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Mains Filter

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A mains filter reduces interference between the device and mains lines. That means it prevents noise coupling from the mains line into the device (increasing immunity) and vice versa (decreasing emissions).

To filter both common mode and differential mode noise, a common mode choke is supplemented with X and Y capacitors. The bandwidth of the filter can be increased by adding a second choke with a different core material.

An overvoltage protection and a fuse should be placed at the input stage of the filter.


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