Author Topic: Secondary Coil, what wire diameter ?  (Read 374 times)

Offline Mathieu thm

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Secondary Coil, what wire diameter ?
« on: December 04, 2022, 06:26:53 PM »
Hello everyone,

I'm starting to think about doing a DRSSTC with a 160mm secondary, I read Mads' page on secondary coils and I saw that for a 160mm secondary, 0.4mm - 0.45mm wire is fine, and that below 0.35mm the impedance was getting too big.



On the Kaizer DRSSTC I, the secondary coil (160mm) is made with 0.25mm wire, why did he make this choice ?



I have a 0.25mm wire spool but I don't know if it's too small for a 160mm secondary coil.

I'm thinking of making a 160mm x 650mm secondary with 0.4mm wire, I wanted to know your opinion, for this secondary size, if 0.4mm wire is a good choice.






« Last Edit: December 04, 2022, 06:34:50 PM by mthome4 »
Mathieu Thomé

Offline Mads Barnkob

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Re: Secondary Coil, what wire diameter ?
« Reply #1 on: December 04, 2022, 06:36:48 PM »
Hi Mathieu

Well, I knew that i would regret making those calculations with coloring around the "magic 50k", since it can be deceiving. There is no universal truth, but the guide gives hints on how to make something that works good. It is not going into experimental territory.

Now... why did i choose 0.4 mm. Because that was the wire I could buy in Denmark where a small spool of 1kg was enough windings :) It was chosen from a economic point of view.

Unless you are grossly away from 50k impedance, like under 25k or over 100k, it will work within the frame of "high impedance needs long on-time and low impedance works with short on-time (high peak current, more expensive components needed)"
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Offline Mathieu thm

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Re: Secondary Coil, what wire diameter ?
« Reply #2 on: December 04, 2022, 07:01:46 PM »
Quote
Hi Mathieu

Well, I knew that i would regret making those calculations with coloring around the "magic 50k", since it can be deceiving. There is no universal truth, but the guide gives hints on how to make something that works good. It is not going into experimental territory.

Now... why did i choose 0.4 mm. Because that was the wire I could buy in Denmark where a small spool of 1kg was enough windings :) It was chosen from a economic point of view.

Unless you are grossly away from 50k impedance, like under 25k or over 100k, it will work within the frame of "high impedance needs long on-time and low impedance works with short on-time (high peak current, more expensive components needed)"

Thank you for the answer !

I'm not sure yet but I'm finally thinking of using 0.315mm wire to have a lower resonance frequency than with 0.4mm wire, it will relieve the IGBTs which will surely be CM300

Mathieu Thomé

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Re: Secondary Coil, what wire diameter ?
« Reply #2 on: December 04, 2022, 07:01:46 PM »

 


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