[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: Good IGBT List?
Original poster: "Leigh Copp" <Leigh.Copp@xxxxxxxxxxx>
I would have to agree with Steve here. The only way you get to reduce
the number of failed semi's is through a better understanding of how
they work. Search the manufacturer's websites for application notes,
and detailed datasheets.
Having blown up many single IGBT modules worth upwards of $2000 each
in my research, I have learned the hard way that the manufacturers do
not necessarily know everything either however.
In the quest for the root cause I have turned to local labs who had
the luxury of scanning and tunneling electron microscopy, in order to
try to help the semi fabs resolve their own failure modes.
Some technologies are better suited to this sport than others, and
the datasheets will tell you almost, but not quite, the whole story.
The IEEE Transactions on Power Electronics, and on Electronic
Devices, are a great place to start if you want to dive in head first.
On a simpler and more practical level, manufacturers like Powerex
(Mitsubishi + GE), Semikron, and Infineon (previously Eupec) have
excellent technical articles on IGBT theory, and applications.
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Fri 03/11/2006 9:08 PM
Subject: Re: Good IGBT List?
Original poster: "Steve Ward" <steve.ward@xxxxxxxxx>
There is no definative list of good or bad IGBTs. For one thing, i
dont think there are enough people qualified to make that judgment.
Many SSTC first-timers might blow up really nice IGBTs and mistakenly
think they are no good. Even experienced people (id consider myself
experienced in this area) will experience semiconductor failure. Many
times, given the circumstances, it can be difficult/impossible to know
for sure what the failure mode was, or what caused it. I usually have
to speculate on the failure, and then revise the design to eliminate
what i think was the cause of failure.
I want to add that, the IGBT you want will vary greatly on
application. For really big coils, where the resonant frequency is
low, you can tolerate slower IGBTs (that is, slower switching times).
But, for smaller, high frequency coils, you must be very careful to
select the proper IGBT. This is speaking for SSTC/DRSSTCs. In the
case of an OLTC or the SISG, the constraints are different. Switching
speed isnt quite as important.
Id suggest trying to find more information about how IGBTs work, and
then you should be able to decipher the information on the datasheets,
and determine what IGBT looks like it may work for your project. Of
course, there is always a trade-off with cost.
On 11/3/06, Tesla list <tesla@xxxxxxxxxx> wrote:
>Original poster: G Hunter <dogbrain_39560@xxxxxxxxx>
>I may be behind the times here. Does a good IGBT / bad
>IGBT list already exist, similar to the good cap / bad
>DigiKey, Mouser, and others offer so many hundreds of
>different IGBTs, it's just overwhelming. Even when I
>do zero in on a spec sheet, as a non-engineer, I'm not
>always sure what I'm looking at.
>I confess I did not consult the list archives. Is the
>info already in there?