Implementation of Microcontroller Based Asymmetric Three-Level Single-Phase Inverter

Abstract

Switching-mode single-phase DC-AC inverters have been widely used in many applications such as AC motor drivers and uninterrupted power supply systems. Among various control techniques, microcontroller based control is the most effective one generally used to regulate the magnitude as well as frequency of the converter's output voltage. In this project, an open-loop asymmetric three-level inverter with a microcontroller based control approach is established. This novel topology with a microcontroller based control approach has advantages of low voltage device, less harmonics and power loss, and more flexible device selection, compared with conventional single phase H-bridge inverter and NPC inverter. Theoretical analysis is discussed in this report. Experimental implementation based on microcontroller is also performed and the results are demonstrated in this project.