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What is the Working Principle of Hall Sensors Commonly Used in Automobiles?

Feb. 19, 2021

As a Hall Sensor Suppliers, share with you.

Hall sensor is an electronic component that is often used in cars. So, what kind of working principle of Hall sensor, what types are it divided into, and what specific use cases are there, many friends may not be familiar with it. Today, the editor intends to talk about the content of the Hall sensor with you based on these points. This idea is also because of a practical problem encountered by the editor some time ago, which triggered the editor to learn more. I also share some of my shallow knowledge with everyone.

What is the Working Principle of Hall Sensors Commonly Used in Automobiles?cid=191

Hall Effect Sensor

How the Hall sensor works

First of all, let's start with the working principle of the Hall sensor. This knowledge is easy to find on the Internet, and its essence is the knowledge we learned in high school physics-the magnetoelectric effect. Simply put, when the carriers in a solid material are affected by an external magnetic field, they will be deflected due to the influence of the Lorentz force. The deflected carriers gather on both sides to form a potential difference. This potential difference is the Hall voltage.

Use a picture to describe this process as follows:

This picture was found on the Internet. It is very intuitive and shows the direction of the carrier movement and the formation of the Hall voltage at a glance.

At the same time, we can also intuitively see through this that the Hall sensor needs to be powered, otherwise it will not work.

Many friends may not care about this, so we emphasize it a little bit.

The accumulation of carriers can generate Hall voltage, but the generated voltage is very small, and there is no way to directly apply it. Some amplifier circuits must be added for amplification before it can be used. As for how to design the amplifying circuit is beyond the scope of this article, we will not repeat it.

However, it should be noted that the Hall sensor with amplified design can output digital signals, which is what we often call the high and low level state, which is also the most widely used one.

Our company also has Hall Effect Sensor on sale, welcome to contact us.


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