DC TO AC MULTI LEVEL INVERTER USING BI-DIRECTIONAL SWITCH

Abstract: This paper report on new multilevel inverter uses five controlled switches, eight diodes and two capacitors to get five level ac output. The new inverter uses five controlled switches as other Multi level inverters use eight controlled switches. Multilevel inverters offer high power capability associated with lower output harmonics and lower commutation losses. Their main drawback is their complexity, requiring a great number of power devices and passive components, and a rather complex control circuitry. This work presents a new multilevel inverter topology using an H-bridge output stage with a bidirectional auxiliary switch. The proposed topology attains an multi-level output with 37.5% reduction of main switches required as compare with conventional multi-level inverters. The circuit is simulated using MATLAB Simulink software.

Keywords: H-Bridge Inverter, Auxiliary switch, Total Harmonic Distortion.