RE: DC POWER

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Chris Swinson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <exxos-at-cps-games.co.uk>

Hi Nick,


> Mark Barton, Brian Steinbach and more recently Steve Young all tried the
> SPDT approach, all reported rather poor efficiencies. (and in Mark's case
> some fairly extreme collateral damage as I recall)

Do any of these have a website ?

>
> If you could draw the exact circuit that would be helpful.  My old DC
setup
> had a nasty habit of blowing diodes in the snubber stack unit I added some


FTM my scanner is not working, but some chap yesterday posted a design which
is basically the same, which is at

http://www.mindspring-dot-com/~ottalini/DCCOILS/Dcschema2.jpg

I do however have a smoothing cap 2MFD across the NST DC output.  Where he
has a 10K I have tried a spark gap, resistor, and inductor now. HTH.


> extra protection circuitry.  To both limit the charging current and
prevent
> the voltage reversal blowing out the rectifier you put a large inductance
in
> series with the output of the supply.  However this only _reduces_ the
> kickback, you then need to add a supply snubber network (appropriately
rated
> of course) in between the filter cap and the charging reactor to keep the
> transients out of the filter and shunt them off to ground.  The resonant
> charging approach, using a reactor, is imho the _only_ way to go, if you
> want reasonable efficiency from a DC system.  Suitable charging inductors
> can often be had from old radar systems, as I said Martin is the man to
> speak to.

Yes it might help a bit, though my diodes are running a a bit of a push
really so that don't really help to much.



cheers,
chris



P.S. I tried to send a copy to your mail box  at tcbouk-dot-org.uk though I got
it back with the servers life history so it seems...