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PI filter for industrial controller board

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anotherbrick

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hello dear forum ,

I want design a industrial controller board ( PLC like )
the board will run with 24 VDC and max current drawn will be 1 Amper

I will put a PI filter at the power input to suppress unwanted EMI

I will use 2 x 100 nF for caps
I want ask what uH value must be the inductor ?

anyone who can share a practical info ?

thanks
 

Is the power supply a switching DC/DC converter? Are you trying to suppress the switching noise or some source of radiated EMI? Essentially we need to know what frequencies you want to reject before selecting an inductor value. Also make sure to keep the voltage rating of the caps and the DCR of your eventually inductor in mind. If you're driving one amp the voltage drop across and power dissipated by the inductor could start to matter if it has a large resistance.
 
hello thank you

the power supply is a switching regulator 220 VAC / 24 V DC
it is external to my circuit

I want to suppress the parasitic noise coming from the mains
originating from motors and contactors or solenoids when they
switch on and off
 

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