Double-Core GMI Current Sensor
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Abstract
A novel design of the giant magnetoimpedance contactless current sensor is presented. A double-core structure is used in order to improve the temperature stability. The temperature coefficient of sensitivity and offset drift are reduced to one-half compared to the single-core sensor. The linearity error decreases by a factor of three. Further utilization of an ac biasing (up to 200 Hz) of the double-core sensor suppresses the temperature offset drift by a factor of 30 (down to 0.6 mA/K) and increases the open-loop linearity to 0.5% for the 2-A range.
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Malátek, M. - Ripka, P. - Kraus, L.: Double-core GMI Current Sensor In: IEEE Transactions on Magnetics. 2005, vol. 41, no. 10, p. 3703-3705. ISSN 0018-9464.