[TCML] Re: IGBT CM600 max current ?

[Greg Leyh <lod@xxxxxxxxxxx>]

The twins currently use the CM600HB-90H, which has 4500V silicon.

We're also evaluating the CM600HG-130H, a 6500V module, in a test bed 
that operates the module at the peak voltage and current it will see in 
the full-scale design.  The 9500V silicon currently in development at 
Mitsubishi might be ready by the time we need to commit to a purchase, 
although early tests indicate silicon this thick is understandably slow.

The CM600 and CM900 series have beautifully symmetric internal buswork, 
giving the module incredible resilience against high dI/dt fault events.
Back in 2003 I studied the CM600 and other IGBT modules in detail and 
published the results in this paper:

http://www.lod.org/Leyh/Papers/IGBTPAC2003.pdf

The CM600 series is listed as 'Mfr B.'  From the lessons learned there, 
we worked with the silicon guru at Mitsubishi to construct and test 
several conceptual IGBT modules.  GL



Terry wrote:
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Greg,


A while back you gave us some details on the 1:12 scale NLL coils and 
mentioned a 3kv primary and conventional C-switch-L scheme, with IGBT's 
in place of a spark gap for improved efficiency and control. I just 
assumed you were using a monster IGBT that was rated over 3kv.

So, how are you able to use a 1200V CM600 in a conventional 3kv primary? 
Series up 3 or 4 of them? If so, are there any issues with 
over-voltaging a single IGBT because the others turn on too fast?

What else can you tell us about how it works? Do you charge up the C to 
3kv and then close the IGBTs until discharged, just like a spark gap?

Terry Blake
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