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.
I read about this sstc type on some old tesla coilers blogs. I wanted to know What made them different from a vanilla sstc & why does no one make them anymore???
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
|)4+80!|-|\\/ ( I wonder what you are trying to say with your nic)
The OLTC was a classic disruptive TC, with a twist: The sparkgap was replaced with an IGBT Brick. Another characteristic of the coil was it's low initial voltage on the primary capacitor. By using a resonant charging scheme with a series inductor and rectified power from between 2 phases of 400V AC, (which is the standard here in most of europe) the first bang could be delivered at 560V and all the following bangs in a burst would be delivered at 1120V. It follows that to get proper bang energy, the primary capacitor had to be large and thus, the primary coil very small. 1 and 2 turn primary coils were the norm. Steve Conner made a very elaborate driver for the OLTC, and one of these coils is still in operation at Danfoss Universe 12 years after, so it i a very reliable topology. Another iteration of the topology was the merge of the brick "spark gap" and the Sidac gate drive topology, which Terry Fritz ideated. This author merged these two topologies together with a trigger circuit for the Sidacs, and the T-BRISG coil was born. This topology was used in the V-Twin coil that was on show at Palais de Tokyo in Paris about 8 years ago. This is the last coil of its kind that I am aware of, but I don't know for sure. So, why are nobody building these kinds of coils anymore? I think it is because the primary circuit needs a heavy hand and some rather thick copper to make the coil work. My coils had primarys made from 2.5mm thick copper strap, 50mm wide, and all in all, it was not trivial to make the stray inductance small enough in relation to the coupled inductance in the coil. It is a mechanical problem, I think. But why don't you go ahead and build one, resurrect the old dinosaur! It is almost impossible to kill, unlike it's more recent counterparts, which frequently blow up without apparant cause.....
|)4+80!|-|\\/ ( I wonder what you are trying to say with your nic)
It says DatBoiHV in UlTIMATE LEET(#ImSoEdgy)
By using a resonant charging scheme with a series inductor and rectified power from between 2 phases of 400V AC, (which is the standard here in most of europe) the first bang could be delivered at 560V and all the following bangs in a burst would be delivered at 1120V. It follows that to get proper bang energy, the primary capacitor had to be large and thus, the primary coil very small. 1 and 2 turn primary coils were the norm.
Correct me if I'm wrong but,won't this topology be much more powerful than the standard half bridge or full bridge SSTC's built nowadays??
But why don't you go ahead and build one, resurrect the old dinosaur! It is almost impossible to kill, unlike it's more recent counterparts, which frequently blow up without apparant cause.....
AW HELL NAW I'm in the process of making my first SSTC & am a complete newbie at building tesla coils or HV projects in general.
Maybe Someday....
Steve Conner made a very elaborate driver for the OLTC, and one of these coils is still in operation at Danfoss Universe 12 years after, so it i a very reliable topology. Another iteration of the topology was the merge of the brick "spark gap" and the Sidac gate drive topology, which Terry Fritz ideated. This author merged these two topologies together with a trigger circuit for the Sidacs, and the T-BRISG coil was born. This topology was used in the V-Twin coil that was on show at Palais de Tokyo in Paris about 8 years ago.
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.
About OLTC's
