Re: OLTC - Inside the PWRX CM600HA-24H

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: jimmy hynes <chunkyboy86-at-yahoo-dot-com> 

Hi,

I thought you could ;-) I guess it's worth keeping incase you want it later 
though. What is that
gel in there for anyway?

--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
 >
 > Hi Jimmy,
 >
 > Actually, Yes!!  But not sure it is worth the trouble.  The silicone gel is
 > really messy...
 >
 > Cheers,
 >
 >          Terry
 >
 > At 08:38 AM 4/15/2004, you wrote:
 > >Hey,
 > >
 > >It scared me when I saw the title ;-). Is it possible to fix it by
 > >clipping the bad dies?
 > >
 > >--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > > > Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
 > > >
 > > > Hi All,
 > > >
 > > > I got a batch of those 600 amp 1200V PowerX CM600HA-24H IGBTs that
 > > Steve C.
 > > > uses on his wonderful OLTC.  Mine were a little more "used" since a few
 > > had
 > > > red tech grease pencil "X"'s one them...  Hey!  I know what that means
 > > > :D  They did the preventive maintenance of replacing the IGBTs a few
 > > > milliseconds too late...
 > > >
 > > > No problem since I got them at 1% the retail price ;-))
 > > >
 > > > It read "gate ****** up" on the meter.  So I pulled the screws and 
applied
 > > > a "spread spectrum force instrument" to the case (hammer).  I then 
chopped
 > > > the buss bars and dug through the "gorilla snot" as is typical for those
 > > > familiar with the high art of de-kitting large brick power 
devices...  So,
 > > > as if Hot-streamer was not bogged down tonight with all 1500 of you
 > > > downloading the cap x-ray pics :o))), here is what is inside:
 > > >
 > > > http://hot-streamer-dot-com/temp/CM600HA-24H.jpg
 > > >
 > > > Just eight big ~ 20mm IGBT die in parallel and the eight reverse 
diodes on
 > > > a aluminum nitride substrate.  The gates on two have been over 
voltage and
 > > > fried two chips.  Probably another device incinerated and the buss 
voltage
 > > > got onto the gate buss.
 > > >
 > > > Sort of neat.  Be sure not the flex the copper bottom too much ;-))
 > > >
 > > > Cheers,
 > > >
 > > >       Terry
 > > >
 > > >
 > >
 > >
 > >=====
 > >Jimmy
 >
 >


=====
Jimmy