Re: Loosely coupled transformer windings

John Popelish <jpopelish@xxxxxxxx> writes:

Steve Carroll wrote:

I thought I had the concepts right, but just wanted to be sure. I've
wound my share of simple inductors in the past, but nothing like this. I
like your lateral thinking - a bar across a toroid.

There are lots of other possibilities, also. Keep in mind that the
top and bottom bar in your drawing are essentially equi-potential
(from a magnetic field standpoint) nodes, so the ordering of the
parallel branches is not very important. The flux shunt could be on
either side of either the primary or secondary branches. It doesn't
need to be between them. Think E cores with center or one leg ground
off to make a gap. There are E core shapes made that have all 3 legs
the same cross sectional area for this purpose. And, of course, you
could add an external inductor in series with a tightly coupled
secondary and get a very similar effect.

Or a capacitor - as used in CCFL inverters.

--

John Devereux
.

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