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From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com>
Newsgroups: sci.electronics.design
Subject: Re: CCFL transformer
Date: Thu, 25 Apr 2024 14:40:18 -0700
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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