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 #593
Joined: Tue Mar 20 2007, 12:32AM
Location:
Posts: 50
Hello, I took some measurements yesterday of my half bridge SSTC and was somewhat surprised at the results. I am currently getting 10-11 inch air streamers and 12-13" arcs to ground from this system. The coil is basically Steve Ward's MiniSSTC using a half bridge of IRFP260N mosfets, a pair of UCC's and a remote interrupter.
I started getting much longer sparks after I used this driver to test and get some Fo measurements for the secondary I recently wound for my first DRSSTC. The resonator is 12.5" winding length, by 4.5" long, wound with AWG 31. The primary is 4 turns 10 gauge stranded close wound directly over the Envirotex secondary coating, about 1 inch up from the bottom turn. On top, I have a 6" x 1.75" John Freau toroid, with the old ACR from my 6" distruptive coil as the main toroid. This toroid is 11.75 x 2.75. With this stacked topload configuration, I measured the frequency (by looking at the efield of the running coil on my scope) to be 178Khz.
Here's a video of the coil making the above described sparks via a PRF of around 30hz and an on-time of 2ms:
With the coil operating in this manner I used a Fluke 30 clamp meter to measure a current draw of 0.7A from the wall at 120V (which is the max voltage I have dared with these 200v mosfets). I thought 84 watts for 1 foot sparks seemed more efficient than the average conventional antenna feedback SSTC. I did notice that increasing the on time produced the expected increase in power draw.
Anyone have any power measurements from their antenna feedback half bridge systems running at low PRF and short On-times? Perhaps I should get a Kill-A-Watt, or equivalent power meter. With my VTTC work, and SSTC work up until this point I have just measured current with an amp clamp and then multiplied...however, I know this doesn't take certain things into account, such as power factor. Now that I have started on the design of my first DRSSTC I will need to hone my quantification skills.
Opinions? I can provide numbers for other interrupter settings if anyone is interested.
Registered Member #593
Joined: Tue Mar 20 2007, 12:32AM
Location:
Posts: 50
Steve,
I gave the PRF plus Pulse width...30 and 2ms respectively. I figured everyone would derive the duty cycle from that. In fact, wouldn't that be a 6% duty cycle?
But yeah, 84 watts seems close to the numbers you show in your DRSSTC 0.5 page...however, I am sure if we substituted my 12.5" winding length 4.5" diameter secondary into your .5 driver, it would give much longer sparks at 84 watts.
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.
High efficiency for half bridge MiniSSTC?
