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External magnetic interference resisting method and magnetic sensor chip utilizing same

A magnetic sensing and magnetic interference technology, applied in special recording/indicating devices, measuring devices, instruments, etc., can solve the problems of inconvenient use, poor anti-interference performance of sensors, etc., to reduce size and improve anti-electromagnetic interference effect of effect

Inactive Publication Date: 2014-10-15
ZHEJIANG JUZI INTELLIGENT TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantages of poor anti-interference performance and inconvenient use of sensors realized by means of electromagnetic shielding, the present invention proposes a method for anti-external magnetic interference and a magnetic sensor chip using the method. Differential structure realizes anti-electromagnetic interference

Method used

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  • External magnetic interference resisting method and magnetic sensor chip utilizing same
  • External magnetic interference resisting method and magnetic sensor chip utilizing same
  • External magnetic interference resisting method and magnetic sensor chip utilizing same

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Embodiment Construction

[0028] The anti-external magnetic interference magnetic sensor chip 1 in this embodiment realizes the anti-interference electromagnetic interference when the external interference wire 3 is energized through the differential output of each internal magnetic sensing unit, and realizes accurate measurement of the detection current collected by the detection wire 2 Signal.

[0029] see figure 2 , each magnetic sensing unit and detection wire 2 are located in the yoz plane, and the interference wire 3 is outside the chip 1 in any direction.

[0030] An interfering magnetic field will be generated around the interfering wire 3, and the magnetic field will interfere with each magnetic sensing unit of the sensor. see figure 2 , for the above-mentioned magnetic sensing unit located in the yoz plane, only the current intensity vector of the disturbing current of the disturbing wire 3 i Projected components in the yoz plane i yz Only the generated disturbance magnetic field can i...

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Abstract

Disclosed is an external magnetic interference resisting method. The method comprises that the inside of a magnetic sensor chip is set to be composed of four magnetic sensing units and a detecting wire wherein the four magnetic sensing units are arranged in a rectangular array, and the detecting wire is parallel to the plane where the four magnetic sensing units are arranged and is spaced from the four magnetic sensing units at the same distance; the magnetic sensing units detect the signals of the detecting wire; meanwhile, the output of external magnetic interference at the magnetic sensing units is suppressed after passing through a differential amplification unit. The invention also relates to a magnetic sensor chip utilizing the external magnetic interference resisting method. The external magnetic interference resisting method has the advantages of, by means of the differential structure among the four magnetic sensing units integrated inside the chip, improving the anti-electromagnetic interference capacity of sensors and reducing the sizes of the sensors compared with traditional electromagnetic shielding methods.

Description

technical field [0001] The invention relates to a method for resisting external magnetic interference and a magnetic sensor chip using the method. Background technique [0002] Electromagnetic sensors have a wide range of applications, but there are often unavoidable electromagnetic interferences in the sensor application environment, such as the surrounding wires or various interference electromagnetic fields generated by the use of communication equipment, which seriously affect the measurement accuracy of the magnetic sensor. The currently known anti-electromagnetic interference method is electromagnetic shielding, that is, using a metal shielding shell to isolate the sensor from the interfering electromagnetic field to achieve anti-electromagnetic interference. However, electromagnetic shielding inevitably has electromagnetic leakage, which affects the shielding effect, and due to the existence of the metal shielding body, the entire system is bulky and inconvenient to u...

Claims

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Application Information

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IPC IPC(8): G01D3/032
Inventor 陈全钟政楼永伟汪飞高彬李武华陈潼茅晓捷王浩军陈荧谢明
Owner ZHEJIANG JUZI INTELLIGENT TECH
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