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Registered Member #2677
Joined: Mon Feb 08 2010, 03:06AM
Location: Palo Alto, California, USA
Posts: 64
I am designing a medium size DRSSTC and am considering using 60N60 mini brick IGBTs for the full bridge and am wondering how much beyond the maximum rated current they can be pushed without being destroyed. The datasheet" target="_blank"> says the max pulsed current is 300A for 1mS but I assume I can go over that for shorter periods of time? The max current will be around 500A for 200uS at a time. Here is a preliminary ScanTesla output file:
ScanTesla V-7.63 June 14, 2006 Terry Fritz Goal = 5.907322e+001 Maximum Leader Length Model Number = 14004 Goal Number = 86 Cprimary = 2.555000e-007 Lprimary = 2.152000e-005 Rprimary = 0.600000e-001 Coupling = 0.245000 Csecondary = 3.660000e-011 Lsecondary = 1.347400e-001 Rsecondary = 1.930000e+002 Cload = 8.845536e-012 Rload = 2.200000e+005 BPS = 2000.000000 Dwell (T1) Time = 2.000000e-004 Ilprimay Maximum = -484.012112 ICprimary RMS (Arms) = 140.353305 ILsecondary RMS (Arms) = 1.494841 VCprimary Maximum = -4294.563904 VCsecondary Maximum = -387266.575049 Coil Power = 5028.114013 Primary Bang Energy = 2.514057 Load Power = 1246.496362 Load Bang Energy = 0.623248 Leader Length (in) = 59.073215 Strike 40.000000 Primary F0 = 67874.015911 Secondary F0 = 71668.995487 Load Energy Rise Time (uSec) = 172.967517
These exact figures will probably change slightly but I will almost certainly attempt to keep peak current at around 500A. The coil will also run in audio modulation mode sometimes. Thanks!
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
Hi UbuntuNinja, first of all, I see something strange in your ScanTesla data: the BPS value is really high... Usually it is between 50 and 200... Why have you set such value?
However, I'm pretty sure that this IGBT can withstand more than 500Apk in a tipical DRSSTC use...
I'm building a medium sized DRSSTC based on the same devices and I would really like to know the maximum current for such IGBT...;-)
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
I have built a couple of coils with those IGBTs and they will take 500A but be careful not to push them past 100uS when running that much current. Or else you will have some blown up IGBTs on your hands
Registered Member #2677
Joined: Mon Feb 08 2010, 03:06AM
Location: Palo Alto, California, USA
Posts: 64
Ok thanks. Apparently the link i tried to embed in my post did not work so here is it again: http://ixdev.ixys.com/DataSheet/DS99177A%28IXGN60N60C2-D1%29.pdf or in case that does not work here is the plain text: I set the BPS value high intentionally because as stated in the original post, the coil will have an audio modulation mode. By the way, where are you planning to buy the IGBTs from? I am looking for a way to get the 60N60s cheaply. Eastern has them for $25 a piece but that's $100 for a full bridge which is beyond my budget. I am wondering if there is somewhere where they would be cheaper because you are buying 4 at one time. Mouser and other electronics distributes only give you a small discount for buying 10+ and I don't think I am going to be blowing these things up so much that I need 10 of them :).
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
UbuntuNinja wrote ...
By the way, where are you planning to buy the IGBTs from? I am looking for a way to get the 60N60s cheaply. Eastern has them for $25 a piece but that's $100 for a full bridge which is beyond my budget. I am wondering if there is somewhere where they would be cheaper because you are buying 4 at one time. Mouser and other electronics distributes only give you a small discount for buying 10+ and I don't think I am going to be blowing these things up so much that I need 10 of them :).
I bought them on digikey for something like 15$ each. I bought 10 pieces.
Registered Member #2677
Joined: Mon Feb 08 2010, 03:06AM
Location: Palo Alto, California, USA
Posts: 64
Goodchild wrote ...
I have built a couple of coils with those IGBTs and they will take 500A but be careful not to push them past 100uS when running that much current. Or else you will have some blown up IGBTs on your hands
You can't push them past 100uS?! Darn it I was planning on running the coil up to 200uS. Do you know of any similar IGBTs that could do up to 200uS at 500 amps?
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
Goodchild wrote ...
you don't need to run your coils at such high PWs I never run my coils much higher than 100uS
If you go much higher than 100uS your efficacy just starts to drop.
In my opinion what is needed for large sparks is high bus voltage and good tuning.
ON time is related to surge impedance of primary LC circuit. The lower the impedance the shorter the ON time and vice-versa...
Anyway, ON time between 100 and 200us is quite common.
It sounds strange that the IXYS 60N60 are so (ralatively) weak, since in the easternvoltageresearch site these devices are sold as alternative of the well known HGT1N40N60A4D which have been proven to be quite reliable up to 1000 Apk under the right conditions... Also, looking at the datasheet the two devices look quite similar.
Are you shure that you were in the right conditions, and are you shure about your peak current measurements?
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Luca wrote ...
Goodchild wrote ...
you don't need to run your coils at such high PWs I never run my coils much higher than 100uS
If you go much higher than 100uS your efficacy just starts to drop.
In my opinion what is needed for large sparks is high bus voltage and good tuning.
ON time is related to surge impedance of primary LC circuit. The lower the impedance the shorter the ON time and vice-versa...
Anyway, ON time between 100 and 200us is quite common.
It sounds strange that the IXYS 60N60 are so (ralatively) weak, since in the easternvoltageresearch site these devices are sold as alternative of the well known HGT1N40N60A4D which have been proven to be quite reliable up to 1000 Apk under the right conditions... Also, looking at the datasheet the two devices look quite similar.
Are you shure that you were in the right conditions, and are you shure about your peak current measurements?
Regards,
Luca
Ya i'm shure, 60N60s don't come close to 40N60s performance
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IXGN60N60 Max Current for a DRSSTC
says the max pulsed current is 300A for 1mS but I assume I can go over that for shorter periods of time? The max current will be around 500A for 200uS at a time. Here is a preliminary ScanTesla output file:
no matter how hard you try you will blow them up one way or another!
