Quote:
Originally Posted by GriffinRU
Very nice post, Five-oh-joe 
More fet's bigger foot print more surface area to dissipate heat, more overall losses...
Fet's driver need to be very nice or need to be on each FET's board, but try to sync them...possible.
Let's do quick theoretical calc, if you can drive fet's as fast as fet can switch (non-real) then 300 fet's you meant total, so 50 fet's per leg/100 fet's per phase. Dynamic losses would be ~10W on fet and ~10W on diode, check attached image. With 3 phases your loss would be ~60W just for switching at 15kHz PWM, that would cook ESC pretty fast without proper heatsinking, by the way can be a nice heater :)
It would be nice to keep dynamic losses matched to pcb heat dissipation capacity.
I am pretty sure, Patrick can add/correct my post if required. |
Artur,
What I was getting at is basically looking at the Tekin R1 controllers. They are small and pack a lot of FET for the space so if we were to make them a little bigger and add more FETs, would that make the FETs work less to produce the same power and thus having less or the same amount of heat? I own a Etti 200A controller and I ran it a few times. This controller is only rated for 5S lipos and I ran 5S on it and the controller didn't even get warm. This controller doesn't have a heat sink like most car controllers and I was surprised on how cool it was. My set up at the time only pulled 98A spikes, but I ran my truggy for 7 minutes. The one picture in my previous post shows a 6 power board controller that puts out a lot of AMPs. Something like that would be great for the surface side of the hobby.
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