A 7-Level Symmetric Multilevel Inverter with Minimum Numbers of Switches

This paper presents the design and implementation of a 7-level symmetric multilevel inverter (MLI) that utilizes a minimal number of switches. Traditional multilevel inverters often require a large number of power electronic components, which can increase system complexity, cost, and power losses. The proposed topology addresses these challenges by significantly reducing the number of required switches while maintaining the desired output voltage levels and waveform quality. The design methodology focuses on achieving a symmetric configuration to ensure equal voltage stress across all switching devices. The operational principles of the inverter are analyzed, and the switching sequence is optimized to generate a seven-level output with reduced total harmonic distortion (THD). The performance of the inverter is evaluated through simulation and experimental validation. Results demonstrate that the proposed 7-level symmetric MLI not only meets the output voltage requirements but also enhances overall efficiency and reliability. This topology is particularly suitable for renewable energy systems, electric vehicles, and other applications where compact, efficient, and cost-effective power conversion is essential.