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 #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
The threshold voltage is where the switch begins to turn on, from the graph in the datasheet you should run it with 9V for a low voltage drop. The saturation voltage is the collector-emitter voltage at saturation. Check Fig 4 in the datsheet and it should make more sense.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Just run it from 5V directly, it'll be more effective. Increasing the frequency will lower the peak current through the inductor and thus current draw. IIRC mine would only draw 3A at 12V.
Registered Member #1341
Joined: Thu Feb 21 2008, 05:06AM
Location:
Posts: 17
But I though that the IGBT needed 9V to turn on. I would need to find an IGBT that has a saturation voltage of under 5v a turn on voltage of under 5v and a voltage rating of more than 800v correct?
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Yes to the IGBT rating. Since it'll be hard to find, I suggest you just bite the bullet and use a 12V battery. A 5 to 12V converter will waste too much energy.
Registered Member #1341
Joined: Thu Feb 21 2008, 05:06AM
Location:
Posts: 17
I think I can get it to work. As I don't have room for a 12v battery (I am using a mini-LST from Losi) The battery I am using now is 6 AA Ni-MH cells for a total of 7.2V. I also have a whole rail of MOSFETs. They see like they will work at 7.2V. I will use 5V for the comparator though as I already calculated and ordered the resistors, that will also give me a more stable charge like in the schematic. Please tell me if you see anything wrong with this. Thanks for all of your help, Justin
Registered Member #1341
Joined: Thu Feb 21 2008, 05:06AM
Location:
Posts: 17
Something went wrong. I turned on the boost converter (attached to a 800v 440uf bank and +12v from a computer power supply) The capacitors voltage quickly jumped to 12v but then stopped. Nothing happened the comparator LED stayed off and the reset pin was at 10V. Then as I was checking the voltages the MOSFET fried. It was really hot and it let some smoke out. Also the diode was warm. What would cause this if the voltage stayed at +12v. Also if I toggled the enable switch I could something get the capacitors up to 50v. Luckly I have 15 more MOSFETs. Any ideas?
Edit: the voltages on the discharge and threshold pins was 62.4mv and the output was 0.04mv.
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.
12v to 450v+ Boost Converter
