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IS Litzwire neccessary in AC-Inverter Inductor

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Is Litzwire neccessary in AC-Inverter inductor application at 20kHz

Hello guys,

we are building an AC-Inverter Inductor for 20kHz switching frequency.

As i found out, for the given crosssection of 15mm² the resistance would be 3 times higher than when using a "solid" wire than using 33 to 36 AWG strands litzwire.
But i think this isnt much of a problem because only the ripple current "sees" this higher resistance. So the difference in losses will be only a few Watts when the resistance of the whole coil is only a few milliohms.

Am i correct with this assumption or is it completely wrong?

Best regards
 
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But i think this isnt much of a problem because only the ripple current "sees" this higher resistance.
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Yes, if the ripple current is respectively low. You didn't tell what it is.
 

Its about 10% of nominal current so 5A. If the resistance of the total winding is about 5mohm with termination than the 5A would see 15mohms AC resistance resulting in about 0.4W instead of 0.125W which is absolutely no problem. Is this assumed correctly this way?
 

perfect, thanks for your help.

whioch type of wire would you recommend for a 15mm² total crosssection in terms of single strand diameter? i think going higher than 0.2mm per strand will make the wire very stiff and hard to wind around the core.

i found silicone insulated fibre cables like this https://products.lappgroup.com/typo...2_Product_Picture_1_24f6fb70a0_c8966532f4.jpg

or silicone cables with tinned strands like : https://www.tme.eu/de/Document/8dcd0f6fcd58716087423a33b04a5acd/K_024_SiF_SiFF.pdf


can they be used for inductor windings or are there better alternatives which are in the price range of 5 usd/eur per meter?

Best regards
 

I Assume your using a Ferrite Core for this transformer?
Why not just use a few smaller diameter pieces of Enameled Magnet wire, twisted together to make your own Litz wire?
 

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