Patent ID: 6078172
Filing Date: 2000-06-20
Classification: G01R,H01F

Abstract:
A current sensor, comprising:a soft-magnetic magnet core formed of a material having a flat magnetization curve;a primary winding wound on said soft-magnetic magnet core for conducting a flow of a current to be measured;a secondary winding wound on said soft-magnetic magnet core for receiving an alternating current saturating said magnet core alternately in at least one direction;an evaluation circuit determining a flux produced in said magnet core by said primary winding and comparing positive and negative current peaks through said secondary winding with one another;an amplifier receiving the positive and negative current peaks through said secondary winding and having an output causing a compensation current to flow through said secondary winding;a first and a second high-pass filter connected to said secondary winding for coupling the alternating current into said secondary winding; anda first low-pass filter connected between said secondary winding and said first high pass filter and a second low-pass filter connected between said secondary winding and said second high pass filter for coupling the compensation current into said secondary winding.