Author Topic: Up to 9 half-bridges of FS35R12 IGBTs in parallel, per board...  (Read 689 times)

Offline Mads Barnkob

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Up to 9 half-bridges of FS35R12 IGBTs in parallel, per board...
« on: October 08, 2018, 09:25:14 PM »
obvious click-bait head line, but I got no plans... so what to call to it :)

I got these inverter boards from a large 60 kVA UPS system where each cabinet had 4 of these modules inside.

It consisted of 10 FS35R12 IGBT bricks, which is a 3 phased full bridge module, but here they used 2 of these modules for a halfbridge where all 3 "halfbridges" inside the module was used in parallel.

There is a common DC bus supply for the 3 phases, the other 2 halfbridge inverters was either PFC or intermediate inverters, so I removed those and I now have a board with 3 halfbridges that consists of 3 parallel halfbridges.

So if I parallel these 3 outputs I would have 9 parallel halfbridges where each igbt die is rated for 70 Apeak, which is a little low, but with the huge thermal mass that 9 parallel bridges gives, this could properly be pushed above 100A without too much trouble.

At these low peak currents I think there is only one plan for these boards, a QCWDRSSTC. I could try even longer than normal on-times due to the low peak current or as I have 5 of these boards and extra IGBT modules, I could run 2 or more interleaved to allow more time for cooling.



Anyone got comments or suggestions to this plan?
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Up to 9 half-bridges of FS35R12 IGBTs in parallel, per board...
« on: October 08, 2018, 09:25:14 PM »

 


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