ABSTRACT
Fluxgate sensors appeared in the early 1930s and are used in many applications that require high precision, because this is one of the most accurate technologies for sensing magnetic fields. The two magnitudes utilized to represent this movement are the difference in electric potential and the electric current. In current sensors based on closed-loop configuration, a secondary winding is incorporated into the magnetic core and the output signal of the magnetic field sensor is used for generating the secondary current. The commercial current sensors include additional electronic circuitry devoted to compensate this voltage and differences on thermal drifts. Magnetoresistance is defined as the property of a material to change the value of its electrical resistance when it is submitted to an external magnetic field. The anisotropic magnetoresistance (AMR) effect is associated with Hall effect elements. AMR current sensors are available in both open-loop and closed-loop configurations but are always configured in a Wheatstone bridge.
