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A Contactless Current Sensor Based on TMR Chips
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DOI：10.1109/TIM.2022.3191663.png)
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Abstract
En 中文
Inexpensive, nonintrusive, and easy-installation current sensors are of great help in the economical and reliable operation of power systems. In this article, a novel contactless current sensor with small size, ultramicro power consumption, and self-power capability is proposed based on tunnel magnetoresistance (TMR). For measuring arbitrary line currents under an interference magnetic field, the single-axis TMR chips array and anti-interference method are introduced. Then, the designs of software and hardware are given for ultralow-power consumption and self-power. The experimental results showed that the measuring range of the current sensor is from 0 to 1500 A, and the error is less than 0.6% when the measured current is over 150 A.
Keywords:
Current measurement
Magnetic tunneling
Magnetic fields
Semiconductor device measurement
Magnetic field measurement
Saturation magnetization
Wires
Contactless current sensor
self-powered
tunnel magnetoresistance (TMR) chip
ultramicro power consumption
Journal
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5.9
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1.9W
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5.8W