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Current-Output of Printed Circuit Board Fluxgates

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Current-output mode of PCB fluxgate sensors is presented. As the short-circuited output current sensitivity is inversely proportional to the number of turns of the pickup coil, PCB fluxgates should perform well in this mode. In order to avoid serial tuning of the sensor's output, sufficiently large series capacitor must be used mainly for pickup-coils with very low impedance. The sensitivities (with sinewave excitation and 2nd harmonic detection) have been found as 32 and 86 A/T for sensor IIIA and IIB, respectively. The noise values remain the same as in the voltage mode; however the linearity of the uncompensated sensor shows differences from the voltage mode. Sensor IIB with pickup-coil covering only one third of racetrack length (centred) showed improvement from 0.5% linearity error in voltage mode to 0.23% in the current-output mode. Sensor IIIA with long pickup-coil covering also the core ends has good linearity in the voltage mode (0.3%), however in the current-output regime it was worsened down to 3.5% nonlinearity of 100 T full-scale.
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Document Type: Research Article

Publication date: 01 June 2009

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