Abstract
A fast magnetization reversal in a twisted FeCoV wire induces a pulse voltage in a pick-up coil wound around a wire. The Wiegand sensor is composed of this magnetic wire and the pick-up coil. As the output pulse voltage does not depend on a changing ratio of the applied magnetic field to switch the magnetization of the wire, the Wiegand sensor is used for to perform rotation and other detections. Recently, the Wiegand sensor has attracted significant attention as a power supply for battery-less operation of electric devices and for energy harvesting. In this study, we propose a concept of obtaining an intrinsic pulse voltage from the Wiegand sensor as its power source, and demonstrate its effectiveness in circuit simulation. The equivalent circuit for the Wiegand sensor is expressed by the intrinsic pulse voltage, internal resistance, and inductance of the pick-up coil. This voltage as a power source and circuit parameters are determined by MATLAB/Simulink simulation. The output voltage calculated using the equivalent circuit of the Wiegand sensor agrees with the experimentally measured results.
Highlights
The power supply for electric devices connected to the internet is significant to the realization of the Internet of Things
We demonstrate the concept of an equivalent circuit for the Wiegand sensor, which is expressed by the intrinsic pulse voltage, Sensors
We propose the concept of an intrinsic pulse voltage from the Wiegand sensor as
Summary
The power supply for electric devices connected to the internet is significant to the realization of the Internet of Things. It is not often easy to use power cables based on the location of devices and the high cost that that incurs. Using a battery may prevent the need for power cables; the battery needs to be replaced after a certain period of time. The Wiegand sensor [2,3] is studied as a power generation element for energy harvesting. This sensor has the advantage of output pulse voltage which is independent of the changing rate of the externally applied magnetic field [4]
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