A Technique to Enhance the Frequency Bandwidth of Contactless Magnetoresistive Current Sensors

Nibir, Shahriar Jalal; Hurwitz, Elisa; Karami, Morteza; Parkhideh, Babak

doi:10.1109/tie.2016.2561264

Cited by 33 publications

(3 citation statements)

References 13 publications

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“…Its illustration is given in Fig. 12, and as expected, the magnitude of the uniform magnetic field depends on the current [121]. By next varying the material and thickness of the trace, different levels of magnetic field normalization can be achieved [122], which certainly are some degrees of design freedom for exploration.…”

Section: Mr Current Sensormentioning

confidence: 66%

A Review of Megahertz Current Sensors for Megahertz Power Converters

Xin

Liu

et al. 2022

IEEE Trans. Power Electron.

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Within a power converter, multiple currents are usually measured for control, protection, and/or monitoring. They are therefore important sources of information, which must unquestionably be measured accurately to maintain continuous and reliable operation of the power converter. Accurate current measurement has however become tougher with the introduction of wide band-gap (WBG) devices with switching frequency tending towards the Megahertz (MHz) range. Because of that, the installed current sensors must have a significantly widened bandwidth. Moreover, they must be nonintrusive and compact, in order not to degrade fast switching characteristics and high power density of the WBG converter. Presently, these features are not collectively obtainable from existing commercial current sensors. Consequently, many new current sensing techniques have surfaced in the literature for usage with the more demanding MHz power converter. These new techniques, some classical techniques, and their hybrid integrations are now reviewed, after overviewing functionalities made possible by current sensors in a power converter. Last but importantly, some future developmental trends aimed at matching MHz current sensors with MHz power converters are described, before concluding the paper.

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Section: Mr Current Sensormentioning

confidence: 66%

A Review of Megahertz Current Sensors for Megahertz Power Converters

Xin

Liu

et al. 2022

IEEE Trans. Power Electron.

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“…There are several magneto resistance effects that can be used to measure currents. From them, anisotropic magneto resistance (AMR) bandwidth can be extended to the MHz range [18]. Giant magneto resistive (GMR) based sensors are very susceptible to stray magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

AC/DC Current Sensor for Rotating Applications

Pardo-Vicente

Platero

Sánchez-Fernández

et al. 2020

Sensors

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There are several techniques for current measurement. Most of them are capable of measuring both alternating and direct current (AC/DC) components. However, they have severe drawbacks for rotating applications (large size, sensitivity to external fields, and low signal amplitude). In addition to these weaknesses, measured signals should be transmitted to a stationary part. In order to contribute solving these difficulties, this paper presents a sensor that can measure AC/DC simultaneously based on the electromagnetic coupling of two coils. To this aim, the measured waveform is analysed. In this paper, the design of such a sensor is presented. This design is validated through computer simulations and a prototype is built. The performance of this sensor prototype is analysed through experimental tests.

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“…However, the integration of GMR elements in a bus bar design makes it vulnerable to the heat generated by a high injection current. In addition, the lack of symmetry in the arrangement of sensors and the current path reduces the bandwidth of sensing due to the change in the surface current distribution at high frequencies, i.e., the skin effect [9]. In contrast, the GMR current sensor with a magnetic ring shows a lower temperature coefficient, as well as a better immunity from the skin effect [10].…”

Section: Introductionmentioning

confidence: 99%

Quasi-Static Current Measurement with Field-Modulated Spin-Valve GMR Sensors

Jeng

Trinh

Hung

et al. 2019

Sensors

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A non-contact current measurement device comprised of a GMR sensor and a ferrite ring core was investigated. The sensor chip employed a high-sensitivity spin-valve full-bridge GMR sensor of which the direct output has non-negligible hysteresis and a limited linear range. By applying an AC modulation current to modulate the output of the GMR sensor, the hysteresis was reduced, and the linear range was over ±0.5 A. The resolution for DC and quasi-static current measurement was 0.1 mA at a 10 Hz bandwidth. The output in proportion to the measured current was obtained either by demodulating the current-sensitive AC signal or by employing the filtered output of the intrinsically nonlinear spin-valve response. The proposed current sensing scheme is suitable for quasi-static current measurement from DC to over 100 Hz.

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A Technique to Enhance the Frequency Bandwidth of Contactless Magnetoresistive Current Sensors

Cited by 33 publications

References 13 publications

A Review of Megahertz Current Sensors for Megahertz Power Converters

A Review of Megahertz Current Sensors for Megahertz Power Converters

AC/DC Current Sensor for Rotating Applications

Quasi-Static Current Measurement with Field-Modulated Spin-Valve GMR Sensors

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