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 #1773
Joined: Tue Oct 21 2008, 06:56PM
Location: Poland
Posts: 93
Hi!
For some time I have a problem running the inverter. The inverter is composed of a half bridge TL494 and multiplier generator connected to the high voltage transformer. Generated by changing the weight of the square I want to get the output voltage at the output of the multiplier. The main objective of the project is to regulate 25-70KV, with a maximum current of 30mA @ 30kV and 10mA @ 60kV. Half bridge is to be powered directly from the home network (230VAC). In the half-bridge transistors IRFP460 transistors are controlled by the GDT after the addition of the resistor which moves nicely square wave of variable width fill.
In parallel to the transistors between the source and the drain also used resistor with capacitor (series, 33nF and 8.2KOhm). With the transistors in a half bridge Schottky diodes, and ultra-fast recovery diodes.
In the diagram, some resistors and capacitors have a different value than in reality.
At the output of half-bridge is connected to a transformer. The primary winding is 30 turns. I connected to the secondary winding of the electrodes which light the arc.
The problem is that the damage is still half bridge transistors. I do not like half bridge output waveform. I experimented with adding inductance in series with the transformer, with additional parallel RC elements connected to the transistors, and nothing else. Also I changed the operating frequency is 25KHz currently. So really when you add RC parallel to each transistor output waveform has improved a little but further output waveform is too ugly. I noticed that after a short circuit waveform output electrodes already looks better but there is no dead time on it ..
Half-bridge output without additional RC:
Half-bridge output with additional RC:
Half bridge with short circuit secondary winding
upper course measured between the of G-S, lower course measured out half bridge:
Additional RC;
voltage multiplier which I intend to connect:
How can I solve the problem of damaging the transistors? Plans to put transistors on the 1200V, but it is not the solution ugly output waveforms. What else can I do?
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.
Adjustable high-voltage source
