How to cool down an SMPS transformer?

[eem2am]

if an smps transformer is heating up too much....

What are the measures that you can take to get it cooler..?

is it the following?...

1. Check winding resistance is not too high
2. Check the ferrtite material is the correct one for the switching frequency being used.
3. Check the delta(B) ...i.e. check the AC flux density is not too high.
4. Check that the core has enough surface area to cool off from.
5. Check that the core is big enough
6. Check that saturation is not occurring.
7. Check that airflow from fan (if used) is sufficient

is there anything else that could be done to achieve a cooler running SMPS transformer?

 

[Orson Cart]

Yes - that is a good checklist, assuming there is no gap in the ferrite transformer the only other thing would be to look at whether the wire being used is appropriate for the frequency the Tx is being driven at, for moderate to large currents foil or litz wire is almost the only way to reduce AC wire heating (for frequencies above 35kHz approx).

If the transformer is gapped (as in a flyback) the geometry of the wingings is important so that stray field does not heat the innermost windings.
Regards, Orson Cart.