A Compact Nine-Level Boost Multilevel Inverter Using Novel Switching Control

Switched-capacitor multilevel inverters (SCMLIs) have gained considerable attention in various power conversion applications due to their inherent voltage boosting capability and reduced component count, eliminating the need for auxiliary sources, transformers, or inductors. This paper proposes a novel nine-level compact boost multilevel inverter (NCBMLI) that employs only ten switches, two capacitors, and a single DC input source to achieve a voltage gain of twice the input voltage. The proposed topology is designed for compactness and cost-effectiveness by minimizing the number of active components per voltage level. Further, to operate the proposed NCBMLI a novel fuzzy logic switching method is implemented, offering a flexible alternative to conventional control methods based on static logic circuits and pre-defined lookup tables. This method utilizes rule-based membership functions (MFs) to generate adaptive switching signals, which enhances the overall performance. A detailed comparative analysis is presented to highlight the advantages of the proposed NCBMLI. Furthermore, the effective performance of the proposed NCBMLI is validated through hardware implementation under varying dynamic load conditions and modulation indices.