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Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Whilst surfing the Powerex site, I ran into these "cute" little things. Anybody seen these? They look *extremely* cool:
(Powerex QIS4506001) (Powerex QIS4506002)
These are the same IGBT in different packages. The former is available from Rell for $180 each, and they've got hundreds in stock. Briefly, these are 4.5kV IGBT discretes. The docs say that the pulse current is 120A, however the Powerex press release gives the figure of *1000A*, and unfortunately the test conditions are not disclosed in either case (I have requested them, though).
(Powerex newsletter featuring these IGBTs)
The devices are in rather odd packages; the mounting plate *is* the collector. Makes me wonder what the "cool" way to heatsink and mount these things is? Any thoughts?
If the 1000A figure is representative of what might be expected of these in SISG service, then it seems like these would make for a fantastic compact, low-part-count SISG, and are (relatively) economical, especially next to the high-voltage "bricks".
I am going to buy one to play with.
Naturally, this leads me to wonder if there are higher-voltage SIDACs that might work, since sticking a dozen or more 300V SIDACs on a board next to one of these IGBTs seems "funny" to me. Unfortunately, the higher voltage SIDACs I see don't seem to have any heatsinking provisions, and their datasheets lead me to believe they they're not really meant for rapid, repeated pulses. The datasheet for the "Terry" SIDACs, to contrast, has a very reassuring chart correlating peak pulse current with pulse duration and rep rate. So I'll probably go with those, since they seem certain to work (and I have a boatload of them, so they're "free" )
EDIT: Should add that these don't have the reverse diode built in, so that needs to be added externally.
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
A good point. But I suppose there are *two* interesting dimensions to the SISG: Inexpense and simplicity. Carrying either to its extreme involves some forfeiture of the other, in my opinion. Simplicity, to me, includes part count, and the idea of a business-card-sized SISG board that'll do the same thing as one of the bigger 4x1200V boards is "cool" and "fun" to me. And if these can reasonably be regarded as "tougher" than the IRF parts w.r.t. pulse current (TBD), then for what you get, they might not really be regarded as "too expensive", especially after you deduct the savings you can derive from using fewer boards, heatsinks, and (possibly) other parts.
Plus, as these appear to not only be the cheapest but also the most available HV IGBTs anywhere, it seems a pitty not to "play" with them, hehehe
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Sulaiman wrote ...
For a high-voltage 'SIDAC' use Xenon flash tubes or small spark gaps.
It's funny, I actually suggested the spark gap idea (the "IGBT-assisted Spark Gap") to TCML as a variation on the SISG some time back, however it was quickly (and rightly) dismissed at the time because it would be almost completely unworkable with the 1200V IGBTs. Stacking them would get really tricky. With these 4.5kV ones, it might actually work. Trouble is, a misfire could roast your IGBT(s). Perhaps a string of SIDACs is more reliable in that case.
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Powerex QIS4506001 and -02: The ultimate SISG IGBTs?
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