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
you can use a PFC+step down ferrite transformer for an "all in one solution" up to 1kva easy, they sell IC's for this purpose with line, 100-265Vac, low voltage, inrush current limit, programmable limits and so on type safety features, i cant remember my preferred part number atm. ill look it up at home for yah...
Registered Member #5457
Joined: Mon Jun 25 2012, 06:42PM
Location:
Posts: 14
ben123324 wrote ...
I agree with bwang. A flyback is a good solution and is only limited by the core. ...
But wait, Flyback circuits are for generating output voltages which are higher than the input voltage right? That's not what I need, I need 230V -> 0-50V Or am I wrong?
Patrick wrote ...
you can use a PFC+step down ferrite transformer for an "all in one solution" up to 1kva easy, they sell IC's for this purpose with line, 100-265Vac, low voltage, inrush current limit, programmable limits and so on type safety features, i cant remember my preferred part number atm. ill look it up at home for yah...
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Look for a Xantrex XHR series power supply on EBay. They come with 1kW output in several voltage ranges: I picked up the 0-150V, 6A one quite cheaply.
You misunderstood how zero voltage switching works. The whole idea of a SMPS is that it converts the line frequency ("50Hz") to a higher frequency. Even then, skipping whole cycles isn't a popular control scheme. The Xantrex unit uses an H-bridge (of IRFP460 MOSFETs) with phase-shift control. Small snubber caps across the FETs give zero voltage switching. Or zero current, I forgot which.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
the IC is FAN4800IN from fairchild, etch a board stuff it and you can make your own smps, they include the math and circuit examples and explanations for using it.
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
ben123324 wrote ...
I agree with bwang. A flyback is a good solution and is only limited by the core. But if you don't care about isolation, you could do a mains buck converter to eliminate the core. Keep in mind that you'll need a logic supply transformer(or another smps) to power the low voltage control circuit.
But I agree with the smps idea. I powered my zvs flyback driver off of a 12 smps and got a nice quiet hiss, but the I wanted more power. So I rewound a mot, got a 35vdc off of it, but the 15v 60hz ripple (see he exploding lytic thread :D) voltage put a humm on he arc.
I think the OP wants a step down supply, so direct buck down from mains would be inefficient. And no, flybacks aren't just step-up. If you use a step-down transformer it steps down (Vo=D/(1-D)*N*Vin)
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.
Any ideas for a compact high current power supply with variable voltage?
They come with 1kW output in several voltage ranges: I picked up the 0-150V, 6A one quite cheaply.