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Metal Heatsinking for SMPS transformers suffers eddy current losses?

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Flyback

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Hello,
We have a 3kw offline battery charger which we bought and they keep stopping working.
We therefore took it apart, and we noticed a 3kW LLC converter using a transformer of Epcos PQ35/35 dimensions and shape. (yes, it was really THAT small!)
Anyway, this transformer is thermally coupled to a 5mm thick aluminium plate heatsink as in the attached diagram.
Surely having a metal plate close to the open side of a high frequency transformer (the PQ35/35 core is not shielded) is going to result in too much eddy current heating in the aluminium heatsink?

Epcos Ferrite databook shows PQ35/35 core on page 281:
http://en.tdk.eu/blob/519704/download/2/ferrites-and-accessories-data-book-130501.pdf
 

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crutschow

Well-Known Member
Most Helpful Member
It would only be the leakage flux that would cause eddy currents, and I would think that would be fairly small.
 
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