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 #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I'm looking to build a half bridge because my ZVS is annoying, anyway I have 45v 20a PSU, I have 5 IRFP250N's left, I also have a ATX PSU, works but I cannot get it to start up (even when I ground PS-ON and PWR-OK)
Would I be able to make a halfbridge with these?
Also a quick question, that wasn't solved in my old thread, my ZVS at 45v~ 10a (drops to 25v when arc is stretched out), anyway the wires get hot, only the negative outputs of the ZVS get hot, and only near the flyback they get hot so in other words only the flyback wires get hot, never used to. Also I'm using IN4007 diodes, I have 200v power rectifiers will I benefit using these? I have also made a big inductor. as power input is pretty high.
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Patrick wrote ...
Does everyone else see Pink block space? or is my computer puking from a virus?
Sorry about that I guess e107 doesn't integrate spoilers.
I've also been messing with my ZVS and iggy, but it only works with two ferrite inductors (I'm not using a flyback core) it is directly on the ZVS, anyway back to the question...
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
You will need a PWM chip of some sort to drive the half-bridge, preferably an SG3525 but there are variants that use a 555 timer and TL494 chips. I have only built the SG3525 version myself.
Your power supply voltage dropping means that it cannot support the load.
1N4007 will be too slow for the switching frequency's involved here, something like a UF4007 would be a better choice. You can request these from Vishay (but remember not to abuse this service, request something like 10 of them max).
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
wouldn't the electrons actually be leaving the negative terminal and bombarding the positive, since the whole traditional current thing is backwards?
check out uzzors site for a few simple power supply and inverter designs. texas instruments will probably sample you a SG3525 or TL494 and 555. just make sure you get a DIP packaged version since a lot of their stuff is smt.
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
Forty wrote ...
wouldn't the electrons actually be leaving the negative terminal and bombarding the positive, since the whole traditional current thing is backwards?
check out uzzors site for a few simple power supply and inverter designs. texas instruments will probably sample you a SG3525 or TL494 and 555. just make sure you get a DIP packaged version since a lot of their stuff is smt.
That is correct regarding electrons but ions are positively charged which means that they are attracted to the negative terminal, and since they have much more mass than electrons they create more heat when they hit the electrode.
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.
Halfbridge?
