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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
If i wanted to make an H-bridge, in drsstc duty, with two of each of these two devices, would it work?
They are pretty dang different, especially in gate charge. My main worry is the rise and falls times. I am sure it is possible to use these, but you would need extremely accurate delays on the gates with precise measuring equipment, which even if possible would still be totally impractical.
But, i am not sure how big of a problem this is at around 65KHz. I am not even sure if these IGBTs would do 65KHz at 600 or so amps.
If it would work, how should they be connected? The same type on either side of the bridge, or each pair that conducts together the same type?
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
The ST part looks fine. The IRF part is likely too slow. I would make a half bridge with two of the ST devices, or buy 4 60n60's, Digikey has them for $18 each.
EDIT: Oops, as has been pointed out, the times on the ST part are in uS not nS. Silly me. So yes, the ST part is likely too slow.
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
The ST device seems much slower to me... those times are in microseconds! Though the IRF is rated for low frequency (1kHz), the delays don't seem worse than any common brick that people claim to be able to use to 100kHz...
I really don't know if the ST device itself is cut out for 65kHz at all, let alone mismatched with the other one... unless you have a ridiculously low Fres...
Generally, if you are unsure, it's best to take a different approach.
Registered Member #2161
Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247
As has been said, the ST parts are horribly slow, I have seen 1000A power bricks with faster denoted switching times.:-O I would not run them at 65kHz personally, with their unbelievable long turn off and fall time, i would be iffy running them above 10kHz.
I would not mismatch the two, for a number of reasons, namely having both parts conduct simultaneously...boom. The entire turn of period of the ST is about 2x as long as the IR part, at the very least some serious dead time will have to be introduced, if you want to go ahead with the plan.
The IR part should be fine, especially since I suspect 65khz is your sec Fres, meaning your primary will resonate around the 50k area. That being said, the IR part is not exactly on the fast side of things, either. However, as has been mentioned on this forum, in several articles and power electronics books, IGBTs behave quite differently under resonant soft switching.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I wouldn't touch the ST one with a barge pole! It's completely wrong for a DRSSTC type application.
(If the ultra-slow switching doesn't discourage you, the mention of a "latching current" in the datasheet should.)
It was probably designed for the output inverter in an AC TIG welder. That only has to run at a few hundred hertz, and the current can never get more than whatever the operator sets the welding current at.
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
MinorityCarrier wrote ...
I'm not trying to hijack this thread, just given the subject, I am curious if Toshiba MG500Q1US1 IGBT's are fast enough for a DRSSTC.
They speed and peak current ratings are similar to those of the well known CM600HA-24H, so I think there's a very good chance they'd work very well in a big DRSSTC. Personally I wouldn't go much above 50kHz with them.
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Are these IGBT's compatible in a bridge?
