Principle and application of current sensor

one, working principle

The current sensor is based on hall magnetic balance principle (closed loop) and hall direct measurement (open loop).

1, the principle of open loop current sensor: the original boundary flux produced by the current IP is high quality core gathered in magnetic circuit, the hall element is fixed in a small air gap, the magnetic flux test, linear hall hall device output voltage after dealing with the special circuit, output and the original vice side waveform consistent with output voltage, the voltage accurately reflect changes in the primary side current.

2. The magnetic balance current sensor is also called the compensation sensor, that is, the magnetic field generated by the measured current Ip in the main loop at the magnetic ring is compensated by a secondary coil and the magnetic field generated by the current is compensated, so that the hall device is in the working state of detecting zero magnetic flux.

The specific working process of the magnetic balance current sensor Is as follows: when there Is a current passing through the main loop, the magnetic field generated on the wire Is gathered by the magnetic ring and induced to the hall device, and the generated signal output Is used to drive the corresponding power tube and conduct it, so as to obtain a compensating current Is.This current then generates a magnetic field through the multi-turn winding, which is opposite to the magnetic field generated by the measured current, thus compensating the original magnetic field and gradually reducing the output of the hall device.When the magnetic field generated by the multiplication of Ip and turns Is equal, Is will not increase. At this time, the hall device plays the role of indicating zero magnetic flux, which can be balanced by Is.Any change in the measured current will upset this balance.Once the magnetic field is out of balance, the hall device has signal output.After power amplification, a corresponding current immediately flows through the secondary winding to compensate for the unbalanced magnetic field.It theoretically takes less than 1 s to go from magnetic field imbalance to rebalance, which is a process of dynamic equilibrium.

Second, use

The application of current sensor in wind power generation: as a kind of clean and renewable energy, wind energy has attracted more and more attention from countries all over the world.The global wind energy is about 2.74 109GW, among which the available wind energy is 2 107GW, which is 10 times more than the total amount of water energy that can be exploited on the earth.Wind has long been harnessed -- primarily by windmills to pump water, grind flour and so on -- but in the new century there is an interest in how it can be used to generate electricity and how it can be maximised.As the main detecting element, the current sensor plays an important role.

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