Probes for current measurement in power electronics : Flux-compensated current sensor

Flux-compensated current sensor
Probes for current measurement in power electronics

Authors : François COSTA, Patrick POULICHET

Review date: February 25, 2025 | Lire en français

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4. Flux-compensated current sensor

Principle

This type of current transducer operates in a closed loop. The principle is shown in figure 11. The current to be measured I generates a flux in the magnetic circuit. It is compensated by the current i₂ from the amplifier to permanently cancel the ampere-turns : $N_{1} I = N_{2} i_{2}$

The induction sensor detects induction in the air gap. The flux controller, whose reference setpoint is zero, generates the ampere-turns required to cancel the field in the air gap. The output voltage V_s is the image of the compensation...

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Flux-compensated current sensor