Flyback core losses are less than woudl think

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cupoftea

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Hi,
Supposing an Offline Flyback has a Bpk of 300mT.....then the peak B for the core loss charts is half that, ie 0.15T.
But due to remnance, would you agree that its actually some 20% less than that?

(..the remnance residual magnetic flux "loitering" there , unlike in a Bridge type SMPS, where the flux is bipolar.)
 

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you have not stated what you think the remanance is for the material you have in mind.

For 300mT peak the ac flux is 150mT peak - but there will be some extra ( anomalous ) losses due to running close to saturation ...
 
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