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Old 6th Aug 2022, 9:27 am   #26
Ed_Dinning
Dekatron
 
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,162
Default Re: Denco coils substitute

Hi Folks, a lot of this "Litz" wire is actually "bunched" wire where the individual cores are simply grouped together.
It is a lot cheaper than Litz and is 95% as good as Litz, as well as having a slightly lower resistance.
Litz is actually laid up so that each strand occupies every possible position in the layup and will normally be an odd number of strands. (fitting circles inside a bigger circle)
The Bunched wire is typically 25, 50 etc strands
I did quite a bit of work on the use of bunched in SMPS, operating up to 1MHz and found that there was no significant increase in losses below 1 MHz. For higher RF it will still be advantageous.

Ed
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