Re: OLTC - Inside the PWRX CM600HA-24H

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

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

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