Hi Carel,
Take a look at CREE.
http://www.cree.com/products/power_docs2.asp
I'm using a phase modulation scheme at 100 KHz.
And am currently investigating, at low power (250 watts), 192 KHz.
73 & Good morning,
Marv WC6W
http://wc6w.50webs.com?
--- On Thu, 3/12/09, pc5m, Carel <pc5m@xs4all.nl> wrote:
> From: pc5m, Carel <pc5m@xs4all.nl>
> Subject: Re: [Amps] HV PS transformer
> To: amps@contesting.com
> Date: Thursday, March 12, 2009, 1:12 AM
> Hi Marv,
>
> Do you remember which kind/type of rectifier diodes you
> have been using ?
> Did do some research and found some ultra-fast diode's
> (trr < 30ns) with
> decent reverse voltage (600V), but would be interested in
> your experience
> ? Suppose the "chopping" freq of the SMPS would
> be in the moderate range
> of 10-40 KHz ?
>
> Thanks, Carel.
> >
> > Hi Paul,
> > I conjured up a simple solution for winding that
> style of transformer a
> > while back.
> >
> > "Standard" Teflon isulated wire is
> typically rated for 600 volts. The
> > 3KV rated stuff is too thick.
> >
> > Instead, run two #22 teflon insulated wires
> through some #12 teflon
> > tubing. Then, parallel as many of these assemblies as
> necessary for
> > the required secondary voltage and feed them all
> through tubular
> > copper braid which will become the primary. A piece
> of woven
> > fiberglass tubing, typically used in under the hood
> automotive wiring,
> > over the outside completes the assembly.
> >
> > This single cable is then wound around the core(s).
> >
> > I connect the pair of wires from each teflon tube in
> series; then to
> > individual 1KV fast diode bridges.
> >
> > These bridges are then connected together to create
> the output voltage.
> >
> > With 380 volts on the primary, 8 secondary runs (4
> tubes) are good for
> > 3KV.
> >
> > The only disadvantage of this scheme is that all the
> extra insulation
> > does need more core window area than would typically
> be required.
> >
> > Incidently, that '91 QEX article is overly heavy
> on the core side. A
> > few more primary turns will greatly reduce the core
> cross section
> > requirement. At these frequencies and power levels,
> almost any core of
> > the correct material and large enough to accomodate
> the windings will be
> > adequate.
> >
> > 73 & Good afternoon,
> > Marv WC6W
> >
> > http://wc6w.50webs.com/
> >
> >
> >
> >
> > --- On Wed, 3/11/09, Paul Decker
> <kg7hf@comcast.net> wrote:
> >
> >> From: Paul Decker <kg7hf@comcast.net>
> >> Subject: [Amps] HV PS transformer
> >> To: amps@contesting.com
> >> Date: Wednesday, March 11, 2009, 9:02 AM
> >> GM gents,
> >>
> >>
> >> Part of my (3cx800A7) amplifier project is to do
> something
> >> "new". Well OK, it's old, but new
> to me.
> >>
> >>
> >>
> >> I'm trying to reproduce the switch mode power
> supply
> >>
>
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