A Single Source Quadruple Boost Nine-Level Switched-Capacitor Inverter With Reduced Components and Continuous Input Current

Abstract

The multilevel inverter (MLI) serves as a pivotal class of power electronic converters, well-suited for high-power applications at medium voltage levels, ensuring superior power quality. While designing an MLI, there is a motif among the number of components, voltage stress on the semiconductor devices, and its voltage-boosting ability. A single source nine-level switched-capacitor based novel inverter with reduced components has been proposed in this paper. The proposed H-bridge based switched capacitor inverter topology employs nine switches, two capacitors, two diodes, and one DC source. The inverter has a quadruple voltage boost and the ability to draw continuous input current from the DC supply and self-voltage balance with a voltage ripple of less than $\bf {5\%}$ . A comprehensive study of performance parameters, design consideration, and loss analysis of the proposed inverter is also incorporated. A level-shifted pulse width modulation technique is implemented to operate the inverter for unity to $\bf {0.5}$ lagging load power factors and $\bf {1-0.2}$ modulation indices. The dynamic responses of the proposed switched capacitor inverter topology are obtained through MATLAB simulation for analysis and further validated by hardware prototype.

Keywords

• Continuous input current
• reduced components
• switched capacitor
• voltage stress
• voltage boost