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 #8497
Joined: Tue Dec 04 2012, 06:24PM
Location:
Posts: 74
Just as a reference for others - the reverse current spike from a dumping 100J (at 160v) into a coil can destroy an anti-parallel TVS (unidirectional) diode (Digi P6KE300AFSCT-ND).
It means that for the current 3.6A running through the coil at the moment IGBT is switched off the voltage spike on that diode will reach 414V. And for this diode it is the maximum current it may sustain without damage (well, I would double this value considering short single pulse condition). The less the value of clamping voltage the higher the current it may sustain. The higher the peak power dissipation value, the higher current is allowed for the same clamping voltage. This diode is ranked 1500W - look for smg around 15kW or higher and consider some paralleling or serializing. To estimate the characteristics of the zener you need check the current running through the coil when your IGBT closing. If it is 300A then for 1500W zener the voltage rating must be not higher than 5V, which is pretty senseless. For 15kW zener it will be 50V, which is much better. If you will be able to find and buy 36kW zener (seen somewhere) than you can buy 120V zener and it may be enough.
WHAT?!?! It doesn't matter! Man, there are a diode in series with that zener - this one will not let the current run. Oh, don't tell me that you forgot to put a diode in series with the zener! :)
Registered Member #8497
Joined: Tue Dec 04 2012, 06:24PM
Location:
Posts: 74
Technically you shouldn't need a regular diode. A TVS diode will function to block reverse voltage...Which it did at lower voltage tests....Which is why I originally used a high-voltage TVS....don't worry, higher wattage TVS's are en-route.
You can ommit regular diode ONLY if bi-directional TVS diode used, with breakdown voltage higher than cap's voltage. So in general, put normal diode to avoid possibillity of silly mistake - it will cost you blown IGBT, TVS and dirty pants.
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.
TVS Diode Failure
