I have optocouplers in my AVR Controlling PCB so The question is:
In order for secure protection, is it recommended to use two separate power supplies: one for the Micro-controller side and other for the optocoupler power supply? I use opto for triggering one IGBT which have its own power supply (one bridge rectifier and one capacitance without transformer), which could not be used as power supply for microcontroler or opto. Clearly i have two option: using 2 power supply, 1th as micro and optocopler power supplier and the other as IGBT power supplier line.
using 3 power supply, 1th for micro, 2th as optocopler power supplier and 3th as IGBT power supplier line.
So Could i have use one power supply instead of two power supply.