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 #1383
Joined: Mon Mar 10 2008, 11:09AM
Location: Wollongong, NSW
Posts: 27
I measured the inductance to be about 0.55mH and when the secondaries were connected my multimeter read 0.00mH but assuming it was 0.01mH (minimum readable inductance on my meter) then k = 0.9909, otherwise its obviously 1.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Maybe I'm completely wrong but it seems you have a death time on your output from your gate driver. Is it even possible to a have death time in case you are using GT? I've always thought that you need freq. modulation and not PW in case you use GT or not??? What are the wave forms in case you set it up with zero death times?
Registered Member #1024
Joined: Sun Sept 23 2007, 10:56AM
Location: Northern NSW, Australia
Posts: 95
I notice you have quite different waveforms on each GDT. Assuming both are the same core,wound and layed out the same, it may well be something else. I would be triple checking the layout of your output bridge, and replacing all driver chips. Have you tried swapping just the GDT's and seeing if the waveforms follow?
I am assuming of course that the waveforms on each GDT in the plasmasonic should be the same.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Uzzors wrote ...
Mates wrote ...
Is it even possible to a have death time in case you are using GT?
It's perfectly possible, you just need to short the core during deadtime.
Dead time (not death time) is 50%. This is done purposely as to reduce power dissipation in the MOSFETs. Bias state is 25% ON time which when pulse width modulated can modulate from 0% to 50% max.
Registered Member #1383
Joined: Mon Mar 10 2008, 11:09AM
Location: Wollongong, NSW
Posts: 27
Dylan wrote ...
I notice you have quite different waveforms on each GDT. Assuming both are the same core,wound and layed out the same, it may well be something else. I would be triple checking the layout of your output bridge, and replacing all driver chips. Have you tried swapping just the GDT's and seeing if the waveforms follow?
I am assuming of course that the waveforms on each GDT in the plasmasonic should be the same.
Well the cores the reason for the earlier differences in waveform was due to two dead gate zeners, having fixed that the cores appear more consistent.
The plasmasonic signal should be the same with the except a 180deg phase shift and possible differences in pulse width.
I've been experiencing this waveform for pretty each of the 5 or so different GDT pairs I've wound.
To those experienced out there, what seems most likely? That the core material could be incorrect (though claimed to be type 77, which is said to be fine), or there is a leakage problem between the secondaries and the MOSFETs or that it is some other factor on the board (or off it for that matter :) ).
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.
PlasmaSonic II based SSTC, with poor performance
