How to reduce spikes 18dB

Thread Starter

Golz Sharma

Joined Jan 25, 2021
1
Hi I have conducted CE102 Test and the results were not good.
I want to redesign my filter so I can attenuate 20dB at 430 Khz. the switching frequency is 440KHz
Can Anyone help me with the selection of common mode choke and capacitor so I can pass the test
currently I have used 1mH common mode choke and 4.7MFD capacitor.



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Marley

Joined Apr 4, 2016
411
Change the common-mode inductor for one with greater inductance.
Or have two stages of filtering (better).
Also, be very careful with the layout. Keep the input and filter pairs of wires twisted (if wires) or close together (if PCB traces) and separate from each other.
C1, C2, C5, C6 must have low inductance connections to ground without any common impedance. Use a PCB ground plane.
 
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