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Old 10-11-2018, 02:07 PM   #3291 (permalink)
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MHO: build and use it with what you have. Probably will exceed expectations. Otoh: better to fry existing silicon than go buy new expensive silicone to OOPS. Just ask thingstodo.

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Old 10-11-2018, 03:37 PM   #3292 (permalink)
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Originally Posted by Piotrsko View Post
Otoh: better to fry existing silicon than go buy new expensive silicone to OOPS. Just ask thingstodo.
+1 on that. But I guess it would depend on how expensive the existing silicon is that you already own
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Old 10-11-2018, 05:06 PM   #3293 (permalink)
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Quote:
Originally Posted by BogdanT View Post

On my particular application, I have some questions for the experts. I have some IGBT's lying around which I want to use for the P&S AC board running the AC35 at 144V.
They are 600V 400A Powerex CM400DY12NF and have
Sunk cost=paid for=free more or less. YMMV. WAAAY cheaper than 1800a currently on mouser
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Old 10-11-2018, 05:56 PM   #3294 (permalink)
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Quote:
Originally Posted by BogdanT View Post
More specifically the peak values are pulse values (measured in couple of ms).
The bus-voltage pulses get reflected to a lower or higher extent when they reach the change of impedance at the motor terminals .. I think that's an acceptable translation of the sort-of understandable videos that explain that stuff ...

I have seen 2.25x bus voltage at the output terminals of the IGBTs, before the turn on/turn off resistor values have been adjusted to minimize overshoot. And 2 ms is more than enough time to blow up your IGBTs
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Old 10-12-2018, 02:31 AM   #3295 (permalink)
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Quote:
Originally Posted by thingstodo View Post
The bus-voltage pulses get reflected to a lower or higher extent when they reach the change of impedance at the motor terminals .. I think that's an acceptable translation of the sort-of understandable videos that explain that stuff ...

I have seen 2.25x bus voltage at the output terminals of the IGBTs, before the turn on/turn off resistor values have been adjusted to minimize overshoot. And 2 ms is more than enough time to blow up your IGBTs
Yes that's correct about the voltage spikes, but I was referring to the AMP draw spec on the IGBT (IC max).I'll just prototype around these for now, aiming for a current limit of 350A per phase and we'll see from there.

PS: I've also gone back to the design board a bit ... might just opt for a DC series motor for the first setup (didn't buy the AC35 yet)
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Old 10-12-2018, 02:59 PM   #3296 (permalink)
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Quote:
Originally Posted by BogdanT View Post
Yes that's correct about the voltage spikes, but I was referring to the AMP draw spec on the IGBT (IC max).
I guess I read that wrong. Sorry
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Old 10-12-2018, 04:58 PM   #3297 (permalink)
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Quote:
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I guess I read that wrong. Sorry
I wasn't very clear myself there

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