TMR Busbar Current Sensor With Good Frequency Characteristics

Xu, X. P.; Wang, S.; Liu, T. Z.; Zhu, Min; Wang, J. G.

doi:10.1109/tim.2021.3089775

Cited by 16 publications

(4 citation statements)

References 17 publications

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“…Magnetoresistive sensors can be divided into anisotropic magnetoresistive (AMR) sensors, giant magnetoresistive (GMR) sensors, tunneling magnetoresistive (TMR) sensors. Nowadays, MR sensors have been broadly applied in various fields including circuit sensing [1][2][3], position sensing [4][5][6], biomedical applications [7][8][9][10], and non-destructive testing with high sensitivity and reliable performance is of great significance for industrial applications in the automotive sensing field.…”

Section: Introductionmentioning

confidence: 99%

A high-sensitive anisotropic magnetoresistive sensor based on hybrid Ta/NiFe/Ta/Al multilayer structure

Zhuo,

Liu,

Feng

et al. 2024

Meas. Sci. Technol.

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High sensitivity is crucial for anisotropic magnetoresistive (AMR) sensors in industrial applications. In this paper, a high- sensitive AMR sensor based on magnetoresistive thin films with Ta/NiFe/Ta/Al four-layer structure is proposed and fabricated. Firstly, the structural parameters were optimized by finite element analysis. Secondly, thin film samples and AMR sensors were prepared. Through the analysis and characterization of reluctance change rate, hysteresis loop, X-ray diffraction and surface morphology and structure, the process parameters were optimized. Finally, the sensor was connected to the designed external circuit, and its technical parameters were tested in a magnetic field test system. The results show that the prepared AMR sensor performs well. It has a high sensitivity of 1.27 mV/V/Oe, a low bridge offset voltage of ±1.64 mV/V, and a low temperature coefficient of sensitivity of -0.102 %/℃. The results contribute to the future development of AMR magnetic field sensor chips.

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Section: Introductionmentioning

confidence: 99%

A high-sensitive anisotropic magnetoresistive sensor based on hybrid Ta/NiFe/Ta/Al multilayer structure

Zhuo,

Liu,

Feng

et al. 2024

Meas. Sci. Technol.

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“…Xu et al used two TMR sensors to form a differential structure and fit them on the rectangular busbar to achieve current measurement over a wide temperature range [ 14 ]. Furthermore, Xu et al also used four TMR sensors placed at different locations near a rectangular busbar, and then realized the measurement of the rectangular busbar current [ 15 ]. In all the aforementioned methods, offline calibration is required to determine the linear relationship between the current in the conductor and the measured magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Non-Contact Current Measurement for Three-Phase Rectangular Busbars Using TMR Sensors

Su,

Li,

Liang

et al. 2024

Sensors

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This paper proposes a non-contact current measurement method for three-phase rectangular busbars based on TMR (tunneling magneto-resistance) sensors, due to their advantages of large dynamic range, wide bandwidth, light weight, and easy installation. A non-contact current sensor composed of only three TMR sensors is developed and the TMR sensors are respectively placed at a location with a certain distance from the surface of each rectangular busbar to measure the magnetic fields generated by the busbar currents. To calibrate the developed current sensor, i.e., to establish the relationship between the magnetic fields measured by the TMR sensors and the currents flowing in the three-phase rectangular busbars, we designed a thyristor-controlled resistive load as a calibrator, which is connected to a downstream branch of the distribution cabinet. By switching the resistive load, a calibration current, which can be identified from the background current, is generated in one rectangular busbar and its value is measured at the location of the calibrator, and transmitted wirelessly to the location of the TMR sensors. A new and robust method is proposed to extract the voltage components, corresponding to the calibration current, from the voltage waveforms of the TMR sensors. By calculating the proportional coefficients between the calibration currents and the extracted voltage components, online calibration of the current sensor is achieved. We designed and implemented a current measurement system consisting of a current sensor using TMR sensors, a thyristor-controlled resistive load for current sensor calibration, and a data acquisition circuit based on a multi-channel analog-to-digital converter (ADC). Current measurement experiments were performed in a practical distribution cabinet installed in our laboratory. Compared to the measurement results using a commercial current probe with an accuracy of 1%, the relative error of the measured currents in RMS is less than 2.5% and the phase error is less than 1°, while the nonlinearity error of the current sensor is better than 0.8%.

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“…The new magnetoresistive sensors, represented by TMR sensors, boast significant advantages in measuring small current signals In comparison to traditional current detection devices, they offer superior measurement accuracy and lower power consumption. However, the current use of such sensors for measurement is susceptible to interference from external stray magnetic fields [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Research on Residual-Current Measurement System of Substation Considering Magnetic Shielding Effect

Tian,

Xu,

Yang

et al. 2024

Sensors

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Residual current is an important monitoring quantity of a power system, and a current sensor plays an important role in detecting current. The substation environment is complex. In addition to the power frequency signal, residual current also has AC and DC components. But it is also affected by the stray magnetic field of the substation. Therefore, the accuracy of the current sensor demands higher requirements. The tunnel magnetoresistive sensor has the advantages of a stable operation, high efficiency, and energy saving, but it is easily affected by the external stray magnetic field during measurements, resulting in a large error. Therefore, this paper proposes a residual-current sensing monitoring system considering the magnetic shielding effect. The root mean square error of the magnetic shielding structure is only 0.572 mA, which can effectively reduce the influence of the external magnetic field and improve the detection accuracy. At the same time, the DC measurement error is less than 1%, the AC measurement error is less than 5%, and the hybrid AC/DC error is less than 8%. It has good response ability and can accurately detect residual current.

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TMR Busbar Current Sensor With Good Frequency Characteristics

Cited by 16 publications

References 17 publications

A high-sensitive anisotropic magnetoresistive sensor based on hybrid Ta/NiFe/Ta/Al multilayer structure

A high-sensitive anisotropic magnetoresistive sensor based on hybrid Ta/NiFe/Ta/Al multilayer structure

Non-Contact Current Measurement for Three-Phase Rectangular Busbars Using TMR Sensors

Research on Residual-Current Measurement System of Substation Considering Magnetic Shielding Effect

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