Current sensor with flux gate

A flux gate current sensor comprising:

• a magnetic core extending around a conductor in which there flows a current that is to be measured;
• a measurement winding;
• an excitation circuit arranged to generate a digital excitation signal;
• an acquisition circuit comprising an analog-to-digital converter and arranged to acquire an analog measurement voltage from terminals of the measurement winding and to produce a digital measurement signal (Sm);
• a demagnetization servocontrol circuit arranged to use the digital measurement signal to produce a digital demagnetization signal for compensating magnetic flux produced by the current that is to be measured;
• a summing circuit arranged to sum the digital excitation signal and the digital demagnetization signal so as to obtain a digital injection signal;
• and
• an injection circuit comprising a digital-to-analog converter and arranged to produce an analog excitation current from the digital injection signal and to inject the analog excitation current into the measurement winding.