EMI filter design problem

[theasus]

emi filter design

I want to calculate the value of this EMI filter;(input,output capacitor and inductance of coil.
Line voltage 220 V 50 Hz and maximum current which is needed for my circuit is 3A. Could you give any formulas?

 

[eem2am]

emi filter circuits design

i cant open it to see if its common mode filter inductor or not.

if its common mode then good luck cuzz no way of really finding it and its just by experience cuzz who knows how much stray coupling there is in yor cct.

you can try and be clever with filter attenuation formulas, say like the butterworth one...and get say 40dB attenuation at the switching frequency.

the caps wont be able to be very big though at high voltage