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TMR current sensor and current detection method

A current sensor and current technology, applied in the direction of measuring current/voltage, instruments, measuring devices, etc., can solve the problems of increasing sensor size and cost, and achieve the effect of simple and convenient signal-to-noise ratio adjustment, volume reduction, and cost reduction

Inactive Publication Date: 2014-05-21
JIANGSU SENTRONIC ELECTRONICS TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to achieve the desired results by using the above methods to improve the signal-to-noise ratio, the size and cost of the sensor must be greatly increased.

Method used

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Embodiment Construction

[0036] Such as figure 1 As shown, it is a schematic structural diagram of a TMR current sensor in an embodiment of the present invention; a TMR current sensor in an embodiment of the present invention includes: a measured current wire 3, a first TMR sensitive element 1, a second TMR sensitive element 2, and a differential amplifier circuit ( not shown).

[0037] The measured current conductor 3 is a straight line structure, and the current direction is shown by arrow I.

[0038] The first TMR sensitive element 1 is arranged at a position close to the measured current wire 3, and the sensing direction 1a of the first TMR sensitive element 1 is perpendicular to the current direction of the measured current wire 3, and the first A TMR sensitive element 1 is used to induce the magnetic field generated by the current of the measured current wire 3 and generate a first output voltage.

[0039] The second TMR sensitive element 2 is arranged at a position away from the measured curr...

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Abstract

The invention discloses a TMR (Tunnel Magneto-Resistance) current sensor which comprises a measured current conductor, two TMR sensing elements and a differential amplifier circuit. The two TMR sensing elements are the same in sensing direction; in the presence of an external disturbing magnetic field, the two TMR sensing elements generate in-phase signals, and the output voltage signals of the two TMR sensing elements are subjected to differential treatment so that the two in-phase external disturbing signals can be counteracted, and therefore, the external disturbing magnetic field is shield. The invention also discloses a current detection method for the TMR current sensor. The TMR current sensor is capable of shielding the interference of a large magnetic field with small volume, and as a result, the volume and cost of the sensor can be reduced; the TMR current sensor is capable of realizing the adjustment of a signal-to-noise ratio by regulating the sensitivity of the TMR sensing elements or the distance between the TMR sensing elements, and further simple and convenient in signal-to-noise ratio adjustment, more obvious in action and higher in efficiency.

Description

technical field [0001] The invention relates to a current sensor, in particular to a tunnel magnetoresistance effect (TMR) current sensor, and also relates to a current detection method using the TMR current sensor. Background technique [0002] TMR technology is the latest magnetic sensing technology, and its sensitivity is much higher than Hall effect (Hall effect) and other technologies. The TMR effect refers to the resistance between the first ferromagnetic metal and the second ferromagnetic metal and the first ferromagnetic metal and the The magnetization orientation between the second ferromagnetic metal is related. When the magnetization orientation between the first ferromagnetic metal and the second ferromagnetic metal is arranged in parallel, the resistance from the first ferromagnetic metal to the second ferromagnetic metal is relatively small. Low; when the magnetization orientations between the first ferromagnetic metal and the second ferromagnetic metal are al...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 郑律赵伟军陈雁卢友林
Owner JIANGSU SENTRONIC ELECTRONICS TECH INC