New Small-Volume High-Precision TMR Busbar DC Current Sensor

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

doi:10.1109/tmag.2019.2953671

Cited by 25 publications

(6 citation statements)

References 18 publications

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“…The linearity, repeatability, and accuracy were calculated to be 0.027%, 0.064%, and 0.091%, respectively. Our current sensor demonstrates superior performance in terms of linearity, resolution, and sensitivity when compared to previously reported similar works [19,20].…”

Section: Results and Analysismentioning

confidence: 55%

Dual-range TMR current sensor based on magnetic shunt/aggregation effects utilizing single magnetic ring structure

Bai,

Li,

et al. 2024

Meas. Sci. Technol.

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In this paper, we propose and design a novel dual-range Tunnel Magnetoresistance (TMR) current sensor with a single magnetic ring structure. This design incorporates two distinct magnetic guiding effects, namely magnetic shunt and magnetic aggregation, within the same magnetic ring. By integrating a high-sensitivity TMR sensor chip with a closed-loop feedback circuit, we achieve a TMR current sensor with excellent linearity, high resolution, as well as high frequency response. The magnetic ring structure is first modeled and simulated, establishing a correlation between the distribution of magnetic induction intensity and the parameters of the magnetic ring and feedback coils. Through simulation optimization and theoretical calculations, we determine the optimal positions for TMR sensor chips in the magnetic ring, suitable for both current ranges. When a signal current is present, the TMR sensor chip generates a weak differential voltage signal, which is subsequently amplified, processed, and automatically transmitted to the laptop via a serial port. Furthermore, the sensor allows for automatic switching between the two current ranges. The results demonstrate that our designed dual-range current sensor exhibits outstanding performance characteristics, including a high resolution of 500 μA in the small range, accuracy of 0.10%, excellent linearity of 0.011%, and a fast frequency response of 500 kHz. These features make it highly applicable in various fields such as new energy vehicles and smart grids, indicating promising prospects for its widespread utilization.

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Section: Results and Analysismentioning

confidence: 55%

Dual-range TMR current sensor based on magnetic shunt/aggregation effects utilizing single magnetic ring structure

Bai,

Li,

et al. 2024

Meas. Sci. Technol.

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show abstract

“…In recent years, the tunneling magnetoresistance (TMR) sensor has been extensively researched as an innovative current measurement technique due to its significant advantages such as high sensitivity, wide bandwidth, and good linearity [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Wang et al proposed a current sensor based on TMR technology, which consists of two TMR sensors to form a differential structure, while offline calibration is required to obtain the proportional coefficients between the measured magnetic fields and the currents [ 12 ].…”

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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“…To improve the sensitivity, sensors that use a Hall element as the sensitive element need to adopt a polymagnetic ring structure, which increases the volume and weight of the sensor. Although AMR elements have a higher sensitivity than Hall elements, their linear range is narrower [35]. Meanwhile, sensors using AMR elements as sensing elements need to set up an additional set/reset coil structure to achieve the relevant settings, which increases the complexity of the manufacturing process and power consumption [32].…”

Section: Introductionmentioning

confidence: 99%

Angular displacement sensor for gear position detection based on the tunneling magnetoresistance effect

Wang¹,

Qin²,

Chen³

et al. 2022

Meas. Sci. Technol.

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In the fields of robotics, machine tools, and spacecraft, the measurement of the gear angular position lay the foundation for the closed-loop position feedback. In this article, an angular displacement sensor based on tunneling magneto-resistance effect is proposed for the precise angle displacement measurement. The developed sensor mainly consists of a tunneling magneto-resistance element, a signal conditioning circuit, a permanent magnet, and some necessary assembly components. The tunneling magnetoresistance element is composed of eight MTJs, which are arranged according to the dual-full bridge structure with the spatial electric angle difference of π/2. The signals containing time information and space information are obtained after the sinusoidal and cosine voltages signals are respectively connected in two Bridges. The signal is processed by a signal conditioning circuit, and then the angular displacement is measured via counting the clock pulses. The structure, working principles and signal conditioning method of the sensor are presented in detail. Moreover, a sensor prototype and a conditioning circuit are designed for the actual experiment, according to the measured gear with modulus of 1 and tooth number of 240. The prototype sensor has a theoretical resolution of 0.00001°. The experimental results show that the prototype sensor has a working stability of ±0.00023° within one hour, and its measurement accuracy is -0.0008611° to 0.001361° in the measurement range from 0° to 360°. Therefore, the proposed sensor can be well applied to the highly precise measurement of angular displacement.

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New Small-Volume High-Precision TMR Busbar DC Current Sensor

Cited by 25 publications

References 18 publications

Dual-range TMR current sensor based on magnetic shunt/aggregation effects utilizing single magnetic ring structure

Dual-range TMR current sensor based on magnetic shunt/aggregation effects utilizing single magnetic ring structure

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

Angular displacement sensor for gear position detection based on the tunneling magnetoresistance effect

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