#028 EMI Suppression ~ Mechanism of generating common mode noise (1) Mode conversion ~

Following #015 EMI Suppression ~What is common mode and normal mode?~, we will talk about a mechanism of generating common mode noise.

The relationship in which an entire send current propagating a line returns through a load and a counterpart line is called normal mode. However, due to an impedance (inductance component) formed on the return path, as shown in the figure, some currents that could not flow in the return line will flow out to a lower impedance path.

This part of the current that has no sending and return relationship on a pair of lines is called a common mode current.




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