A modular switched-capacitor multilevel inverter featuring voltage gain ability

• Published in: JOURNAL OF POWER ELECTRONICS Vol. 23; no. 1; pp. 11 - 22
• Main Authors: Wang, Yaoqiang, Ye, Juncheng, Ku, Ruohan, Shen, Yuchen, Li, Gen, Liang, Jun
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.01.2023; 전력전자학회
• Subjects: Electrical Machines and Networks; Engineering; Original Article; Power Electronics; 전기공학; Voltage stress; Voltage gain; Switched-capacitor; Multilevel inverter
• DOI: 10.1007/s43236-022-00508-9
• ISSN: 1598-2092

This article presents a modular switched-capacitor multilevel inverter which uses two capacitors and a single dc source to obtain triple voltage gain. It is worth noting that the inherent inversion capacity removes the H-bridge, which can efficaciously diminish the voltage stress of switches, and the maximum voltage stress (MVS) on devices is kept within 2 V dc . Additionally, the proposed topology is able to integrate inductive load, and the capacitor voltage self-balancing can be achieved. Moreover, the modular structure also has an expandable topology which can generate more levels and raise the voltage gain by using multiple switched-capacitor units, meanwhile the voltage stress on power switches can be kept within 2 V dc . Furthermore, comprehensive analysis and comparison with other multilevel inverters have been implemented to certify the superiority of the proposed topology. Finally, the steady-state and dynamic performance of the proposed topology is examined through a seven-level inverter prototype, the validity and practicability of the topology are verified by simulations and experiments.