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

Isolated wideband current measurement is required in many power electronic converters when the switching frequency is above 1 MHz. Typically current passing through a printed circuit board trace induces a highly nonuniform magnetic field which varies as a function of frequency and position relative...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2016-09, Vol.63 (9), p.5682-5686
Main Authors: Nibir, Shahriar Jalal, Hurwitz, Elisa, Karami, Morteza, Parkhideh, Babak
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistor
Bandwidth
Boards
Current measurement
current sensor
electromagnetic interference (EMI)
Electronics
Frequency ranges
Magnetic fields
Magnetic sensors
Nonuniform magnetic fields
power converter
Printed circuits
Sensitivity
Sensors
Wideband
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Summary:Isolated wideband current measurement is required in many power electronic converters when the switching frequency is above 1 MHz. Typically current passing through a printed circuit board trace induces a highly nonuniform magnetic field which varies as a function of frequency and position relative to the trace. This paper proposes a technique to increase the frequency bandwidth of anisotropic magnetoresistive (AMR) current sensors and simultaneously to intensify and normalize the field detected by the sensor in the frequency range of interest, i.e., DC-5 MHz. We demonstrate experimentally that the proposed technique yields significant enhancement in detection bandwidth of AMR current sensors.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2016.2561264