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 #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Fiddy wrote ...
Sure is, with a induction heater style ZVS ive put more than ~20A at 24VDC into this flyback and its handled it.
With a 10 turn primary, 22VDC loaded @ 17A it was putting out 13.2kVAC RMS @ 28mA and has capacity for more!
I like AC flybacs too, as theres no guessing the ratings on diodes, diodes to fail, or bizarre resistors and pots hanging off the sides. But, how do you know it's 13.2kVAC and 0.028A ? This would equate to 370 watts.
If so, 13,200 v / 3,000T = 4.4 V per turn. And 22 V / 10T = 2.2 V per Turn.
so your gaining twice as much output voltage as the turns would allow in a conventional topology. Generally i like Flybacks, as we gain winding advantage, but lose on power transfer. Though in a ZVS mode maybe there's not so much power lost.
With 3000 turns with a 1 inch diameter means Pi x D = C and 3.14 x 1 = 3.14 in x 3,000T = 9,420 in of 28 awg. 28 awg = .213 ohms per meter, 9,420 in to meters = 239 meters. 239m x 0.213 ohm = 51 ohms.
so, if .028A x 51ohms = 1.4 real volts dropped by current (non reactive) 1.4 VAC x 0.028A = 0.04 watts heating in that secondary, so thats good.
have you run it long enough to judge ferrite heat accumulation?
The circuit he's using uses bipolar ZVS drive iirc so it would be +- 22V seen by the primary. Oh and he said he's inputting 374W. 40mW waste in the secondary sounds really good. As it's ZVS the primary would see only resistive losses too.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Fiddy wrote ...
Not too sure on price as of yet, it maybe around $40USD it all depends on the bulk factor.
Then there is postage from Australia.
ZVS runs in push-pull mode, not flyback mode. You don't usually need an air gap for push-pull mode.
Patrick wrote ...
so your gaining twice as much output voltage as the turns would allow in a conventional topology.
If run in flyback mode output voltage should be higher. Flyback mode doesn't depend on turns ratio. The only factor that depends on turns ratio in flyback mode is the reflected voltage seen by the primary (and the switch).
The energy stored in the airgap pushes the voltage up to whatever the load (and current) dictates. The higher the impedance of the load, the higher the voltage. A flyback (in flyback mode) is a coupled inductor, not a transformer.
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.