LeoDJApr 14

Currently in the process of designing the main power switch for #Torquee.
It needs to switch the 48V battery voltage at up to 500A.
I'll be using a EV200/GV200 contactor for this.
But I need a 12V supply and pre-charge circuit so I don't explode the contacts when trying to instantly charge ~8mF of input capacitance of the 2 #startergenerators to 50V in microseconds :D

So I'm designing this PCB, that'll screw on top of the cable lugs and connects to GND and actual switch input.

Show threadJakob (Jack/Jackie)
@LeoDJ that looks very elegant :D The common approach in formula student is a smaller precharge relay and a PTC resistor but there the rules forbid switching using semiconductors and we are running 600V ^^'
Apr 14 at 2:56pmWeb
Show threadLeoDJApr 14
@jakob Thanks ^^
Yeah, at that voltage I wouldn't want to rely on semiconductors that like to fail short either :D
I also thought about a second relay + resistor but opted to go for this solution first ^^