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Basic knowledge of power line filter

Views: 24     Author: Site Editor     Publish Time: 2020-09-05      Origin: Site


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Basic knowledge of power line filter


It is a ability to control the leakage of radiation from machines that prevent interference with other normal equipments.

Differential mode& Common Mode:

There are common mode and differential mode interference in the two incoming lines of switching power supply. The interference signal and direction on the two incoming lines are same in common mode, like  figure 1. But the differential mode interference is opposite, like figure 2.



Power line filter:

As there are two kinds of interference signals on the two incoming lines of switching power supply, so the power line filter must be able to suppress both the common mode and differential mode. Figure 3 is a common circuit of power filter. L1L2C1 can remove differential mode interference, L3C2C3 can remove common mode interference.




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