The specific working process of the magnetic balance current sensor

The specific working process of the magnetic balance current sensor is: when a current flows through the main circuit, the magnetic field generated on the wire is concentrated by the collecting ring and sensed on the Hall device, and the generated signal output is used to drive the corresponding power tube and Turn it on to obtain a compensation current Is. This current then generates a magnetic field through a multi-turn winding that is exactly opposite to the magnetic field produced by the current being measured, thereby compensating for the original magnetic field and gradually reducing the output of the Hall device. When the magnetic field generated by multiplying Ip and the number of turns is equal, Is no longer increases. At this time, the Hall device acts to indicate zero flux, which can be balanced by Is. Any change in the measured current will destroy this balance. Once the magnetic field is out of balance, the Hall device has a signal output. Immediately after power amplification, a corresponding current flows through the secondary winding to compensate for the unbalanced magnetic field. From the imbalance of the magnetic field to the rebalancing, the time required is theoretically less than 1 μs, which is a process of dynamic equilibrium.