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 #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
I have a couple questions about my SSTC- I used my dads triplett AC ammeter with an AC ammeter attachment that clips over one of the current carrying wires, and did some testing with my SSTC. I found that at 120VAC input, current looks like this:
On Time Off Time Current Lowest Highest 5A Lowest Lowest 12A Highest Highest 12A Highest Lowest 15A
Continuous (w/o int.) 18A
Is there a fluke (no pun intended) in my dads meter? All these figures seem really really high to me, except for the first one at 5A. That seems about normal for SSTCs. The meter was really far away from the operating coil, because otherwise, the needle always deflected full scale, even when the clamp was not around a wire :p Any suggestions, or is my full bridge actually sucking up 2160 watts when running CW? I guess I'd just be suprised if it was because I havn't popped a single mosfet yet (IXFH40N30)
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
EDY19 wrote ...
I have a couple questions about my SSTC- I used my dads triplett AC ammeter with an AC ammeter attachment that clips over one of the current carrying wires, and did some testing with my SSTC. I found that at 120VAC input, current looks like this:
On Time Off Time Current Lowest Highest 5A Lowest Lowest 12A Highest Highest 12A Highest Lowest 15A
Continuous (w/o int.) 18A
Is there a fluke (no pun intended) in my dads meter? All these figures seem really really high to me, except for the first one at 5A. That seems about normal for SSTCs. The meter was really far away from the operating coil, because otherwise, the needle always deflected full scale, even when the clamp was not around a wire :p Any suggestions, or is my full bridge actually sucking up 2160 watts when running CW? I guess I'd just be suprised if it was because I havn't popped a single mosfet yet (IXFH40N30)
If the needle (i'm assuming its analog meter) is steady during operation, then the current reading is probably valid.
The IXFH40N30 are rated for 40A @ 300V. Provided they are cooled, there is no reason they can't handle switching that much power.
If I run my Plasmasonic Audio Modulated SSTCs at full CW i easily get close to 2kW. They are usually consuming about 1kW when i run normally (50% duty)
Without additiona knowledge on what you doing (circuit, output arc performance, etc...) i would guess your numbers are real.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Those figures seem about right to me. Especially if your dad's ammeter is a moving iron type that reads true(ish) RMS, and you have a large filter cap on your DC bus. The spiky current waveform due to charging the big capacitor makes the RMS current higher still.
You can tell if a meter is moving iron because the dial will almost always be non-linear: the numbers are all squashed up at the bottom end and stretched at the top.
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.