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Registered Member #3964
Joined: Thu Jun 23 2011, 03:23AM
Location: Valenzuela City
Posts: 332
Hi,
I'm planning to use an IGBT switch for my full bridge QCW ~350kHz, just a quick question before i buy the parts. 2 IGBTs came visible to my requirement:
1. IRGP50B60PD1PBF - Some coilers swears to it, good feedback heard from them, due to its low losses 2. FGH60N60SFD (NOT SMD)- Never seen a coiler used it before, but it has higher current rating than the one above, lastly, cheaper.
I'm planning to set the OCD about 300 Amps., plus I plan to parallel them. I hope you can help me decide guys, because i'm buying for bulk and i don't want to lose money to wrong / lesser components. Thanks in advance! happy coiling to everyone!
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I have used the IXGN60N60 minibloc IGBTs in a medium DRSSTC at 70 kHz and a small at 300 kHz, see my site for details on the coils.
I think people stated blowing these up at 600-700A, as for QCW duty I have no experience.
One of the important parameters are also the thermal characteristics, where these two you linked are about identical, but you could also aim for some with even lower ratings which is even more important in a QCW with its long on-time.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Compare 1) Switching loss (@ the same Ic) 2) Thermal impedance @ the required pulse length. When you're at it, you can also calculate the temp rise. In both cases less is better.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Julian, those 2 parts look like they could be exact replicas of eachother, i think either would be perfectly suitable for the application.
If you want to run more than a few % duty cycle, then cooling becomes more challanging, and you may want more devices in parallel to spread the heat out.
Here is my rough recommendation for those parts assuming ~350khz and 450V max:
Low duty, ZCS only : 120A per device (peak)
High duty, ZCS only: 60A per device.
Low duty, Phase shift (hard switching): 60A per device
High Duty Phase shift: 30A per device.
My calculations for the additional switching losses for phase shift bridge control suggested the power dissipation is a bit over double what it would be for ZCS. When you factor in the higher Vce at more amps, it says you should run them at half the current when hard switching. Again, these are very rough estimates.
Also note that simply paralleling IGBTs does not guarantee perfect sharing, so the more you parallel the more you should derate them. You could use individual gate drives and use extra means of forcing current share if you think its worth it (i do in some cases). Also, going beyond 2 parallel devices starts to get harder to force them to share because of layout inductance mismatch.
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QCW IGBT Selection
