Current sensor principle

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Guide: A current sensor , a kind of sensor used to sense the current. It has been seen everywhere in our daily life, such as household appliances, electric vehicles, inverters, etc. How does the current sensor come from? To achieve the measurement of current? Hurry up and find the answer below~

First, the principle of current sensor - - Introduction

The current sensor, the English name is current sensor, also known as the magnetic sensor, is a detection device that uses the Hall magnetic balance principle to sense the measured current information and output it into the required form information. It has high sensitivity and resistance. The characteristics of strong interference have been widely used in smart grids, household appliances, computer hard drives and other necessities.

Second, the principle of current sensor - - classification

Current sensors have different classification methods according to different classification forms. They can be divided into electronic current transformers, electromagnetic current transformers and shunts according to different working principles. Electronic current transformers include variable frequency power sensors and Rocco. Fusky current sensor, Hall current sensor, etc., have a wider transmission frequency band, smaller size, lighter weight, smaller secondary load capacity, etc. than the electromagnetic current sensor, and gradually occupy the current sensor. Most markets. Next, we will use the classic Hall current sensor as an example to describe the current sensor principle .

Third, the current sensor principle - Hall current sensor

The Hall current sensor is based on the Hall effect and uses the Hall magnetic balance principle to measure various types of currents. First, the measured current is input to the control current terminal of the Hall element, and secondly, the normal direction of the Hall element plane is applied. The magnetic field (intensity B) will eventually generate a potential at the output of the Hall element, called the Hall potential (the direction is perpendicular to the direction of the current and the direction of the magnetic field). The waveform of this potential is consistent with the input current, so it can be accurately Reflects the change in the measured current.

Fourth, the principle of current sensor - - fiber optic current sensor

The fiber-optic current sensor is a new type of current sensor that uses fiber as the transmission medium to perform current sensing based on the Faraday magneto-optical effect. The Faraday effect refers to the fact that if a magnetic field parallel to its propagation direction is applied during the propagation of linearly polarized light, the direction of vibration of the light will be deflected, and the angle of deflection is proportional to the strength of the magnetic field and the length of the light through the medium. The fiber-optic current sensor formed based on this principle has the characteristics of easy installation, strong anti-interference and small transmission loss, and is gradually being widely used.

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