If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Hi I have to make stable, long demo run SSTC (SSTC have to run, until secondary become hot).
To make that, i buy large heatsink (it can eradiate 100W heat without fan), so my fets will be just warm. Heatsink is large surface area madded from 1,2kg aluminum)
Also i decided to use diode blocking system (some high power schottky and 15ETX06 diode (18ns 15A).It will be full-bridge with IRFPS40N50L mosfets.
For driver, i think use PLL, will high power GDT driver (CT>PLL>UCC>ultrafast fets>GDT) Secondary will be 0,1mm wire 8cm diameter 33cm tall does any one have idea, how to make it more stable ? i
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
If heating in the secondary is your major concern, add a fan at the bottom to cool up through the secondary tube, just remember large holes under the topload :)
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Overheating of the secondary, especially around the base, is the major issue. On my wireless power demonstration coil I used PVC tube for the secondary form and this limits the run time to few minutes at most.
A secondary that is intended to run for prolonged periods of time should definitely be wound on something more heat resistant (fiberglass, teflon, phenolic/bakelite), still combined with forced air cooling.
If that isn't enough, more extreme alternatives could be active oil cooling (using a plexiglas tube around the secondary and a motorcycle radiator) or making the secondary a skeleton-coil and blowing air through it.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
MadsKaizer wrote ...
Linas wrote ...
maybe i will fill all secondary by epoxy glue, and that will help keep secondary warm some time...
wait... what...
Well, if you use thermally conductive materials, it will effectively increase surface area, like a heatsink. I have a stereo transformer that is potted with some very hard thermally conductive material, for heat dissipation. The highest voltage internally is 120v, so there is no need for electrical isolation. Though, i dont know anything about epoxy glue.
As Dr. Gigavolt said, forced air cooling would probably be sufficient. If not, i rather like the idea of the skeleton former. I have thought about using this before. And that with forced air cooling should make a cold coil. As long as you are not going for sparks longer than the secondary...
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Just use forced air cooling. This will cool your secondary very effectively. better yet put a fan bellow the ciol and blow it up through the tube and outside
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Just a floor fan pointed at the windings is good enough (or a muffin fan)
There is very low thermal mass of the windings and the air will curve right around the secondary and cool it quite effectively. For best results, use minimal (or no) coating over the secondary)
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Long run sstc
