Link to Previous Proposed Changes for Pre-Charge:
Link:
New Suggestions
Motor controller capacitors are currently charged with a constant voltage source and series resistor. This is always 50% efficient. For a challenger vehicle, it might be better to have a switching circuit (buck topology) to charge with constant current (which would also be faster).
Keep to 12V by removing DC DC inversion
Add hall effect sensor
Make simpler by removing irrelevant portions (e.g. fan control and thermistor may have been exclusive to MOV since shorts less of an issue?)
Research Summary
Simplify Isolated DCDC
U4
Original
Charge pump switch regulator
https://www.digikey.ca/en/products/detail/microchip-technology/tc7662beoa713/418710
New Change
U5
Original
New Change
https://electronics.stackexchange.com/questions/582157/alternative-to-optocoupler-in-circuit-design
Inductive coupler
RF coupler
Capacitive coupler
U9
Smaller changes
Removing:
Fan control
Remove fan connector
Remove entire fan control sheet
Thermistor
Remove thermistor connector
Remove entire thermistor sheet
Add jumpers near AND gate to skip it