The single air gap magnetic ring and the dual power supply conditioning circuit restrict miniaturization of the Hall sensor

so as to affect its application and research on intelligent contactor. The distributed multi-air gap magnetic ring is designed by theoretical calculation. Ansys Maxwell simulation analysis and comparison verification show that the multi-airgap magnetic ring can effectively reduce the leakage magnetic flux at the air gap and greatly increase the uniformity of the magnetic induction intensity at the air gap. The Hall conditioning circuit adopts single-supply power supply and dual path differential proportional amplification mode to achieve miniaturization of the circuit part. And the problem of too long response time is solved by raising the input.