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Is the Hall Current Sensor Made According to the Principle of Hall Effect?

09. 15, 2020

As a Micropower Hall Effect Sensor Manufacturer, share with you. The Hall current sensor is made according to the principle of Hall effect, applying ampere's law, that is, a magnetic field proportional to the current is generated around a current-carrying conductor, and the Hall device is used to measure this magnetic field. Therefore, non-contact measurement of current is possible.

Main characteristic parameters of Hall current sensor:

Hall Effect Sensor

Hall Effect Sensor

1. Standard rated value IPN and rated output current ISN

IPN refers to the standard rated value that the current sensor can test, which is expressed by the effective value (A.r.m.s). 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, it may be different according to some models.

2. Offset current ISO

The offset current is also called residual current or residual current, which is mainly caused by the unstable working state of the operational amplifier in the Hall element or the electronic circuit. When the current sensor is in production, the offset current has been adjusted to the minimum at 25°C and IP=0, but when the sensor leaves the production line, a certain amount of offset current will be generated. The accuracy mentioned in the product technical documentation has taken into account the effect of increased offset current.

3. Linearity

Linearity determines the degree to which the sensor output signal (secondary current IS) is proportional to the input signal (primary current IP) within the measurement range. The current sensor linearity of Nanjing Zhongxu Electronic Technology Co., Ltd. is better than 0.5%.

4. Temperature drift

The offset current ISO is calculated at 25°C. When the ambient temperature around the Hall electrode changes, ISO will change. Therefore, it is important to consider the maximum change of the offset current ISO, where IOT refers to the temperature drift value in the current sensor performance table.

5. Overload

The overload capability of a current sensor means that when a current overload occurs, the primary current will still increase outside the measurement range, and the duration of the overload current may be short, and the overload value may exceed the allowable value of the sensor. Overload current value sensor Generally, it cannot be measured, but it will not damage the sensor.

6. Precision

The accuracy of the Hall effect sensor depends on the standard rated current IPN. At +25℃, the measurement accuracy of the sensor has a certain influence on the primary current, and the influence of offset current, linearity, and temperature drift must also be considered when evaluating the accuracy of the sensor.

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