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Magnetic saturation of the inductor
Jun 13, 2017



Magnetic saturation of the inductor


Magnetic saturation is a physical property of a magnetic material. It means that the magnetic flux passing through the magnetically permeable material cannot be infinitely increased due to the limitation of the physical structure, thereby maintaining a certain number of states.

 

Magnetic saturation is a physical property of a magnetic material. After magnetic saturation is generated, it is harmful in some cases, but sometimes it is beneficial in some cases.

 

For example, the magnetic saturation regulator uses the magnetic saturation characteristics of the core to achieve a stable voltage.

 

The power transformer, if the applied voltage greatly exceeds the rated voltage, the current will increase sharply and the transformer will quickly burn out.

 68μH inductor.png

Suppose there is an electromagnet. When a unit current is applied, the induced magnetic field intensity is 1. When the current is increased to 2, the magnetic induction intensity will increase to 2.3. When the current is 5, the magnetic induction intensity is 7, but the current is At 6 o'clock, the magnetic induction is still 7,

If the current is further increased, the magnetic induction intensity is no longer increased, and at this time, the electromagnet is magnetically saturated.

 

An inductor with a magnetic core has a magnetic saturation problem. A magnetic core with ferrite or other magnetically permeable material in the inductor can take advantage of its high magnetic permeability, increase the inductance, reduce the number of turns, reduce the volume, and improve the efficiency. .

 

However, due to the limitation of the physical structure of the magnetically permeable material, the magnetic flux passing through cannot be increased indefinitely. The magnetic flux passing through a certain volume of magnetically permeable material will not increase until a certain amount, no matter how much you increase the current or the number of turns, the magnetic saturation is achieved. It is.

 

Especially in a circuit with a direct current, if its direct current has saturated the core, the AC component in the current will no longer cause a change in the magnetic flux. The inductor loses its effect.


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