Patent ID: 10884028

Abstract:
A fluxgate current sensor comprising an excitation coil (13), an excitation module (20) for generating an excitation voltage (Ve), a measurement coil (14) conveying an induced measurement current (Iim), and a measurement synchronous demodulator (12) for the purpose of multiplying the induced measurement current by a demodulation signal of frequency 2f0 in order to obtain an image voltage that is the image of the current for measuring. The excitation voltage (Ve) is obtained from a first voltage of frequency f0 and from a second voltage of frequency 3f0, the fluxgate current sensor further includes a servo-control coil (15) conveying an induced servo-control current, and a servo-control synchronous demodulator (30) for the purpose of multiplying the induced servo-control current by a demodulation signal of frequency 3f0. The servo-control synchronous demodulator is connected to the excitation module in order to servo-control the excitation voltage in such a manner as to cancel the component of frequency 3f0 in the induced servo-control current.