Patent ID: 8378675

Claim:
A current sensor for measuring a current in a conductor, comprising: two magnetic field sensors located adjacent to the conductor, wherein the two magnetic field sensors are at least two-dimensional magnetic field sensors having two measuring directions; and an integrated evaluation unit configured to: (a) measure values of the magnetic field sensors to determine: (i) a test field in the direction of the field lines of the magnetic field based on the current flowing in the conductor, and (ii) an interference field in a direction perpendicular to field lines of the magnetic field based on the current flowing in the conductor; (b) detect an inhomogeneity of the interference field from the field strengths of the determined components of the interference field; (c) determine a useful field from the field strengths of the test field and the inhomogeneity of the interference field; and (d) determine the current in the conductor from the useful field.