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Old 04-12-2014, 06:58 PM   #6463 (permalink)
thingstodo
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Hi frequency switching

Quote:
Originally Posted by MPaulHolmes View Post
I wanted to do the forced current sharing way because people who will be doing this will likely just buy 3 IGBTs from Ebay, which will not likely be well matched.

4 6gauge cables might be better for B+ and B- (4 each). It's easier to find small lugs with small holes than big lugs with small holes.
If you are using 3 sets of IGBTs, at 8 Khz, I think you may be able to alternate the switching - U+, V- ... V+, W- .... W+, U- ... at 24 khz (higher than I can hear) for a 'silent' mode? Dogs may not like it much, but I think I would

There would be 3X heat since you are switching 3X as often, so it would be *BAD* for heavy acceleration. But it may be good for cruising?

Just a random thought ...
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MPaulHolmes (04-12-2014)