Halfbridge anti parallel diodes? / Electromagnetic Projectile Accelerators / Forums

Welcome

Online

Members Birthdays:

No birthdays today

Next birthdays
09/29 Ultra7 (54)
09/29 uitvinderalex (36)
09/30 Terrorhertz (15)

Contact

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.

Forums

4hv.org :: Forums :: Electromagnetic Projectile Accelerators

« Previous topic | Next topic »

Halfbridge anti parallel diodes?

Move Thread

LAN_403

Lekky1

Sun Mar 15 2009, 10:18AM

Registered Member #1592 Joined: Thu Jul 17 2008, 06:58AM
Location:
Posts: 11

Hello all.
I have nearly completed my second version of a single stage halfbridge coil gun & need some advice on choice of IGBT's..

I have two to choose from: FHGTG27N120BN or FGL60N100BNTD.

The FGL60N100BNTD is a 60A/1000V device with an integral anti parallel diode & the FHGTG27N120BN is a 72A/1200V device, but has no anti parallel diode incorporated.

I am using a cap bank charged to 300V.

Are antiparallel diodes a necessity with halfbridge switching topology?

I have searched the wiki & googled the topic, but have found no clear answer.

Any help will be greatly appreciated!

hotcrazyfruit

Tue Mar 17 2009, 03:04PM

banned on 5/26/2009
Registered Member #1877 Joined: Mon Dec 22 2008, 02:03AM
Location:
Posts: 147

well... the arent a nessesity, but they sure wouldent hurt anything. i would recommend getting the 72 amp one, and just putting an anti parralel diode with it. so you can have a higher current rating. if i understand igbt's right...
edit: YES an anti parralel diode IS nessary. i didnt read that you were building a coil gun. and an anti parralel diode will keep the bank from charging to a negative polarity. which will seriously screw them up. this is because the ring bank effect from the coil, it isnt nessesary when you discharging it into stuff, like ic's and micro controllers. xD LED's are esspecially fun to blow up with 5 kj

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob

Legal Information