A novel voltage boosting switched-capacitor 19-level inverter with reduced component count

摘要

A dual-source switched-capacitor multilevel inverter (SCMLI) topology utilizing 13 switches, one diode, and two switched capacitors is presented in this paper. The proposed topology is capable of operating in both asymmetrical and symmetrical modes. In asymmetrical mode, it produces 19-level output voltage, whereas, in symmetrical mode, it produces 13-level output voltage. The capacitor voltages are self-balanced in the presented SCMLI topology. A detailed comparative analysis has been carried to show the advantages of the proposed topology in terms of the number of switches, number of capacitors, number of sources, and boosting of the converter with the recently published multilevel inverter topologies. The nearest level control (NLC)-based algorithm is used for generating switching signals for the IGBTs present in the circuit. The reliability assessment is carried to assess the life span of the proposed SCMLI. Experimental results are obtained for different loading conditions using a laboratory hardware prototype. The fluke-based power analyzer is used to record the inverter voltage and corresponding THD values at different modulation indexes. The efficiency of the proposed inverter is 97.35% for 200-W load.