Re: CCFL transformer

On 25/04/2024 5:56 pm, Klaus Vestergaard Kragelund wrote:

On 24-04-2024 07:10, Bill Sloman wrote:

On 24/04/2024 12:25 pm, John Larkin 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
step-up 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....

>
Can you use a C-W multiplier?
>
For low current, you can do resonant tricks too.

>
It's easier to use a voltage doubler or tripler that it is to find a multi-section former off-the shelf. The occasional high voltage power supply that I've dismantled clearly used proprietary formers, as do the Coilcraft parts
>

 I am using it for pulse generation, so cannot use a capacitive doubler
 

I suppose one could use self-bonding wire to make a series of self-supporting pancake windings, but I've never heard of anybody doing it.
>

Yeah, sounds like difficult to do in production.

You could print a bunch of them - pairs would be nice for both legs of the transformer - mount them on a mother board, and feed the U core halves through the array.
Mechanical stability would be dire, but you could glue on a supporting structure.
Still messy to put together, but 3.5kV is always difficult to handle.
--
Bill Sloman, Sydney