Hi Bert,
I am looking at a Delta/Delta fullwave system schematic now (the primary
should not be a concern). I see that a - Ground potential leg is derived by
the cathode side of the diode strings. This is a most excellent idea! Now I
would not need to reduce much voltage at the variacs to produce a DC 6P 2x
resonance rise output of sane voltages! It is my intention to use 24" long
center tapped for phase legs 1.5" wide .125" G10,FR4 with > (80) UF5408
diodes each per string configured with eyelets and a saw-tooth looking
cathode to anode pattern. All (3) tops and bottoms joined for ^P plus and
minus. These diodes are rated 3 amps. I can only hope a diode would fail
shorted. With a high current that may not matter! Conventional wisdom is to
de-rate maximums by 50%. This should do it, although the diode eyelets would
be separated by 5/16" from one edge to the other under oil for a distance of
20" or so (7.5" overall). I have some concern about a flashover avalanche.
But the gaps are well distributed and balanced over that distance. If that
is in question I can always get more G10. Thoughts on that anyone? Thanks
Bert for germinating such an excellent seed and solution!
Jim Mora
I think a discussion of the Dequeing "diode" is fodder for another thread!
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Bert Hickman
Sent: Monday, July 07, 2014 11:39 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Was: Raytheon turns ratio too high for sane resonant
charging, Now: more reasonabe 50:1
Hi Jim,
Since you now have access to all the secondary leads, one option would
be to reconfigure your power supply using the existing wye (or star)
primary, and convert the secondary to delta configuration. If the
original wye-connected secondary could deliver 24 kVDC, changing the
secondary to a delta connection will result in an output that is
1/sqrt(3) times the original output, or about 58% of the original
output. The revised output will be 0.58*24 kV or about 14 kV. You can
then connect six diode strings to create a FWB DC output. This is now
in a reasonable voltage range for either direct operation or 2X tank cap
voltage multiplication using either resonant charging or a
charge-reversing (Steve Young) gap. This configuration will also provide
you with 58% higher output current (for the same transformer kVA output).
Bert
--
Bert Hickman
Stoneridge Engineering
http://www.capturedlightning.com
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