[Lowfer] Triflier Core Winding

[Peter Barick]

Thanks to Frank and to John.

John: Yes, I did a search but with a different spelling. Seems others
use it that way too. Did get more hits using the "ar" ending, though.
However, what I found pertained to "usual" trifilar windings, I'm
fimilar with those, but not the type that I mentioned: 

"Why is it used? It seems to be a similar in style to Litz wire, the
forming of a twisted 3-wire conductor and wrapping it on the core,
where
all like ends are tied together. This technique is new for me. . . ."

 That's what I want to know.

Peter
-----------------------------------

>>> w1tag@charter.net 04/10/02 09:31AM >>>
Peter,

Do a Google search on "trifilar winding" (note spelling of trifilar),
and
you'll get all sorts of references.

Bifilar (2 twisted wires), trifilar (3) and quadrifilar (4)
transformers
provide low-loss broadband impedance transformation. The impedance
ratio is
the square of the number of turns in the winding. So you get 4:1 for
bifilar, 9:1 for trifilar, etc.

These are called "transmission line transformers," and generally have
lower
loss and wider bandwidths than conventional primary/secondary
transformers.
They do have higher capacitance between input and output, which might
be a
problem in some applications.

John Andrews, W1TAG