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What is the principle of common-mode inductors to eliminate interference?
Apr 26, 2018

What is the principle of common-mode inductors to eliminate interference?

The two functions of the common-mode inductance exist: one is to eliminate external interference, and the other is to prevent the electromagnetic radiation from radiating itself.

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Do common-mode inductors have two leads, both as inputs? Or do one input, one output? If all are used as input terminals, then the former eliminates external interference because both input terminals are connected to the ground, and the interference current generates an impedance through the inductance of each side, thereby eliminating the interference.


The characteristics of common-mode inductors are DC resistance, AC, and high charge and low discharge. Since we talk about common-mode inductance, it is also inseparable from the differential-mode inductance. Then what can be the difference between common-mode and differential-mode inductance? Find the answer you want.


The two ends of the inductor are generally connected on the same line, there is no positive and negative points, and the two sides are conductive. Applying its features on the principle of anti-jamming through DC resistance, high charge and low discharge, such as at a very stable level Suddenly, there is a high level on the 1st, which will charge the inductor and generate a positive and negative back electromotive force. When the high level goes high, the low-level inductor will discharge to become negative, which will disturb the high level. To eat it.


In this way, the principle is not mentioned, but in the circuit, the inductance is to be combined with other components to form a better circuit and will not be used alone.


1 Gaoping: refers to the logarithm of the ratio of two powers or voltages. It can also be used to represent the logarithm of the ratio of the two currents. The unit of decibel level is expressed in dB. The commonly used levels are power level and voltage level, and they can be divided into two types: absolute level and relative level.

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