As luck would have it, I found that I had (11) each International Rectifier
(PN# - SD300C32C) hockey puck style diodes. However, I had no idea what
their individual rating specs were, so I did a Google search on the their
part number. I could hardly believe my eyes, as these beasts are each rated
for 3200 volts at a whopping 540 amps!
They were sandwiched in series between two 1/2" thick aluminum blocks
pressing them togther with two sticks of 1/4" -20 TPI allthread ran through
HDPE bushing spacers through proper sized holes in the aluminum block
"terminals". These bushing spacers allow for a nut to placed on each end of
the two allthread sticks to press the 11 diodes together and the HDPE
content of these spacers properly insulate the two aluminum block terminals
from each other. I had dismantled this setup before but had the mind to keep
up with all of the "parts" (except the allthread rods - had to go to the
local hardware store this morning) and I put them back together this
morning. I now have what's effectively a "super" D - Q'ing diode that's
rated at 35 kV @ 540 amps!
With the changeover from my previous (8) paralleled 150 kV piV diode
"sticks" from x-ray transformer rectifier assemblies to this beast, it seems
that my D-Q'ing diode progressed from the Achilles Heel to the Ft. Knox of
my DC Res system ;^)
The only thing I fear now is that my little 5 Henry choke may not be able to
withstand the abuse, as it gets noticably warm pretty quickly when I test
fire it by simply shorting the output of the circuit when it is energized
with a 14.4 kV pole transformer that is energized at about 70% of its
rating. Also, my FWB fuse styled rectifiers are showing some noticalbe
warmth above ambient temperature as well when I place this type of abuse on
them. How many of those ~ $2 each 20 kV @ 2 amp rated diodes are you using
for your FWB between your pole pig and the storage caps?
Give all of your Teslafest guests my best tomorrow.
Happy Sparkin',
David
----- Original Message -----
From: "Roger Smith" <rwsmith@xxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, August 11, 2016 11:29 AM
Subject: Re: [TCML] DC Resonant coil Questions
Hi Dave,
Regarding the De-q-ing diode I only know that when I tried a solid state
one once it didn't last any time at all. Maybe if it was put in between
the smoothing capacitors and the charging choke it might work and do some
good that way.
I don't remember what the current draw from the mains was but I,ll
check it when I run it on Saturday and let you know.
Roger
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