Realization and optimization of bus bar current transducers based on Hall effect sensors

Blagojević, Marija; Jovanović, Uglješa; Jovanović, Igor; Mancic, Dragan; Popović, R.S.

doi:10.1088/0957-0233/27/6/065102

Cited by 33 publications

(19 citation statements)

References 8 publications

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“…Calibration points should cover location close to the center of the hole and the positions where the offcenter error is the greatest, for example, around the edge of the hole. During this process, the position is determined from the residual voltages (zero readings subtracted from raw data) and stored in memory as well as the magnitude of the measurement error according to (7).…”

Section: Calibration Of the Devicementioning

confidence: 99%

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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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Section: Calibration Of the Devicementioning

confidence: 99%

“…Commercially available yokeless high current transducers use two discrete sensors on both sides of the bus bar [7]. The main disadvantage of using a single pair of sensors is that the suppression of the external currents by the gradiometric sensor is low.…”

Section: Introductionmentioning

confidence: 99%

Off-Center Error Correction of AMR Yokeless Current Transducer

Mlejnek

Ripka

2017

Journal of Sensors

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“…Conventional busbar sensors use a pair of Hall sensors on the conductor surface [4], [5]. Differential configuration partly suppresses the external fields.…”

Section: A Busbar Sensor With Magnetic Sensors On the Surfacementioning

confidence: 99%

“…2 for a differential magnetic sensor having a gradiometric distance of 2.7 mm. The frequency error of 16% at 1 kHz should be compared with the 32% error of the transducer based on Hall sensors on the surface of the busbar [5]. The phase error at 1 kHz is 10°, Fig.…”

Section: Sensor Design a Differential Fluxgate Sensormentioning

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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“…1,2 In the case that the measured current has DC component, Rogowski coil cannot be used and a differential magnetic sensor on the surface of the measured conductor 3 or inside the conductor 4 is typical solution. While for large currents individual discrete sensors are used, small currents up to typically 5 A can be measured by integrated sensors.…”

Section: Introductionmentioning

confidence: 99%

The effect of conductor permeability on electric current transducers

et al. 2017

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In this paper, experimental works and theoretical analysis are presented to analyze the influence of the conductor permeability on the precision of yokeless current sensors. The results of finite-element method (FEM) fit well the measured field values around the conductor. Finally we evaluate the difference in magnetic fields distribution around non-magnetic and magnetic conductor. The calculated values show that the permeability of the ferromagnetic conductor significally affects the reading of the electric current sensors even at DC.

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Realization and optimization of bus bar current transducers based on Hall effect sensors

Cited by 33 publications

References 8 publications

Off-Center Error Correction of AMR Yokeless Current Transducer

Off-Center Error Correction of AMR Yokeless Current Transducer

A Busbar Current Sensor With Frequency Compensation

The effect of conductor permeability on electric current transducers

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