Hall current sensor working principle - Database & Sql Blog Articles

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inductance

1. Direct-release (open loop) current sensor (CS series) When the primary current I _P flows through a long wire, a magnetic field is generated around the wire. The magnitude of this magnetic field is proportional to the current flowing through the wire. The generated magnetic field is concentrated in the magnetic ring and passes through the magnetic ring air gap. The medium Hall element measures and amplifies the output, and its output voltage V _S accurately reflects the primary current I _P . The typical rated output is calibrated to 4V. 2, magnetic balance (closed loop) current sensor (CSM series) The magnetic balance type current sensor is also called a compensation type sensor, that is, the magnetic field generated by the primary side current Ip at the collecting magnetic ring is compensated by the magnetic field generated by a secondary coil current, and the compensation current Is accurately reflects the primary side current Ip, thereby The Hall device is placed in an operating state that detects zero flux. The specific working process is: when a current flows through the main circuit, the magnetic field generated on the wire is collected by the magnetic ring and sensed on the Hall device, and the generated signal output is used to drive the power tube and turn it on, thereby obtaining a compensation. Current Is. This current then generates a magnetic field through the multi-turn winding, which is exactly opposite to the magnetic field generated by the current being measured, thus compensating for the original magnetic field, causing the output of the Hall device to gradually decrease. 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 functions to indicate zero magnetic flux, and Ip can be tested by Is at this time. When Ip changes, the balance is destroyed, and the Hall device has a signal output, that is, the above process is repeated to reach equilibrium again. 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. Therefore, from a macro perspective, the secondary compensation current ampere is equal to the number of ampere-turns of the primary measured current at any time. 3. Hall voltage (closed loop) sensor (VSM series)
The Hall voltage sensor works like a closed-loop current sensor and works in a magnetically balanced manner. The primary voltage V _P generates a current through the current limiting resistor Ri, flows through the primary coil to generate a magnetic field, and is collected in the magnetic ring, and the compensation current I _S controlled by the output signal of the Hall element in the magnetic ring air gap flows through the secondary coil. The magnetic field is compensated, and its compensation current I _S accurately reflects the primary voltage V _P . 4, AC current sensor (A-CS series) AC current sensor mainly measures the AC signal light current. The AC signal induced by the Hall is converted into a standard DC signal output of 0 to 4V, 0 to 20 mA (or 4 to 20 mA) through AC-DC and other conversions for use in various systems.