Offline Flyback with shorted out ferrite beads fails EMC standard?

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Flyback

Well-Known Member
Hi,
The attached (PDF schem and LTspice sim) is a basic version of an Offline 120W flyback schematic that has been prototype designed by a consultancy (VAC input = 190-270VAC).
You may assume it has passed EMC radiated and conducted.
The three Ferrite beads shown have gone obselete.
Supposing they were all replaced by shorting wire links, then what standard, at what frequency, would you expect to see an EMC failure?

Ferrite bead now obselete BL02RN2R1M2B...
 

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  • Offline Flyback with ferrite beads_1.asc
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  • Offline Flyback with ferrite beads_1.pdf
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You might want to try a common mode choke on the input and output lines ? Might be able to put them both on one core ?

Hard to find parts these days even if the aren't obsolete !

boB
 
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