Fabrication and Performance of Integrated Fluxgate for Current Sensing Applications

Lee, Dok Won; Eissa, Mona; Gabrys, A.; Shulver, B.J.R.; Mazotti, Erika; Lavangkul, S.; Chevacharoenkul, S.; Murphy, Neal; Wang, Fuchao; Zhang, Yousong; French, W.; Jenson, M.L.; Jackson, Ricky

doi:10.1109/tmag.2017.2713244

Cited by 20 publications

(7 citation statements)

References 7 publications

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“…Low-Cost Self-Oscillating Fluxgate Transducers have also been used to measure high currents [29]. The first microfluxgate sensor on the market was developed by Texas Instruments for current sensing applications [30]. Microfluxgate sensors use pulse excitation to reduce power consumption [31].…”

Section: Fluxgate Sensorsmentioning

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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Section: Fluxgate Sensorsmentioning

confidence: 99%

Contactless measurement of electric current using magnetic sensors

Ripka

2019

Tm - Technisches Messen

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“…This was possible only because the used sensor has low crossfield error [10]. We have used integrated fluxgates DRV425 manufactured by Texas Instruments [11]- [13]. The sensors were fixed in the plastic holders manufactured by 3-D printing.…”

Section: Measurementsmentioning

confidence: 99%

Contactless Piston Position Transducer With Axial Excitation

2017

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Existing piston position transducers require either drilling precise hole into the piston bar, or mounting permanent magnets or measuring device inside the pressurized cylinder. We present a new solution for aluminum pneumatic cylinders, which uses the ferromagnetic bar inside the solenoid as a marker and linear array of fluxgate sensors as a scale. Instead of relying on dc remanence we use active ac excitation; the reading is resistant against external fields, both dc and ac. Using sensor array allows to compensate for temperature effects. The linear stroke of the individual sensor is 40 mm, so that array density should be about 30 mm. 1 mm position resolution is achievable. The weak point of the new transducer is the response time: for fast moving pistons the excitation frequency should be high, which leads to weaker signal and lower resolution.

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“…Recently introduced integrated fluxgate sensors (DRV425 by Texas Instruments) have excellent offset stability and linearity, 2 mT range, but higher noise than AMR sensors, which have a lower range of typically 200 T [14,15]. In conclusion, Hall sensors are the best solution for kA currents; integrated fluxgate sensors are suitable for the current range of 100 A and AMR sensors can be used for 10 A range with A resolution.…”

Section: Introductionmentioning

confidence: 98%

Off-Center Error Correction of AMR Yokeless Current Transducer

Mlejnek

Ripka

2017

Journal of Sensors

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We present a method of calibration and error correction of the AMR yokeless current transducer consisting of a circular array of eight anisotropic magnetoresistors (AMR) with one feedback compensation loop. The main sources of errors are the nonidentical parameters of AMR sensors and off-center position of the measured current. It is well known that AMR sensors from the same batch have 2% spread of the sensitivity; we found that the variation of the factor of the internal compensation coil is the same. We developed a novel calibration process using the readings of individual residual uncompensated voltages of the AMRs. The position of the current inside the measurement hole is estimated from the individual voltages considering the influence of external DC magnetic field such as the Earth's field. During the calibration phase, the sensor outputs are measured for several positions of the current conductor inside the measuring hole. As a result of calibration the lookup table of error corrections is calculated and stored in the memory, and then these values are used for the correction during the measurement of the unknown current. This procedure reduces the off-center error from 0.4% to 0.06%.

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Fabrication and Performance of Integrated Fluxgate for Current Sensing Applications

Cited by 20 publications

References 7 publications

Contactless measurement of electric current using magnetic sensors

Contactless measurement of electric current using magnetic sensors

Contactless Piston Position Transducer With Axial Excitation

Off-Center Error Correction of AMR Yokeless Current Transducer

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