Re: DC power supply again
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Sunday, August 24, 1997 3:34 PM
Subject: Re: DC power supply again
Hi John, all,
I'm not one to extrapolate too wildly but here's
something to chew over:
> From: FutureT-at-aol-dot-com[SMTP:FutureT-at-aol-dot-com]
> Sent: Wednesday, August 20, 1997 3:01 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: DC power supply again
> In a message dated 97-08-20 00:52:19 EDT, you write:
> << Based on my analysis that wallplug to primary cap is the biggest
> > loser in a number of systems, I have decided on a completely
> > different approach. I am currently designing an off-line flyback
> > switcher to run at the 2kW+ level. What I am looking for:
> > - efficiency in the supply of around 80 - 85%
> > - being able to use any size cap without having to deal with primary
> > charging resonances
> > - good gap quenching. I am looking at using optical feedback from the
> > gap to shut the supply down if necessary although that is
> > peripheral to getting the supply up and running. Experiments
> > suggest that with this type of supply, quenching is solely dependent
> > on output discharges anyway.
> > - continuously variable power setting. Break rate is obviously
> > dependent on gap and power setting.
> > - Max output of 20kVDC
> > - No smoothing cap required. The supply charges Cp raw.
> > - Incorporation of power factor correction by using the input
> > haversine to modulate the internal reference (not yet tested).
> > I designed the transformer several weeks ago and am looking at core
> > losses of around 90W, hoping to achieve the same or better in the
> > windings (difficult given the winding window I will have to live with)
> >and hopefully switch losses of the same order. Please don't bombard
> > me with "how's it going". I am currently suffering financially and
> > time to completion is indeterminate at this stage. I see this as a
> > real future to running efficient low to medium powered systems. I
> > have been using the minicoils and supply as a development tool to
> > mature this technology and have tested a number of designs in order
> > to arrive at a well behaved one that is scalable to the kW range.
> > I would like to stress that these ideas are (now) public domain
> > and may not be copyrighted or patented.
> > Malcolm
> > (in near poverty).
> If there's anyone who can tame the "DC beast", it will be you. I
> suspected you were planning something like this...based on the
> hints you gave recently. It is certainly possible that this method
> will overcome the usual DC problems, and the AC ones to boot!
> I wish you the best of luck both with this work, and financially too.
> Thanks for sharing your DC power supply ideas.
Thanks. My coil here at work: Sucks about 1.6kW from the wall when
throwing arcs to ground at 4ft+. Ecp x BPS = 270W.
What can I expect?