Magnetic current sensor combining two measurement paths

Magnetic current sensor, comprising a magnetic core (13) that extends around a conductor (11) in which a current (Im) to be measured flows, a measurement winding (14), an excitation circuit (23) arranged to generate a digital excitation signal (Se), an acquisition circuit (17) comprising an analog-to-digital converter (20) and arranged to acquire an analog measurement voltage (Ve) across the terminals of the measurement winding (14) and to produce a digital measurement signal (Sm), a demagnetization servocontrol circuit (32) arranged to produce, from the digital measurement signal and after a first low-pass filter, a digital demagnetization signal (Sdm) for compensating magnetic flux produced by the current that is to be measured, a summer (36) arranged to sum the digital excitation signal and the digital demagnetization signal so as to obtain a digital injection signal (Si), and an injection circuit (37) comprising a digital-to-analog converter (38) and arranged to produce an analog excitation current from the digital injection signal and to inject the analog excitation current into the measurement winding, characterized in that the sensor comprises a processing circuit (40) having a first path for processing the demagnetization signal and a second path for processing the digital measurement signal that are connected to a summer for supplying an image signal of the current, the second processing path being arranged to cancel out from the digital measurement signal at least a portion corresponding to a fundamental component of the digital excitation signal and comprising a high-pass filter that is strictly complementary to the first low-pass filter.