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Magnetic sensing device and real-time self-inspection method thereof

A magnetic sensing and magnetic sensor technology, applied in the direction of measuring devices, measuring magnetic variables, instruments, etc., can solve problems such as inability to detect magnetic fields

Active Publication Date: 2017-10-31
ACEINNA TRANSDUCER SYST CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

Taking the AMR magnetic sensor device as an example, when the external magnetic field exceeds a certain range, the magnetic sensor device outputs a zero signal. At this time, it is impossible to judge whether the magnetic sensor is saturated through the output of the magnetic sensor device.
[0003] In addition, the magnetic field detection and self-test of the magnetic sensor device in the prior art are usually performed separately, which makes it impossible to perform magnetic field detection during the self-test

Method used

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  • Magnetic sensing device and real-time self-inspection method thereof
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  • Magnetic sensing device and real-time self-inspection method thereof

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Embodiment Construction

[0021] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] see figure 1 As shown, the first embodiment of the present invention based on the first solution discloses a real-time self-test method for a magnetic sensing device. The magnetic sensing device 100 includes a self-test coil 101 a , a magnetic sensor 103 and a signal processing circuit 104 . A high-frequency self-test current is applied to the self-test coil 101a to generate a high-frequency self-test magnetic field 101b; the external magnetic field 102a is a DC magnetic field 102b. The magnetic sensor 103 simultaneously detects the self-test magnetic field 101b and the external magnetic field 102b to obtain a magnetic field induction signal. The signal processing circuit 104 separates high and low frequency signals from the magnetic field induction signal, and obtains a high frequency self-test signal 105 and a DC external field sign...

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Abstract

The invention relates to a magnetic sensing device and a real-time self-inspection method thereof. The magnetic sensing device comprises a self-inspection coil, a magnetic sensor and a signal processing circuit, wherein the self-inspection coil is loaded with a high-frequency self-inspection current so as to generate a high-frequency self-inspection magnetic field; the magnetic sensor is used for simultaneously detecting the high-frequency self-inspection magnetic field and a low-frequency external magnetic field so as to obtain magnetic field sensing signals; and the signal processing circuit is used for separating to obtain high-frequency self-inspection signals and low-frequency external field signals from the magnetic field sensing signals. The magnetic sensing device can be used for judging whether the magnetic sensor is saturated based on the high-frequency self-inspection signals and correcting the sensitivity. According to the real-time self-inspection method disclosed by the invention, the self-inspection signals and external field signals of the magnetic sensor are obtained in real time, and the detection of the external field signals is not influenced by the self-inspection signals.

Description

technical field [0001] The invention relates to a self-inspection method of a magnetic sensor device, in particular to a magnetic sensor device and a real-time self-inspection method thereof. Background technique [0002] None of the existing solutions involves real-time self-testing of magnetic sensing devices in high-frequency applications. Especially the saturation detection and sensitivity calibration of sensors based on AMR, GMR, TMR and other technologies. Taking the AMR magnetic sensor device as an example, when the external magnetic field exceeds a certain range, the magnetic sensor device outputs a zero signal. At this time, it is impossible to judge whether the magnetic sensor is saturated through the output of the magnetic sensor device. [0003] In addition, the magnetic field detection and the self-test of the magnetic sensor device in the prior art are usually performed separately, which makes it impossible to perform the magnetic field detection during the se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/07G01R33/09G01R35/00
CPCG01R33/07G01R33/093G01R33/096G01R33/098G01R35/00G01R35/005
Inventor 蒋乐跃赵阳刘斌艾利克斯·瑞宾凯李大来
Owner ACEINNA TRANSDUCER SYST CO LTD
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