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 #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Linas wrote ...
can you show how you mounted 1000V 2uF snubber's ?
Sure, I decided to use 2 snubbers in parallel for 4uF at 1000V
Also Finn, I believe there are two reasons why my primary current is so low. One the tank impedance is kinda high (12ohm) and also the coupling is high (0.25k) as a result of this I run longer on times at low peak currents, which I personal think is the better way to go, believe it or not currently I am running the CM600s lower than there datasheet rating of 1200A for 1mS. I think that it is better to run the IGBTs with slightly longer pulses at low peak current, my experience with the QCW is what lead me to this conclusion.
Also I am using a single 2 inch OD ferrite core for my GDT to drive all 4 CM600s this gate drive setup is working flawlessly so far, ill have to post some scope shots of the bridge output soon.
This coil also needs more C on the bus currently 2700uF is just not cutting it, we get some voltage sag at higher PW, I plan to double the C on the bus to 5400uF.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Please forgive my ignorance, but why have you put those two large awg black wires through that blue wound toroid? Is that blue toriod for current measurement, or gate drive? Is your two inch diameter gate drive ferrite visible in the above pic?
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Patrick wrote ...
Please forgive my ignorance, but why have you put those two large awg black wires through that blue wound toroid? Is that blue toriod for current measurement, or gate drive? Is your two inch diameter gate drive ferrite visible in the above pic?
The blue wound toroid is for feedback and OCD, The GDT is not viable in the photos, it's behind the 2 blue caps on the left side of the heatsink.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Goodchild wrote ...
Patrick wrote ...
Please forgive my ignorance, but why have you put those two large awg black wires through that blue wound toroid? Is that blue toriod for current measurement, or gate drive? Is your two inch diameter gate drive ferrite visible in the above pic?
The blue wound toroid is for feedback and OCD, The GDT is not viable in the photos, it's behind the 2 blue caps on the left side of the heatsink.
I see now, I was wondering why your text didnt match the pic.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
The first light test was only at 800Apk and we didn't use water cooling, and the primary didn't get above ambient temperature.
800Apk is not enough to heat the 3/8 copper at all, we did not use water cooling on this run. When it's hotter outside and we start to run in 1000 to 1500Apk range we will then water cool the primary.
Yes you will have to make some room at WWT 2012 for these big guys! Also we though at first that the coil would like the lower bit rates but as we tested the coil it turns out that this coil really favors BPS in the 100 to 200Hz range. The sparks grew an extra 2 or 3 feet when we doubled the bit rate from 50Hz.
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.
10KVA DRSSTC (Complete)
