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 #54503
Joined: Sun Feb 22 2015, 10:35PM
Location: New Zealand
Posts: 288
Hydron wrote ...
Appears that this is a tried and tested way of killing bricks (see link above)
OK, very interesting, at least its not just me!
Now ive got to wait for my IGBT replacement to arrive. Im wondering if soldering directly to the IGBT is a better idea? Either way, I dont like using cat5 cable for the GDT, but i dont think there is any better option, you just have to be careful when stripping the stuff.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Nzoomed,
When you strip the cat5 cable, it is difficult to avoid circumscribing a nick into the copper, and later on, this point is likely to break off. One way to avoid this is, to solder a length of multistrand wire to the end of the cat5, and heatshrink that connection. The benefit of this is, that the multistrand wire is flexible, and unlikely to transfer a bending momentum to the solid cat5 wire, therefore making it less prone to breaking. Another benefit is, that you can colour code the gate wire to make it straightforward to phase the bridge.
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Finn Hammer wrote ...
Nzoomed,
When you strip the cat5 cable, it is difficult to avoid circumscribing a nick into the copper, and later on, this point is likely to break off. One way to avoid this is, to solder a length of multistrand wire to the end of the cat5, and heatshrink that connection. The benefit of this is, that the multistrand wire is flexible, and unlikely to transfer a bending momentum to the solid cat5 wire, therefore making it less prone to breaking. Another benefit is, that you can colour code the gate wire to make it straightforward to phase the bridge.
Hope this helps. Cheers, Finn Hammer
I like to strip small single strand wires with my fingernails.
It works really well for normal PVC installation wire :D
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
You could also use stranded CAT5e (the stuff for patch cables). Less likely to run into issues with that (is what I use). Finn's suggestion is also good.
Registered Member #9614
Joined: Mon Jan 14 2013, 10:00PM
Location:
Posts: 44
Personally I have never used spade connectors on IGBT gates because 1. I didn't have any and 2. I don't trust them. I've just been soldering them directly. I've also been using solid CAT5e cables with no problems. Depending on the insulation type, even if you knick it while stripping it, when you solder the wire the insulation will shrink back a bit and you'll end up covering the knick with solder anyway so that wasn't ever an issue for me either.
How are you sourcing your IGBT's? I just checked eBay here in the USA and I can get some surplus for $25 a piece plus $8 shipping. I'm sure there's a way we could help you out so that you aren't paying 300NZD ($212 USD) for two CM300s.
Speaking of CM300's you can push them further than 750A... that's almost in spec even! I push my CM200s up to 900A at 100kHz...
Registered Member #54503
Joined: Sun Feb 22 2015, 10:35PM
Location: New Zealand
Posts: 288
Alex Yuan wrote ...
Personally I have never used spade connectors on IGBT gates because 1. I didn't have any and 2. I don't trust them. I've just been soldering them directly. I've also been using solid CAT5e cables with no problems. Depending on the insulation type, even if you knick it while stripping it, when you solder the wire the insulation will shrink back a bit and you'll end up covering the knick with solder anyway so that wasn't ever an issue for me either.
How are you sourcing your IGBT's? I just checked eBay here in the USA and I can get some surplus for $25 a piece plus $8 shipping. I'm sure there's a way we could help you out so that you aren't paying 300NZD ($212 USD) for two CM300s.
Speaking of CM300's you can push them further than 750A... that's almost in spec even! I push my CM200s up to 900A at 100kHz...
If you can provide me the link to one of those listings, that would be great!
I was searching for them on ebay (CM300DY-24H), and the cheapest ones i could find from china were around $98 USD.
I know there are a few variants in the CM300 series, and some have to be modified to work properly for TC use. I think there is a 24F etc? the 24NFH i think need the modification inside.
Are you sure you are not referring to the 600V version (12H?) I know these are alot cheaper.
Anyway, thanks for everyone's suggestions, I too had been thinking of soldering stranded wire to the ends, and i think i will modify all the remaining connections this way and solder to the gates.
I had seen spade terminals used on other projects, and naturally thought that was a good idea.
There is stranded cat5/6 cable available, as is used in patch leads etc. I was not sure if this stuff was suitable, i know from using the stranded stuff in the past that there is not much wire to play around with either.
As far as current goes, yes I know they can handle much more than 750A. I actually want to upgrade the coil to take more, main thing is the MMC will need to be beefed up, it can only take about 850A max currently.
Registered Member #9614
Joined: Mon Jan 14 2013, 10:00PM
Location:
Posts: 44
Not the F version (you won't need to cut out the RTC!), but also not the NFH version (slower) but I don't think there's any issue with using them in a coil.
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
Alex Yuan wrote ...
Not the F version (you won't need to cut out the RTC!), but also not the NFH version (slower) but I don't think there's any issue with using them in a coil.
This is the seller i bought my MMC caps off (48x 2uF 1kV Aerovox snubbers). They couldn't ship to NZ but i got them sent via Youshop ( ) which cost about $100 but didn't have much other choice. They were nice and friendly and gave me an approximate size of the box before I hit "Buy Now".
Registered Member #9614
Joined: Mon Jan 14 2013, 10:00PM
Location:
Posts: 44
Hydron wrote ...
This is the seller i bought my MMC caps off (48x 2uF 1kV Aerovox snubbers). They couldn't ship to NZ but i got them sent via Youshop ( ) which cost about $100 but didn't have much other choice. They were nice and friendly and gave me an approximate size of the box before I hit "Buy Now".
Yup, I've bought snubber caps from them before too. As well as a bunch of electrolytics. No problems with them.
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.
Have my bus caps died?
