# High-Performance Multi-Level Inverter with Symmetry and Simplification

## TL;DR

This paper introduces a new seven-level inverter design that uses a single power supply and offers high performance through symmetry and simplification.

## Contribution

A novel single-phase, seven-level symmetric switched-capacitor inverter with a voltage gain of three using a single DC supply.

## Key findings

- The proposed inverter achieves seven voltage levels using a single DC supply and double voltage clamping.
- Stability analysis and controller design were successfully performed using state-space averaging.
- Simulation and FPGA-based experiments confirmed the feasibility and effectiveness of the design.

## Abstract

This paper presents a high-performance, multilevel inverter with symmetry and simplification. This inverter is a single-phase, seven-level symmetric switched-capacitor inverter based on the concept of the double voltage clamping circuit connected to the half-bridge circuit. Above all, only a single DC power supply is used to achieve a single-phase inverter with seven levels and a voltage gain of three. In addition to analyzing the operating principle of the proposed switched-capacitor multilevel inverter in detail, the stability analysis and controller design are carried out by the state-space averaging method. The feasibility and effectiveness of the proposed structure are validated by some simulated results based on the PSIM simulation tool and by some experiments using FPGA as a control kernel, respectively. However, in this study, the switches were implemented by MOSFETs to meet a high switching frequency. These MOSFETs can be replaced by IGBTs in the motor drive applications so that the used switching frequency can be reduced.