Author Topic: Litz Wire?  (Read 182 times)

Offline abstruse1

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Litz Wire?
« on: May 10, 2022, 03:16:29 AM »
I've read that Litz wire conducts high frequency much better (lower resistance, I assume) than traditional wire diameters.  Has anyone had any experience using Litz for the primaries of flybacks?
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Offline Mads Barnkob

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Re: Litz Wire?
« Reply #1 on: May 10, 2022, 09:29:19 AM »
Litz wire is "better" in the way that you can utilize the entire copper conductor at your given frequency. Using a single wire, the skin depth of the current, will at higher frequencies not penetrate the conductor completely, so you are "wasting" material in the middle of the conductor as its not conducting any current. It can however help dissipate or lead away heat or supply mechanical strength.

The Litz is made up of individual insulated wires, thus each is their own conductor in respect to the other wires in the bundle. In this configuration you can select a Litz wire that suits your freqency, in order to obtain 100% current penetration.

I wrote about skin depth in a easy to understand way here: https://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/busbar-and-primary-circuit/ Scroll down a bit.

I have used litz wire for flyback primaries, but for short runs like in experiments, normal machine tool wire will work just fine. It is not a problem for me if it gets hot to touch, as long as the insulation does not melt.
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Offline abstruse1

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Re: Litz Wire?
« Reply #2 on: May 11, 2022, 04:00:41 AM »
So, Mads, do you think Litz primary wire will transfer more of the power (current or voltage) from the driver than solid wire?
Abstruse1
   Been working with electricity for 60 years and still getting a tingle!

Offline Mads Barnkob

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Re: Litz Wire?
« Reply #3 on: May 11, 2022, 08:45:57 PM »
So, Mads, do you think Litz primary wire will transfer more of the power (current or voltage) from the driver than solid wire?

There can only be a difference in terms of heat losses, so if the solid wire primary does not get too hot to touch, then the difference will be miniscule.
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Re: Litz Wire?
« Reply #3 on: May 11, 2022, 08:45:57 PM »

 


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