|
The annoying thing is, you want the mosfets and diodes as close as possible to each other, and if you are using 10 or 12 of each of them, it eats up about 8 inches of a big heat spreader, where the mosfets and diodes are on opposite sides of the heat spreader. Most CPU coolers are too small, and I don't know about stacking them side by side. I think it would be easier to add water cooling to the heat spreader. I think the process is really easy, but we aren't aiming for 144v 1000 amps on the first try. Maybe 144v 500amp is plenty for now.
I've looked at doing synchronous rectification instead of using freewheel diodes. There are several ways of doing it. Basically, diodes waste a lot of heat. Here's a for instance. Let's say it's 500 amps, 100% duty through 10 diodes. You get waste heat of:
500 amp*1 volt = 500 Watt.
If you are sneaky, and use Synchronous Rectification instead, optimistically, the waste heat will be:
0.009Ohm/10*500amp*500amp = 225 Watt.
|