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 #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
It's not THAT specific part, but the circuit that's inside of it. The zener diode could be changed around with whatever voltage it is you need, and it would work for a small spark gap replacement for solid state telsa coils. It would run the same as a SGTC though.
Just curious if this would work not, among other uses it may have; I.E. Machine gun type coilgun (obviously needs to charge fast) lowish voltage multiplier, (would need DC input, as opposed to AC for a CW),
Plus the SCR can be changed out for whatever it is you need.
Sound like a good idea, or is this full of fail and pain?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The idea that you are presenting is basically an OLTC. The SCR in the part you posted would probably be too slow and weak in terms of peak current rating for this application.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Dr. Kilovolt wrote ...
The idea that you are presenting is basically an OLTC. The SCR in the part you posted would probably be way too slow and weak in terms of peak current rating for this application.
"Not that specific part, but the circuit inside of it"
I just meant the circuit WITHIN it, as an example of it. Not the parts used for it.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The problem is that the circuit uses a resistive current limiting and triggers before the cap voltage reaches mains peak voltage. In an OLTC, the resistor would dissipate huge amounts of heat so you replace it with a charging choke. The result of this is doubled voltage on the resonant cap and the switching device must turn on after the resonant cap charges to its maximum voltage, not before. Also, the circuit is ok when used with a SCR which turns on and stays on until the current drops back to zero, but SCR's are usually way too slow for an OLTC so we use IGBTs. They do not stay turned on like an SCR so we need a different circuit to drive them.
However a somewhat related concept is the SISG - but this again uses IGBTs.
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
The circuit in there functions as an OLTC as Dr. Kilovolt and it also is designed to drive SCRs (which is easy). You'd have to switch out the entire dotted box with other stuff, and then it would be exactly like an OLTC.
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.
This circuit could work for a solid state telsa coil, low part count?
