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What is the difference between common mode inductor and differential mode inductor?
Apr 26, 2018

What is the difference between common mode inductor and differential mode inductor?


The difference between common mode and differential mode inductor?

common mode inductor and differential mode inductor.png


Common mode inductance and differential mode inductance are two commonly used inductance coils, usually in the form of magnetic loop inductance coils, used in the circuit to counter and suppress EMI interference signals. Their composition and materials are similar, but common-mode and differential-mode inductances also differ from each other. What is the difference between common-mode and differential-mode inductances?


The difference between common mode and differential mode inductance is mainly reflected in three aspects:


First, the function difference:

 

Interference between two power lines to ground is called common mode interference, and filter inductance that suppresses common mode interference is called common mode inductance.

The interference between two power lines is called differential mode interference, and the filter inductance that suppresses differential mode interference is called differential mode inductance.

 

Second, winding difference:

 

The common-mode inductance is two sets of coils with the same number of turns around the same core, the same diameter of the wire, and the opposite direction.

The differential mode inductor is a coil wound around a core.

 

Third, the difference between features:

 

The characteristics of common-mode inductors are: Because the two coils on the same core are wound in opposite directions, the core is not afraid of saturation. The most widely used core material on the market is high-ferrite materials.

Differential mode inductors are characterized by their application in high current applications. Due to a coil wound around a core, when the power flowing into the coil increases, the iron core in the coil saturates, so the most used core material on the market is the metal powder core material. Especially iron powder core material (because of cheap price).


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