zombiess wrote:Very nice Arlo1. Those caps look good and the circle based layout looks really good for sharing current.
Are you going to start stacking layers to increase power density with more parallel devices?
Thank you very much. I have had this on my bench for a long time and I decided I need to get it done.
I have some ideas on how to add more fets or IGBTs in parallel but I have not sorted out how to mount them when positioned in a different manner.
The trick is to keep 1 layer because the top of the board has a drain trace under the fets and a source trace on the bottom of the board to connect to the piece of aluminum (can use copper) below it. Making it laminated. As well keeping the top aluminum + buss circle and the bottom smaller - buss circle as close as you can keeps the positive and negative laminated to some extent.
But adding a few more fets and growing the circle is not to hard.
If you can current share properly we should be able to make this thing run at 160 amps rms per fet/igbt (leg limits for a 247/264 package) for a 10-30 second burst. With 8 150v rated fets we are talking
1280rms phase amps at 102v nominal would should be able to push 1200-1400 DC amps depending on field weakening that's 122400-142800 watts !
But when you up the voltage by simply swapping out the fets for IGBTs and re-tuning the driver to say 360 nominal we are looking at up to 504000 watts!