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The current sensor of zero flux method (Hall element detection type) achieves high performance (wide bandwidth and low noise) by adding a negative feedback circuit to the basic Hall element method. Working Principle of Zero flux method: Hall Element Detection (DC/AC) The output voltage is proportional to the electric current flowing in the conductor being measured.Ģ.This total secondary electric current flows to the shunt resistor, producing a voltage across the terminals.Then, a feedback current is added through an amplifier circuit so as to cancel out the magnetic flux (Φ-Φ’) in the low-frequency regions. The detecting coil detects this remaining magnetic flux (Φ-Φ’).However, in the low-frequency regions, the magnetic flux (Φ-Φ’) cannot be cancelled and thus remains in the magnetic circuit.In the zero-flux method, in order to cancel out the magnetic flux (Φ) produced inside the magnetic core by the AC current flowing in the conductor being measured, a secondary electric current flows to the feedback winding, inducing a secondary magnetic flux (Φ’).The current sensor of zero flux type (winding detection type) achieves high performance (high accuracy and wide bandwidth) by adding a negative feedback circuit to the basic winding method. The output voltage is proportional to the measured current. This produces a voltage across its terminals. This electric current is a sum of the current from the CT effect (current generated by the coil) and the amplifier (feedback current from Hall element detection).

The secondary electric current then flows through the coil and into the shunt resistor ( r). Then, a secondary feedback current is added through an amplifier circuit so as to cancel out the remaining magnetic flux (Φ-Φ’).

4.The Hall element detects this remaining magnetic flux (Φ-Φ’).

(The remaining magnetic flux in the magnetic core comes out to Φ-Φ’)

3.However, in the low-frequency regions resulting from DC currents, the magnetic flux cannot be cancelled and thus remains in the magnetic circuit.

(The magnetic flux of the feedback winding is marked as Φ’)

2.A secondary electric current flows to the secondary side of the feedback winding, in order to cancel out the magnetic flux produced inside the magnetic core.

1.A magnetic flux (Φ) is produced inside the magnetic core by the electric current flowing in the conductor being measured.

Note:The explanation below is based on the detection when a Hall element is used.

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