Sensitec Gmbh

Matthias Brusius

Claudia Glenske

A current sensor for magnetic field-based current determination of an alternating current through a current conductor is based on a magnetic field-sensitive sensor element. The sensor element is arranged spatially adjacent the current conductor to detect a magnetic field brought about by the alternating current I in the current conductor. It is proposed that at least one conductive compensation element be arranged separately from the current flow through the current conductor and spatially adjacent the sensor element and the current conductor to compensate frequency-dependent distortions of the magnetic field by means of an induction-generatable compensation magnetic field.

Magnetic field-based current sensor for frequency-compensated measurement of alternating currents

A multiphase current measuring apparatus and method for measuring current of a multiconductor current system with N current conductors, where N&#x3e;2, by determining a magnetic field strength difference in a measurement plane between conductor currents of adjacent current conductors by using the multiphase current measuring apparatus having N&#x2212;1 magnetoresistive gradient sensors. At least one bypass conductor of at least one of the further current conductors is arranged with respect to each magnetoresistive gradient sensor for compensating a DC field component of the two adjacent current conductors. The DC component of the conductor currents of the two adjacent current conductors is suppressed by passing a bypass current of the at least one further current conductor through the bypass conductor symmetrically through the measurement plane of the magnetoresistive gradient sensor.

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Munich, Georgia

Matthias Brusius