Been there.... Done that... Direct flux linkage between windings,
capacitive coupling, magnetic coupling through the core, funny core
behaviour at RF etc. etc. For a start, google bifilar trifilar
transformer transmission line...
My own limited experience tells me that broadband RF transformers is
black art. Forget about science, just experiment in the dark until it
works :-)
If I had your knowledge of math and programming, I would build a
transformer model in software and write a program, that includes a
database of all known ferrite cores and Litz wire manufacturers, that
takes the wanted performance and maximum price as input and suggest the
best transformer compromise with performance curves as output. Am I
asking too much? See it as a challenge! :-D
Almost joking...
73
Johan SM6LKM
Paul Nicholson wrote:
I find that to get the leakage inductance down low enough
the secondary has to be wound on top of the bifilar
primary. Is that normal? If I space the turns neatly
around the toroid, the leakage inductance is way too
high.
|
