Usually in DC input motor controllers a relay is placed in series with the power supply ( Vbat+) a resistor is connected in parallel with it. This resistor is said to be a precharge resistor for the bulk capacitance (ex: 4700uF at 48v ).
I want to eliminate the relay from this circuit , and i want to know what are my options for limiting inrush current for the bulk capacitors , which as i understand stabilized the dc link from switching and supplies peak current for motor.
My question is:
1- can i use an NTC alone and have the same performance if yes how is the selection is made ?
2- should i place a mosfet in parallel with this NTC that opens after the capacitors are charged ?
3-is there any recommended alternative ?