Design and Experimental Study of a Current Transformer with a Stacked PCB Based on B-Dot

Wang, Jingang; Si, Diancheng; Tian, Tian; Ren, Ruiming

doi:10.3390/s17040820

Cited by 14 publications

(9 citation statements)

References 23 publications

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“…Contactless current measurement devices are based on detection of the magnetic field created by the current. When only the AC current component is measured, the most used devices are based on current transformers and Rogowski coils [1][2][3]. However, to measure DC/AC currents, sensors able to detect DC magnetic fields with high accuracy must be used.…”

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

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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%

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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“…Shielding improves their bandwidth and reduces parasitic capacitive coupling [70]. The B-Dot sensor works on the same principle as a Rogowski coil, using flat coils made of multilayer PCB [71].…”

Section: Current Transformers Rogowski Coils and Fluxgate Current Sementioning

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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“…Rogowski coils and similar devices are coreless, but they can measure only the AC currents [5]. First approach for measuring the DC/AC current are the transducers without yoke.…”

Section: Introductionmentioning

confidence: 99%

Rectangular Array Electric Current Transducer with Integrated Fluxgate Sensors

Ripka

Mlejnek

Hejda

et al. 2019

Sensors

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Novel rectangular yokeless current transducer with the range 400 A using 16 microfluxgate sensors around the busbar conductor is presented in this paper. Compared to yokeless transducers utilizing the differential pair of magnetic sensors, our solution has much better suppression of the external currents (lower crosstalk). Compared to industrial transducers with yoke, the new transducer has 15-times lower noise, 7-times better temperature stability, and same crosstalk. Sensor design and design of current monitoring system is presented together with the results of long-term field tests. Crosstalk error is examined in dependence on the number of the operating sensors and external current position.

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Design and Experimental Study of a Current Transformer with a Stacked PCB Based on B-Dot

Cited by 14 publications

References 23 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

Rectangular Array Electric Current Transducer with Integrated Fluxgate Sensors

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