In order to do a 30kW load bank out of 1kW power resistors, I wanted to fabricate small "control modules" that would commutate each resistor (around 36V/30A on each) through a power MOSFET.
The command would come from a µC with a MUX. Each MUX output would be connected to the entry of an optocoupler that would himself saturate the gate of a N-Channel MOSFET (through a PNP transistor, the optocoupler output being NPN).
I'm attaching a first "draft" that I wanted to submit to you guys in order to have some feedback and maybe know whether I'm completely wrong and out of line with my design (If I can call putting 4 discretes together that).
Thanks for the feedback!