A Wide Input Voltage Range Switched-Capacitor Multilevel Inverter Based on Adjustable Number of Output Levels

This article presents a wide input voltage range switched-capacitor multilevel inverter based on an adjustable number of output levels. Through different modulation strategies, the number of output levels in the inverter has five possibilities, including 9, 11, 13, 15, and 17 levels. Therefore, when the input voltage varies, the inverter can correspondingly adjust the number of output levels to remain the sinusoidal output voltage constant. In this article, the modulation strategies and operation principle of the inverter under all the possible numbers of output levels are analyzed in detail. Subsequently, a prototype of the inverter is designed and the experimental results with different input voltages are also provided to validate the inverter effectiveness.