The idea is to take 3 phase from alternator and rectifier and regulate it to 48VDC output, this will supply systems avionics.
In the other direction battery will supply 48vdc to the alternator +starter for electric motor.
PLS advise for AC2DC include: rectifier with bridge 3 phase(MOSFET) and commutator :
Input voltage 40VDCto 400VDC.
Output voltage 48VDC .
Output current 100A.
Commutator output voltage 48VDC and current output 100A.
Reading current and voltage.
OVP,OCP,OTP etc.