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 #4537
Joined: Sun Apr 22 2012, 06:59AM
Location:
Posts: 9
Hi, I am currently using an IGBT to control high-frequency pulsing of rectified 220vAC (300v DC) for charging a capacitor.
the thing is, i need it t charge the capacitor up to 800v. (600v would do as well) I cannot use a capacitor voltage doubler on the AC, because i need a great current (that would require big capacitors, about twice 30uF film capacitors which are big )
I thought of pulsing the 300v (rectified 220v mains) through some inductor, to boost it and charge up to 600\800v.
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
moshik23 wrote ...
Hi, I am currently using an IGBT to control high-frequency pulsing of rectified 220vAC (300v DC) for charging a capacitor.
the thing is, i need it t charge the capacitor up to 800v. (600v would do as well) I cannot use a capacitor voltage doubler on the AC, because i need a great current (that would require big capacitors, about twice 30uF film capacitors which are big )
I thought of pulsing the 300v (rectified 220v mains) through some inductor, to boost it and charge up to 600\800v.
Registered Member #4537
Joined: Sun Apr 22 2012, 06:59AM
Location:
Posts: 9
something very strange on this schematic - follow the AC input, on one half wave it makes a short circuit, and on the other half it goes nowhere.
anyways i am familiar with the full bridge doubler, but it still uses capacitors to store the energy between cycles, and as the load draws more current, you would need larger capacitors - this is exactly what i am trying to avoid - i dont want to limit my charge current by capacitors.
right now i pulse directly rectified 220v AC. if i set the control unit, it will pump with full 16 Amps from mains. but if i use a capacitor voltage doubler, i would need HUGE capacitors to reach 16 Amps.
Why not just make your own step up transformer? 1:3 pri:sec ratio with heavy gauge wire on a large core will give you 660V at ~5A from 220V 15A. Then just rectify and filter and switch as needed.
Registered Member #4537
Joined: Sun Apr 22 2012, 06:59AM
Location:
Posts: 9
Sigurthr wrote ...
Why not just make your own step up transformer? 1:3 pri:sec ratio with heavy gauge wire on a large core will give you 660V at ~5A from 220V 15A. Then just rectify and filter and switch as needed.
that would be HUGE and heavy and expensive.
i'm trying to find a good solution for an non-expensive product. a big transformer is the worst solution in this case.
any idea on the boost converter ? would the inductor have to be huge as well ?
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.
switching 300v DC into 800v
