MOSFET-based Three-Phase Inverter using Arduino - Applicable in Microgrid Systems

To address the requirement for three-phase inverters in microgrid systems or sustainable-powered industrial facilities, a MOSFET-based three-phase inverter is designed and implemented, which can convert DC power into three-phase AC. The designed system produces 223V square (AC) waves at each phase from a 12V battery (DC) through switching of three stages of power MOSFETs using PWM signals at their gates from an Arduino Uno R3. Each stage of MOSFETs consists of six MOSFETs making it eighteen in total, which are used to perform the inversion process separately for each of three single-phase connections. The system is programmed through the Arduino Uno to generate the PWM signals and to keep 120 degrees phase displacement among each phase. Three center-tapped step-up transformers are used at the outputs of MOSFET stages for signal amplification. Using a 60W incandescent light bulb at each phase as a load, the system produces 386.25 V of voltage for three-phase line, delivering 0.58A of current. The design and simulation of the electronic circuit are done by Proteus 8.9 Professional, and the programming codes are written using Arduino IDE. The designed system is practically contrasted and tested.