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Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I picked up two identical discarded variable frequency drives from a scrap yard.
I took some pictures while I dismantled down through the different layers of it.
One of them had suffered a fatal failure where large holes were blown in the traces around current sensing network, brake chopper switch was blown and IGBT brick was blown. The other had intact silicon parts.
So just for comparison of a healthy and a beautifully exploded IGBT I took some macro shots, all the DSC* pictures are from the tear down and the GS6* pictures are the macro shots:
Kizmo suggested that the flat flower leaf like black explosion deposits in the goo is from the explosion dispersing into the goo as bubbles that then collapses back and look flat.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
jdub1581hv wrote ...
Wish I could find things like that... lol.. The explosion turned out rather beautiful in many ways...
Have you looked back through the folder just called junk yard stuff, it is rare, but at times I do find some nice stuff, just waiting for a bigger lab/mains supply before they can be utilized :)
This explosion captured in goo is the first of its kind I have seen, mostly they are just gaping craters.
Registered Member #2906
Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727
Thx for sharing! Its amazing how the bond wires (of the middle IGBTs) got deformed even they are that thick aluminium and the goo is sooo soft and..... gooey.
What i am missing is a scale Those dies look bigger than those who fit in a TO247 package... still i bet those IGBTs are rated for less. I sometimes really dont get it. My mind boggels how the heat management is done here.. those modules (or the packages) are rated for several kW.. i dont see this happening.. Its all isolated
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
DerAlbi wrote ...
Thx for sharing! Its amazing how the bond wires (of the middle IGBTs) got deformed even they are that thick aluminium and the goo is sooo soft and..... gooey.
What i am missing is a scale Those dies look bigger than those who fit in a TO247 package... still i bet those IGBTs are rated for less. I sometimes really dont get it. My mind boggels how the heat management is done here.. those modules (or the packages) are rated for several kW.. i dont see this happening.. Its all isolated
I should have written what IGBT it was, but did not as it is shown in picture DSC_0132.JPG the complete module is about 100 mm wide, so its 555 W dissipation rating is rather normal.
Registered Member #55219
Joined: Tue Jun 09 2015, 11:21PM
Location:
Posts: 80
Mads Barnkob wrote ...
jdub1581hv wrote ...
Wish I could find things like that... lol.. The explosion turned out rather beautiful in many ways...
Have you looked back through the folder just called junk yard stuff, it is rare, but at times I do find some nice stuff, just waiting for a bigger lab/mains supply before they can be utilized :)
This explosion captured in goo is the first of its kind I have seen, mostly they are just gaping craters.
Just a shame I have no scrap/salvage yards around... Everyone is so quick to cash in on the raw materials ... :(
Registered Member #2906
Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727
Hey thanks for the update.. sry if i could find it myself.. i was naturally only interested in the closeup nude pics.. there is no point in non-nude electronics
Interesting datasheet however - i learned stuff.. i just share the couriosities: 1) ive never seen the unit µC before. only nC. Its a whole new order of Magnitude for gate Charge! 2) the 555W are indeed less than i expected. quite low. But now i understand: 1.7kV need the electrical isolation which is responsible for the thermal isolation. 2.1) Still: 550W budget for 6 IGBTs is close to be pathetic :-/ Think about the derating for an actual non-infinite non 25°C heat sink. You are left with nothing. 3) The "internal gate resistor" seems to be a welcome parasitic property I did think of it as a dedicated resistor until now. But it seems just be the bad (thin metal) gate connection. Maybe its a dedicated resistor around the gate-bond pad in poly-SI. hmmh. 4) Its first german then english. interesting priority.. why german at all?? 5) first time i have seen a "__Repetitive__ peak collector current" 6) first time i have seen a transfer characteristic that actually shows a significant difference between Vge=15V and Vge=20V in Vcesat. 7) they specify the complete transient thermal behavior with all time constants. EXTREMELY NICE. But hey.. its german But is the underlying thermal model in "foster" or "cauer" form? (does it matter? - i think so) 8) the internal diode actually has a iso-thermal point. Why so resistive??
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5kW VFD tear down and exploded IGBT macro shots
Those dies look bigger than those who fit in a TO247 package... still i bet those IGBTs are rated for less. I sometimes really dont get it. 
