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 #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Steve Conner wrote ...
In resonant operation, the BJT part of the device can be pretty much recovered before the switching event even happens. Old, slow IGBTs can be pushed to surprisingly high frequencies.
Like when switching after current zero crossing? From what I have seen, the turn-on losses (including diode reverse recovery) are usually larger than turn-off losses, and the transistor being turned off could be prone to false triggering through the miller capacitance. However it could be true that the turn-ON SOA could be larger than the turn-off one (though the datasheet states just one value).
Registered Member #18516
Joined: Sat May 18 2013, 09:09AM
Location: Lancashire, UK
Posts: 38
Dr. Dark Current wrote ...
Output voltage.
Ok, trying to get my head round the circuit layout.
In full bridge mode, the full bus voltage is applied to the coil in both directions, using alternating diagonally opposite IGBT's. So the coil swings between +Vbus and -Vbus?
In half bridge, theres presumably some sort of voltage division? Looking at the diagram, theres a capacitive divider sitting where the other IGBT's would be, so this creates a midpoint of half bus voltage to one end of the coil, and the other end swings between +Vbus and 0v?
Registered Member #4104
Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
Aragorn wrote ...
Dr. Dark Current wrote ...
Output voltage.
Ok, trying to get my head round the circuit layout.
In full bridge mode, the full bus voltage is applied to the coil in both directions, using alternating diagonally opposite IGBT's. So the coil swings between +Vbus and -Vbus?
In half bridge, theres presumably some sort of voltage division? Looking at the diagram, theres a capacitive divider sitting where the other IGBT's would be, so this creates a midpoint of half bus voltage to one end of the coil, and the other end swings between +Vbus and 0v?
Pritty much , with a full bridge the supply voltage is switched in both directions across the primary , But with a half bridge you have 2 capacitors inplace of the 2 switches to act as DC blocking capacitors and create a mid point with half the supply voltage across each , so you get half the voltage swing across the primary
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.
IGBT Selection
