I am using a 3-Phase IPM IGBT Inverter Module in motor driver. This module has built-in gate drivers which require 4 Isolated power supplies for their operation. In all I have to design 5 Isolated Power Supplies as shown in the attached drawing.
My input is 2-Phases (380V AC) and the output will be x5 regulators 7815. All 5 outputs will have isolated GND from each other. Max current from each output is less than 500 mA.
If cost is the main factor then how can this be achieved? Should I wound 1 big 50 Hz step-down transformer (380 VAC to 24 VAC) with 5 separate secondary windings or is there any better design technique than this?
The IGBT module is following: