Onehall sensor There are generally four lead out terminals, two of which are the input terminals for the bias current of Hall elements, and the other two areHallThe output terminal of the voltage. If the two output terminals form an external circuit, Hall current will be generated.

Generally speaking, the setting of bias current is usually provided by an external reference voltage source; If high precision is required, the reference voltage source should be replaced with a constant current source. In order to achieve high sensitivity, some Hall elements have coated alloys with high magnetic permeability on their sensing surfaces; This type of sensorHallThe potential is relatively high, but saturation occurs at around 0.05T, and it is only suitable for use at low limits and small ranges.

Advantages of Hall sensors:

Hall sensorThe device can measure current and voltage of any waveform, such as DC, AC, pulse waveform, etc., and even measure transient peak values. The secondary current faithfully reflects the waveform of the primary current. However, ordinary transformers are incomparable and are generally only suitable for measuring 50Hz sine waves;

There is good electrical isolation between the primary and secondary circuits, with an isolation voltage of up to 9600Vrms;

3. High precision: The precision is better than 1% within the working temperature range, which is suitable for measuring any waveform;

4. Good linearity: better than 0.1%;

5. Wide bandwidth: The rise time of high bandwidth current sensors can be less than 1 μ s; However, the bandwidth of the voltage sensor is relatively narrow, generally within 15kHz. The rise time of a 6400Vrms high-voltage voltage sensor is about 500uS, and the bandwidth is about 700Hz.