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Subject: Re: 8KW DC buck-converter
Date: Sat, 04 Jan 2003 01:08:36 +0100
NNTP-Posting-Date: Sat, 04 Jan 2003 01:08:36 MET
Jon Starr wrote:
> I live in 230V land so I don't need to bother with the trouble of a
> boost system but I still have to make a supply that will allow me to
> vary the current from about 15A to 35A at 208V (as far as I can make
> out the plasma looks like almost a dead short to DC, but there is also
> the plasma-compression solenoid in series with the tube so that helps
> with ballasting).
The tube may have negative resistance itself. Gven that the coil is in series
this will not be the case for teh whole.
> I have done a (very) little bit with IGBT buck-converters but only at
> the very low current/voltage range, so if anyone could help me with
> regards to the extra considerations needed at this kind of power I
> would be very grateful, most specifically I want to minimise the
> current peaks from the mains (single phase) so I need some sort of
> slew rate limiting I assume.
You want high slew rate, and run the converter in a kind of constant current mode.
On the input side you filter to prevent mains pollution.
> Also does anyone know of any high-current schematics available on the
> web, the current doesn't really matter as long as it is above the
> general pack, I just want to make to make sure I'm on the right lines
> with the design I'm doing as I don't want to melt my laser through an
This is a hard thing to build!
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