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From: Kevin McMurtrie
Subject: Re: 8KW DC buck-converter
User-Agent: MT-NewsWatcher/3.2 (PPC Mac OS X)
Date: Sat, 04 Jan 2003 02:16:25 GMT
NNTP-Posting-Date: Fri, 03 Jan 2003 18:16:25 PST
In article <firstname.lastname@example.org>,
email@example.com (Jon Starr) wrote:
>I have recently had the good fortune to acquire an 'Innova 90' krypton
>ion laser, but my problem is that this beast wants ~35 Amps at 208V!
>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
>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.
>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
It looks like 208V three phase is the requirements of its power supply
box, not the tube.
If it is the tube, maybe a magnetic amplifier on the rectified AC that
tries to maintain a constant voltage drop across a linear current
regulator? Connect it to the laser's coolant :)
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