In this space, visitors are invited to post any comments, questions, or skeptical observations about Philo T. Farnsworth's contributions to the field of Nuclear Fusion research.
Subject: Re: Computer control
Date: Apr 12, 5:27 pm
On Apr 12, 5:27 pm, wrote:
>Probably what you want is a constant current supply (more than a constant voltage supply).
Yep, with a good filter to slow transient response. And as I have so often suggested, be prepaired to find RF and microwave negative resistance instability. Computers and control systems don't like RF that resonate circuit board traces to disruptive voltages.
>Perhaps a switching supply would be the way to do this, with a SMALL smoothing inductor (so the dynamic response would be good). At work, I am looking at switching supplies for TWTA's right now (8-10 kV) and I will see if I can scavenge a decent easy to build design.
Ooh, wouldn't that be nice to heat a plasma with?
>In summary, it seems that the tough part is the power supply. Anybody got good ideas on an inexpensive source for the transformers for a HV switching supply in the kilowatt range (say, 50 kV @ 20 mA).
http://www.alliedsignal.com/metglas/hfc/powerlit.htm if you want the best cores. Otherwise you might look at computer switching supply cores in parallel. But with more money than time, get the Metglass.
>Somehow, I don't think a TV flyback's going to cut it...
15 Watts, then you better oil-cool the ferrite.
>(But maybe a bunch of HEI coils in parallel/series?... they are in the 100-200 watt range)
Yep, thats what I had in mind for initial pulse experiments. But I'm considering repetitive pulses, with microwaves to keep the grid plasmas hot.
>Switchers, as a class, live or die by their magnetic components.
You can find free or demo design software on the net, I can look up references if you want.
- Re: Computer control (switching power supplies) - Jim Lux Apr 13, 11:30 am