Re: CCFL transformer

On 26/04/2024 7:40 am, John Larkin wrote:

On Thu, 25 Apr 2024 21:10:14 -0000 (UTC), Jasen Betts
<usenet@revmaps.no-ip.org> wrote:
 

On 2024-04-25, legg <legg@nospam.magma.ca> wrote:

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'.

>
I see trandformers claimed for 15kV with 6 sections of loose wound
magnet wire.  This is however Chinese consumer marketing kilovolts.
>
https://www.aliexpress.com/item/1005002225061453.html
>
Given the ~2mm spark gap it suggests something less than 15kV

 How dinky. This one is 400 KV.
 https://www.amazon.com/AEDIKO-Voltage-Generator-400000V-Transformer/dp/B09L18GG2Z

If you believe that, you will believe anything. This looks like the usual bankrupt stock retailer - they get stuff they don't know much about from businesses that have gone bust, and try to sell it.
--
Bill Sloman, Sydney