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From: legg <legg@nospam.magma.ca>
Newsgroups: sci.electronics.design
Subject: Re: CCFL transformer
Date: Thu, 25 Apr 2024 10:52:51 -0400
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On Wed, 24 Apr 2024 01:57:36 +0200, Klaus Vestergaard Kragelund
<klauskvik@hotmail.com> wrote:

>Hi
>
>I need a low distributed capacitance winding transformer, for a HV 
>stepup function (3.5kV)
>
>I am zeroing in on similar concept as CCFL transformers with 
>sectionalized bobbin.
>
>For example:
>
>https://www.coilcraft.com/en-us/products/transformers/power-transformers/ccfl-transformers/fl/
>
>Possibly using Triple Insulated Wire to create some distance between the 
>individual turns.
>
>Not many sells CCFLs these days.
>
>Guess I will keep it alive....
>
>Regards
>
>Klaus

Stress between turns is limited by v/n limit of core. It's layer
stress and section stress that you have to deal with.
That's what the multisection bobbin and pancake windings do.

If the CCFL transformer will allow only 1600V, imagine the 
precautions required for 3x that stress. I'm not sure you 
can avoid vacuum impregnation / potting in anything 'small'.

RL