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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> *
>
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