High Accuracy Open-Type Current Sensor with a Differential Planar Hall Resistive Sensor

Lee, Sungho; Hong, Sungmin; Park, Wonki; Kim, Won-Hyo; Lee, Jae‐Hoon; Shin, Kijung; Kim, CheolGi; Lee, Daesung

doi:10.3390/s18072231

Cited by 14 publications

(11 citation statements)

References 25 publications

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“…A typical bandwidth of this method is between 10 and 100 kHz. The current is indirectly measured via a magnetic circuit, which may be: open-air, in which a current passes by the Hall sensor or two Hall sensors operating in differential mode [ 11 ], mainly to improve the immunity to external fields. This method is typically used for high currents above 100 A, using a soft magnetic material with an air-gap into which a Hall sensor is placed.…”

Section: Related Backgroundmentioning

confidence: 99%

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High Precision Wide Bandwidth DC Current Transducer Based on the Platiše Flux Sensor

Platiše

Kanalec²,

Mohorčič

2020

Sensors

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In the last decade, we observed a noticeable increase in direct-current systems (DC), particularly in solar power generation, grid storage systems, and electric mobility. Some of these systems may require high-voltage isolation and peak currents in excess of kA. The existing standard compact and lower cost current sensing solutions hardly ever achieve an overall measurement uncertainty below 1% mainly due to offsets and hysteresis; their typical bandwidth is about 250 kHz, and they may also be noisy. This article presents a new method of isolated DC and AC current measurement based on a single gapless core and the innovative Platiše Flux Sensor. After verification in a mixed-signal simulator, the method was implemented in a functional prototype of a DC current transducer (CT) and thoroughly tested in a reference setup. The performance tests showed a low offset and hysteresis, a bandwidth in the MHz range, low power consumption, and low noise operation. Furthermore, the low current transducer achieved a typical uncertainty of less than 0.2% and a linearity of less than 200 ppm, which indicates an overall superior performance compared to representative comparable CTs based on alternative technologies. In addition to the areas of application mentioned above, the new type of DC-CT can be used for general purpose metering, measurement instrumentation, and high power DC and AC systems.

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Section: Related Backgroundmentioning

confidence: 99%

“…open-air, in which a current passes by the Hall sensor or two Hall sensors operating in differential mode [ 11 ], mainly to improve the immunity to external fields. This method is typically used for high currents above 100 A,…”

Section: Related Backgroundmentioning

confidence: 99%

High Precision Wide Bandwidth DC Current Transducer Based on the Platiše Flux Sensor

Platiše

Kanalec²,

Mohorčič

2020

Sensors

View full text Add to dashboard Cite

show abstract

“…On the other hand, magnetoresistive sensors (MR) made of magnetic thin films can exhibit much higher sensitivities, being able to detect magnetic fields in the 10 −9 –10 −2 T domain [ 13 ]. This can lead to simplification of the current measurement chain, the sensor being sensitive to in-plane magnetic fields, extending the current measurement range for values lower than 1 mA, allowing the possibility for developing special applications with reduced power consumption and price [ 8 , 9 , 11 , 14 ]. Also, it should be mentioned that for MR sensors the response characteristics like sensitivity, linearity, saturation field, noise, etc., are strongly affected by the magnetic properties of the utilized materials, the structure of their underlying multilayered and the layout of the microfabricated sensor.…”

Section: Introductionmentioning

confidence: 99%

Low Field Optimization of a Non-Contacting High-Sensitivity GMR-Based DC/AC Current Sensor

Musuroi

Oproiu

Volmer

et al. 2021

Sensors

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Many applications require galvanic isolation between the circuit where the current is flowing and the measurement device. While for AC, the current transformer is the method of choice, in DC and, especially for low currents, other sensing methods must be used. This paper aims to provide a practical method of improving the sensitivity and linearity of a giant magnetoresistance (GMR)-based current sensor by adapting a set of design rules and methods easy to be implemented. Our approach utilizes a multi-trace current trace and a double differential GMR based detection system. This essentially constitutes a planar coil which would effectively increase the usable magnetic field detected by the GMR sensor. An analytical model is developed for calculating the magnetic field generated by the current in the GMR sensing area which showed a significant increase in sensitivity up to 13 times compared with a single biased sensor. The experimental setup can measure both DC and AC currents between 2–300 mA, with a sensitivity between 15.62 to 23.19 mV/mA, for biasing fields between 4 to 8 Oe with a detection limit of 100 μA in DC and 100 to 300 μA in AC from 10 Hz to 50 kHz. Because of the double differential setup, the detection system has a high immunity to external magnetic fields and a temperature drift of the offset of about −2.59 × 10−4 A/°C. Finally, this setup was adapted for detection of magnetic nanoparticles (MNPs) which can be used to label biomolecules in lab-on-a-chip applications and preliminary results are reported.

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“…Hall sensors based on CMOS (Complementary Metal-Oxide-Semiconductor Transistor) technology are widely applied in the manufacturing, medical devices, consumer electronics, automobile, and aerospace fields nowadays due to their low cost, high integration ability, and good reliability [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Hall sensors have many practical advantages, including non-contact operation, high linearity, physical sturdiness, and versatility [ 8 , 9 , 10 ]. As a result, they have attracted significant attention throughout industry and academia in recent years [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Application of MEMS-Based Hall Sensor Array for Magnetic Field Mapping

et al. 2021

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A magnetic field measurement system based on an array of Hall sensors is proposed. The sensors are fabricated using conventional microelectromechanical systems (MEMS) techniques and consist of a P-type silicon substrate, a silicon dioxide isolation layer, a phosphide-doped cross-shaped detection zone, and gold signal leads. When placed within a magnetic field, the interaction between the local magnetic field produced by the working current and the external magnetic field generates a measurable Hall voltage from which the strength of the external magnetic field is then derived. Four Hall sensors are fabricated incorporating cross-shaped detection zones with an identical aspect ratio (2.625) but different sizes (S, M, L, and XL). For a given working current, the sensitivities and response times of the four devices are found to be almost the same. However, the offset voltage increases with the increasing size of the detection zone. A 3 × 3 array of sensors is assembled into a 3D-printed frame and used to determine the magnetic field distributions of a single magnet and a group of three magnets, respectively. The results show that the constructed 2D magnetic field contour maps accurately reproduce both the locations of the individual magnets and the distributions of the magnetic fields around them.

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High Accuracy Open-Type Current Sensor with a Differential Planar Hall Resistive Sensor

Cited by 14 publications

References 25 publications

High Precision Wide Bandwidth DC Current Transducer Based on the Platiše Flux Sensor

High Precision Wide Bandwidth DC Current Transducer Based on the Platiše Flux Sensor

Low Field Optimization of a Non-Contacting High-Sensitivity GMR-Based DC/AC Current Sensor

Design and Application of MEMS-Based Hall Sensor Array for Magnetic Field Mapping

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