Can Transformer Toroid core be used as EMI core

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dann11

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Hi! I want to design a Common Mode Choke for my PFC circuit and I am looking for an EMI core that I can use for the design. I have seen many transformer toroid cores and only few for EMI suppression core. Can I used the transformer toroid cores as an EMI suppressor core? Or do they have different properties?
 

Should work well, because with a common mode choke the dc cancels out, leaving just the inductive impedance free from any magnetic saturation effect.
 
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    dann11

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