I would be very interested to know where the original author got his Schottky
diodes for
this psu as I have been lately perusing all the manufacturers data for such
animals. The
highest voltage types I could find stopped at circa 100V PIV?
John ZS5JF
ps Sorry this reply is so late but had a 2 week break in Europe.
----------
> From: Carsten Groen <cgroen@image.dk>
> To: Radio WC6W <wc6w@juno.com>
> Cc: amps@contesting.com
> Subject: RE: [AMPS] SMPS a la QEX
To: <amps@contesting.com>
> Date: 16 June 1999 10:36
>
>
> Hi Marv et all.....
>
> The QEX article about the SMPS, uses a very simple "controller"
> a CMOS 4001 coupled as a square wave oscillator, driving a couple
> of MJE200/MJE210, which then drives 4 small transformers
> (to get some galvanic isolation). The 4 transformers (some
> small FB-77-6301 toroids) then drives each a FET. The FETS
> suggested by the author is IXYS IXFH21N45, ie 21 Amps 450 Volts.
> The FETS are running the output transformer in a H configuration.
> The output transformer is made of 10 FT193 toroids, with the
> primary made of some copper pipes, 3/8 " inside diameter, the
> secondary are wound thru the pipes, and is made of some #12
> PTFE insulated wire.
>
> There are no PWM regulating/no feedback, just a simple switcher !
> The author, W9QQ, has had the design running for "several" months,
> (that was in feb 1991) in a dual 3CX800 HF amp. He says in the article
> that the output voltage stays within 50 V going from 50 mA to 1 Amp.
> Ripple is less than 1 Vpp.... he says.
> He uses a FWB and 5100 uF at the input, and some schottky diodes
> at the output, and a 6.8 nF/10KV capacitor at the output.
>
> This was a short extract of the article.
>
> This is a VERY easy and simple construction !
>
> Carsten OZ9AAR
> http://www.magicio.com/cgroen
> mailto:cgroen@image.dk
>
>
> > -----Original Message-----
> > From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
> > Behalf Of Radio WC6W
> > Sent: 16. juni 1999 18:46
> > To: amps@contesting.com
> > Subject: Re: [AMPS] SMPS a la QEX
> >
> >
> >
> >
> > On Tue, 15 Jun 1999 22:09:24 +0200 "Carsten Groen" <cgroen@image.dk>
> > writes:
> > >
> > >Hi.
> > >With all this talk about SMPS designs, have any of
> > >you seen/tried the design from QEX Feb/1991 ?
> > >
> > >I have now gathered the parts, Transformer, IXYS FET's
> > >FET drivers, and a appropriate controller IC (unitrode)
> > >for a "prototype", up to 3KW. The thing will be 3 phase
> > >instead of the original 1 phase design. Because of
> > >the 3 phase, I'am using only 1100 uF on the input side.
> > >
> > >Any comments ?
> > >
> >
> > Hi Carsten,
> > I haven't seen that QEX article...
> >
> > Just curious... which controller chip and Power FET's does it use?
> > at what frequency?? and what topology???
> >
> > 73,
> > Marv WC6W
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > *
> >
> > ___________________________________________________________________
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