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Re: [TCML] Ribbon Primary - What size?



On 12/18/14, 10:22 PM, Carl wrote:
Hey--

There's also an effect similar to the skin effect that pushes the
current toward the edges of the strip.  I don't know how to calculate
it, but as a guess I would make the strip 1.5x or 1.7x wider that a
calculation with an even current distribution would give.  The best idea
is to use Litz wire, but that would put you in the rarefied atmosphere
of the truly hard core.

---


Google "skin depth calculator".. I use the one at Microwaves101.com

But, 8 mils (0.008") for copper at 100 kHz. Skin depth goes down as the square root of frequency, so at 300kHz it's 0.0046" (.008/sqrt(3))

I think Litz wire wouldn't be very cost effective. You could probably get a lower AC resistance, cheaper, by just going to a flat ribbon rather than a round wire or tube.



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