21 Level Asymmetric Inverter without Inversion Circuit with Reduced Switch Count for BLDC Motor Drive

Abstract

Design for asymmetrical Multi-Level Inverter without H-bridge and with minimal number of switch is presented in this paper. The proposed circuit is capable of generating 21 levels with only 10 switches and 3 unequal D.C. voltage sources. Operation of the proposed circuit is discussed in detail in this paper and there by framing the switching sequence for the proposed circuit. Simulation of the presented inverter is done for loads like resistive, reactive and induction motor. From the simulation results, inverter performance is analyzed in terms of THD.