Re: OLTC - Inside the PWRX CM600HA-24H

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

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