On Fri, 12 Aug 2011 12:27:10 -0400, "Josepi"
wrote:

I always just assumed it was too expensive but was much better (less
losses). Any reasons for that known?

1-----------------
wrote in message ...
Ferrite's no good for 60hz and any kind of power.


The maximum working flux density of ferrite is only about 1/3 of
that for silicon iron. A ferrite 50/60Hz power transformer would
be more than 3 times bigger than the silicon iron equivalent

However the high frequency losses are much lower and at
frequencies higher than a few thousand Hz ferrite design are
smaller and more efficient.

High power designs are common in the frequency range a few
hundred KHz to a few MHz

Jim