Introduction to the principle of current sensor
Current sensor, a kind of sensor, is used to realize the induction of current. It can be seen everywhere in our daily life, such as home appliances, electric vehicles, frequency converters, etc., so how does the current sensor measure the current? Find out the answer in the following quickly
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1、 Principle of current sensor
Current sensor, English name is current sensor, also known as magnetic sensor, is a detection device which uses Hall magnetic balance principle to complete the induction of measured current information and output it as the required form of information. It has the characteristics of high sensitivity and strong anti-interference. It has been widely used in smart grid, household appliances, computer hard disk and other daily necessities.
2、 Principle of current sensor -- Classification
According to different classification forms, current sensors have different classification methods, which can be divided into electronic current transformer, electromagnetic current transformer and shunt device according to different working principles. Among them, electronic current transformer includes frequency conversion power sensor, rokovsky current sensor, Hall current sensor, etc., which has wider transmission than electromagnetic current sensor The frequency band of the sensor will be smaller and the secondary load will be smaller and heavier. Let's take the current sensor as an example.
3、 Principle of current sensor Hall current sensor
Hall current sensor is based on Hall effect and uses Hall magnetic balance principle to measure various types of current. Firstly, the measured current is input at the control current end of the hall element, secondly, a magnetic field (strength b) is applied in the normal direction of the hall element plane, and finally a potential is generated at the output end of the hall element, which is called Hall potential (the direction is perpendicular to the current direction and Therefore, the direction of the input current can be accurately reflected.
4、 Principle of current sensor -- optical fiber current sensor
Optical fiber current sensor is a new type of current sensor. It uses optical fiber as transmission medium and completes current induction based on Faraday magneto-optical effect. Faraday effect refers to that if a magnetic field parallel to its propagation direction is added in the propagation process of linearly polarized light, the vibration direction of light will deflect, and the deflection angle is proportional to the intensity of magnetic field and the length of light passing through the medium. The optical fiber current sensor based on this principle has the characteristics of easy installation, strong anti-interference and low transmission loss, and is gradually being applied more widely.