"Magnetics" may have adequate cores.  http://www.mag-inc.com/   Look at
their catalog, and you will see various calculations.  The standard "WaAc"
calculations are useful, but not definitive--with air cooling, you can put
more current through the copper than you could otherwise.  If you do use
100kHz, you will definitely need to pay attention to things like "skin
effect" as well--the copper losses will be significant, unless you use thin
foil.

I'd be interested to find what you're using to drive this thing:  the
devices we use for a similar application are big and not cheap.

Of course, you could always hire someone to design something like this.   If
you're rich enough to buy a few thousand, I'm sure that "Electronic
Craftsmen" (my division's parent company) would be happy to help you.

Jason Neudorf
Microcontroller Specialist
Power Vector (a division of Electronic Craftsmen)

----- Original Message -----
From: "Justin Grimm" <Justin.Grimm@SOUTHCORP.COM.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, August 21, 2002 11:30 AM
Subject: Re: [EE]: How to make a transformer


> The input is a push pull arrangement so there will be 24 v at any time on
> the input.
>
> Justin
>
> -----Original Message-----
> From: Thomas Sefranek [mailto:tcs@cmcorp.com]
> Sent: Thursday, 22 August 2002 0:00
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: How to make a transformer
>
>
> You are NOT up to the task if you have to ask.
> Designing a 3,000 watt inverter, is a NON-trivial task.
> Finding a core that can handle that gauss will be a daunting challange.
> BTW: 48 volts times 18 is NOT 432 volts.
> Trying to wind a 50 AMP primary is a good challange too.
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Justin Grimm
> > Sent: Wednesday, August 21, 2002 9:33 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [EE]: How to make a transformer
> >
> >
> > hi everyone
> > Does anyone know (or know where to get info) on how to design an
inverter
> > transformer?
> > Its input is 24-0-24 V square wave 100kHz or 20kHz (havn't decided yet)
> > Its outputs are- 1x 432 V at 2400W
> > and 1x 12 V at 6W.
> > The turns ratio is 1:18. Do I use a ferrite core? It needs to be
> > as small as
> > possible.
> >
> > How do I design this transformer?
> >
> > Thanks
> > Justin G
> >
> > --
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> >
> >
>
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