] With the development of power electronics technology, the demand for high-performance compact current sensors is gradually increasing. Traditional current detection methods include shunts, current transformers, Rogowski coils, and Hall sensors; new current detection technologies include fluxgate sensors, giant magnetoresistance effect current sensors, and fiber optic sensors. In contrast, the giant magnetoresistance effect current sensor has its own outstanding advantages and unique magnetic induction ability. The giant magnetoresistance effect current sensor has the characteristics of high sensitivity to applied magnetic field, high operating bandwidth range, excellent temperature stability, low power consumption and miniaturization. [0003] However, due to the high sensitivit...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 杨晓光解存福李元园
Owner HEBEI UNIV OF TECH
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