This article describes the characteristics of the Hall sensor.
The main characteristic parameters of Hall sensorI mentioned earlier that the Hall sensor is a magnetic field sensor made according to the Hall effect. Its main characteristic parameters are as follows.
1. Input resistance R
The DC resistance at the two excitation current ends of the Hall sensor element is called the input resistance. Its value ranges from a few ohms to hundreds of ohms, depending on the components of different models.
The temperature rises, the input resistance becomes smaller, so that the input current becomes larger, and finally the Hall sensor potential changes. In order to reduce this influence, it is best to use a constant current source as the excitation source.
2. Output resistance R
The resistance between the potential output terminals of the two Hall sensors is called the output resistance, and its number is the same order of magnitude as the input resistance. It also changes along with the temperature. Choosing an appropriate load resistance is easy to match it, and the drift of the electric potential caused by temperature can be minimized.
3. Maximum excitation current I-Hall sensor parameters
Since the potential of the Hall sensor increases with the increase of the excitation current, it is always desirable to choose a larger excitation current of 1M in the application, but the excitation current increases, the power consumption of the Chenger element increases, and the temperature skin of the element increases. As a result, the temperature drift of the Hall sensor's potential is increased. Therefore, several pieces of each model have specified the corresponding maximum excitation current, and its value ranges from several milliamperes to several hundred milliamperes.
4. Sensitivity
Sensitivity KH=EH/IB, its value is about 10MV (MA.T).
5. Maximum magnetic induction intensity BM---Hall sensor parameters
When the magnetic induction intensity exceeds BM, the non-linear error of the Hall sensor potential will increase significantly, and Tess picks up (T) into several thousand Gauss (Gs) (1Gs=104T).
6. equipotential potential
At the rated excitation current F, when the external magnetic field is zero, it is the error caused by the asymmetry of the geometrical dimensions of the 4 poles.
7. Hall sensor tun potential temperature coefficient
The value of 6M is generally the open circuit voltage between the output terminals of the zero-knife Hall sensor called the unequal potential. When used, the bridge method is often used to compensate for the unequal potential caused by a certain magnetic induction intensity and excitation current. When the temperature changes by 1 degree Celsius, the percentage of the Hall sensor potential change is weak as the Hall sensor potential temperature coefficient, which is related to the material of the Hall sensor element.
8. Classification of Hall sensors
Hall sensors are divided into linear Hall sensors and switch Hall sensors.
(1) Linear Hall sensor is composed of Hall element, linear amplifier and emitter follower, it outputs analog quantity.
(2) The switch-type Hall sensor is composed of a voltage regulator, a Hall element, a differential amplifier, a Schmitt trigger and an output stage, and it outputs a digital quantity.
According to the nature of the detected objects, their applications can be divided into direct applications and indirect applications. The former is to directly detect the magnetic field or magnetic properties of the subject itself, and the latter is to detect the artificially set magnetic field on the subject.
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