Integrated Fluxgate Magnetometer for Use in Isolated Current Sensing

Snoeij, M.F.; Schaffer, Viola; Udayashankar, Sudarshan; Ivanov, Mikhail

doi:10.1109/jssc.2016.2554147

Cited by 69 publications

(33 citation statements)

References 9 publications

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“…The (micro)fluxgate [4,5] sensors offer high performance and stability in detection of DC/AC currents. A Fluxgate current sensor uses a high permeability magnetic core to detect magnetic fields produced by a current flow.…”

Section: Introductionmentioning

confidence: 99%

“…The electronics used to drive the currents, to demodulate the signal and to manage all the sensor's functionality is quite complex and often power consuming. Now, new reported developments are ongoing, in which the fluxgate magnetometer is co-integrated along with circuitry on a die [5]. Fluxgate sensors are much more sensitive than Hall sensors and have better temperature stability, and low noise and linearity.…”

Section: Introductionmentioning

confidence: 99%

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High Sensitivity Differential Giant Magnetoresistance (GMR) Based Sensor for Non-Contacting DC/AC Current Measurement

Musuroi

Oproiu

Volmer

et al. 2020

Sensors

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This paper presents the design and implementation of a high sensitivity giant magnetoresistance (GMR) based current sensor with a broad range of applications. The novelty of our approach consists in using a double differential measurement system, based on commercial GMR sensors, with an adjustable biasing system used to linearize the field response of the system. The work aims to act as a fully-operational proof of concept application, with an emphasis on the mode of operation and methods to improve the sensitivity and linearity of the measurement system. The implemented system has a broad current measurement range from as low as 75 mA in DC and 150 mA in AC up to 4 A by using a single setup. The sensor system is also very low power, consuming only 6.4 mW. Due to the way the sensors are polarized and positioned above the U-shaped conductive band through which the current to be measured is flowing, the differential setup offers a sensitivity of about between 0.0272 to 0.0307 V/A (signal from sensors with no amplifications), a high immunity to external magnetic fields, low hysteresis effects of 40 mA, and a temperature drift of the offset of about −2.59×10−4 A/°C. The system provides a high flexibility in designing applications where local fields with very low amplitudes must be detected. This setup can be redesigned for a wide range of applications, thus allowing further specific optimizations, which would provide an even greater accuracy and a significantly extended operation range.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Sensitivity Differential Giant Magnetoresistance (GMR) Based Sensor for Non-Contacting DC/AC Current Measurement

Musuroi

Oproiu

Volmer

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…The magnetic field in the vicinity of a large current is high: if we want to measure a 10 kA current with a microfluxgate sensor with 2 kA/m range, the sensor should be positioned at a minimum distance of 1000/(2*2000) = 0.8 m. For a precise AMR sensor with 200 A/m, the minimum distance is 8 m. This can be solved by using Hall sensors with a larger range, but with much worse accuracy and temperature dependence. An elegant solution is to insert a gradiometric sensor inside a hole drilled in the busbar [89], (Fig. 8).…”

Section: Sensors Inside the Busbarmentioning

confidence: 99%

Contactless measurement of electric current using magnetic sensors

Ripka

2019

Tm - Technisches Messen

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We review recent advances in magnetic sensors for DC/AC current transducers, especially novel AMR sensors and integrated fluxgates, and we make critical comparison of their properties. Most contactless electric current transducers use magnetic cores to concentrate the flux generated by the measured current and to shield the sensor against external magnetic fields. In order to achieve this, the magnetic core should be massive. We present coreless current transducers which are lightweight, linear and free of hysteresis and remanence. We also show how to suppress their weak point: crosstalk from external currents and magnetic fields.

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“…A dc/ac current sensor with a differential integrated fluxgate inside the busbar is described in [8]. An advantage of this solution is that the range can easily be adjusted by changing the distance of the sensor from the busbar center, where the sensitivity is zero.…”

Section: B Busbar Sensor With Magnetic Sensors In the Holementioning

confidence: 99%

A Busbar Current Sensor With Frequency Compensation

2017

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DC/AC yokeless galvanically insulated electric current sensors are required for applications, e.g., in automotive and aerospace engineering, where size, weight, and/or price are strictly limited. A busbar current sensor with differential fluxgate in the hole has 1000 A range and 10 mA resolution. Using an asymmetric shape, we achieved a frequency error below ±3% up to 1 kHz, while keeping high temperature stability and low sensitivity to mechanical misalignments. The 2.5 mA/°C maximum dc drift is four times better than when using an AMR sensor and 1000 times better than when using a Hall sensor. The sensor linearity error is below 0.1%.

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Integrated Fluxgate Magnetometer for Use in Isolated Current Sensing

Cited by 69 publications

References 9 publications

High Sensitivity Differential Giant Magnetoresistance (GMR) Based Sensor for Non-Contacting DC/AC Current Measurement

High Sensitivity Differential Giant Magnetoresistance (GMR) Based Sensor for Non-Contacting DC/AC Current Measurement

Contactless measurement of electric current using magnetic sensors

A Busbar Current Sensor With Frequency Compensation

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