Quote:
Originally Posted by mfox
Hello ,
I'm able to get 4 IGBT-s FF300R12KE3 cheap from scrap yard taken from some industrial device.
Those are rated as 300A and 1200V . Those will produce too much heat at 1000A peak (or 1200) compared with 3x of CM600DY-12NF ???
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Maybe I am over simplifying, but here is my take.
For the 4@ 300 amp IGBTs:
Avg current per device = 1000amps /4 = 250amps
From the first graph in the FF300R12KE3 pdf, voltage drop at 250amps = 1.7volts
So waste heat generated = 4 x 250amps x 1.7volts =1700 watts
For the 3@ 600 amp IGBTs:
Avg current per device = 1000amps /3 = 333amps
From the first graph in the CM600DY-12NF pdf, voltage drop at 330amps = 1.75volts
So waste heat generated = 3 x 333amps x 1.75volts =1750 watts
The 3-600 amp IGBTs are much more robust of course, but the waste heat generated should be similar.