The specific working principle of the current sensor is: when the main circuit has a large current Ip, a strong magnetic field will be generated around the conductor. The magnetic field is collected by the multi-magnetic ring and acts on the current sensor device to make it have a signal output. This signal is amplified by amplifier A and input to the power amplifier. At this time, the corresponding voltage drop of the power tube changes to obtain the compensation current Is. Since Is current flows too much, the winding generates a magnetic field Hs.
Hs is opposite to the magnetic field Hp generated by the main current Ip, thereby compensating the original magnetic field, gradually reducing the signal output from the Hall device, and finally multiplying Is and the number of turns to generate the magnetic field and the field generated by the Ip. When it is equal, Is no longer increases. At this time, the current sensor reaches zero magnetic flux detection.
How to choose the current sensor:
Hall current sensors are based on the principle of magnetically balanced Hall. According to the Hall effect principle, a current Ic is applied from the control current terminal of the Hall element, and a magnetic field having a magnetic field strength of B is applied in the normal direction of the Hall element plane. Then, in a direction perpendicular to the current and the magnetic field (ie, between the Hall output terminals), a potential VH will be generated, which is called a Hall potential, which is proportional to the control current I. product. That is, where K is the Hall coefficient, which is determined by the material of the Hall element; one, controlling the current; B is the magnetic field strength; VH is the potential of the Hall.
Current sensor application:
Current sensors have applications in many areas, such as battery monitoring, automotive, industrial, railway, locomotive, on-board power testing, energy, and automation.
The main characteristic parameters of the current sensor:
1, the linear
Linearity determines the degree to which the current sensor output signal (secondary current IS) and input signal (primary current IP) are directly proportional to the measurement range.
2, temperature drift
The offset current ISO is calculated at 25 ° C. When the ambient temperature around the Hall electrode changes, the ISO will change. Therefore, it is important to consider the maximum change in the offset current ISO, where IOT refers to the temperature drift value in the current current sensor performance table.
3. Offset current ISO
The offset current is also called residual current or residual current. This is mainly caused by the instability of the operational amplifier in the Hall element or electronic circuit. When the current sensor is manufactured at 25 ° C and IP = 0, the offset current is minimized, but the sensor generates a certain amount of offset current when it leaves the production line.
4, and the standard ratings IPN refers to the rated output current ISNIPN standard rating of the current sensor can be tested. It is represented by the effective value (Arms). The size of the IPN is related to the model of the sensor product. ISN refers to the rated output current of the current sensor, generally 10 ~ 400mA. Of course, this may vary by model.
5, Accuracy
The accuracy of the Hall effect current sensor depends on the standard rated current IPN. At + 25 ° C, the measurement accuracy of the sensor has a certain effect on the primary current. At the same time, when evaluating the accuracy of the current sensor, the effects of offset current, linearity and temperature drift must also be considered.
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