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4hv.org :: Forums :: Tesla Coils
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IGBTs in parallel

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Dr. Dark Current
Sat Apr 09 2011, 07:43PM Print
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Is it OK to put two IGBTs in parallel if they are on the same heatsink and from the same batch? This is for a SSTC fullbridge with some 50 amp estimated peak current at ~200 kHz, these are the devices I wanted to use: Link2

Maybe you ask why don't I use an IGBT with higher current rating, well the reason is that these are really cheap and two of them in parallel are faster and have lower gate charge than a single device with twice the ratings.
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Gregory
Sat Apr 09 2011, 08:07PM
Gregory Registered Member #2922 Joined: Sun Jun 13 2010, 12:08AM
Location:
Posts: 226
It can work, but is very dangerous.. The igbt's are not "100% equals" internally. If one switch before or after the other you will get big problems; and it will occur! 200khz is a very high frequency to put devices in parallel, don't try!
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101111
Sun Apr 10 2011, 12:16PM
101111 Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
It might work, but if I were you I would match the IGBTs.

Check out Link2 for some interesting reading.
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Wolfram
Sun Apr 10 2011, 12:40PM
Wolfram Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
What is the reason that you want to parallel a pair of those IGBTs? You could easily find a similar single IGBT with over twice the current rating.
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Nah
Sun Apr 10 2011, 03:54PM
Nah Registered Member #3567 Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260
Dr. Kilovolt wrote ...


Maybe you ask why don't I use an IGBT with higher current rating, well the reason is that these are really cheap and two of them in parallel are faster and have lower gate charge than a single device with twice the ratings.
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teravolt
Sun Apr 10 2011, 04:34PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
hi Kilovolt you can add igbt's in parallel if you use mached sets or bach no. also you can put low ohm,low inductance, resistors of .1 or so in each drain. what I want to do along the same lines as this thread is to put about 5 igbts of 1200v in series and make a 5kv bridge. have you tried that
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ScotchTapeLord
Sun Apr 10 2011, 04:51PM
ScotchTapeLord Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
I would think series would be trickier, as you'd have to match the off-state capacitance as well as resistance for a bridge, which will add to turn-on losses. Typically I would never series any active component that isn't avalanche rated.
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Wolfram
Sun Apr 10 2011, 07:55PM
Wolfram Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Oh, sorry, I missed that part about them being cheaper and faster.

Anyways, I think it's more appropriate to buy a single IGBT with the right rating, as there isn't all that much money to save, unless the smaller IGBTs are a surplus deal. The HGTP20N60A4 is three times the current for around three times the price, and it's actually even faster. It actually takes 5 times as much peak current, which can be useful if you want to try a DRSSTC.
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Dr. ISOTOP
Sun Apr 10 2011, 10:27PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
There's a seller on Ebay selling HGTG30N60B3D IGBT's @ $24 for a rail of 30.
Nice things...hard to beat 80 cents a transistor.
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James
Mon Apr 11 2011, 03:56AM
James Registered Member #3610 Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
Hey that's a good deal, although the postage is quite steep.

I don't like to parallel IGBTs. Mosfets on the other hand can be paralleled very easily. The resistance rises with temperature so they are self balancing.
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