Patent ID: 9638722
Date: 2017-05-02
CPC Classifications: G01R

Claim:
1. A current sensor for detecting a magnitude of a current flowing through a conductor, comprising: an induction coil associated with the conductor, the induction coil providing an induction signal proportional to the time derivative of the current magnitude; a Hall sensor associated with the conductor, the Hall sensor providing a Hall signal proportional to the current magnitude; a calibration coil associated with the Hall sensor, the calibration coil being loaded by a generator continuously with a calibration current of defined frequency so that the calibration coil creates a defined magnetic field in the Hall sensor; a first evaluation circuit having an input which receives the induction signal; a second evaluation circuit with a low-pass filter having an input which receives the Hall signal; a third evaluation circuit which evaluates a part of the Hall signal which is attributed to the calibration current, and which defines a parameter of the second evaluation circuit; and a fourth evaluation circuit for generating an output signal that represents the current magnitude and is the sum of an output signal of the first evaluation circuit and an output signal of the second evaluation circuit minus the part of the output signal of the second evaluation circuit which is attributed to the calibration current.