A modular switched-capacitor multilevel inverter featuring voltage gain ability

Wang, Yaoqiang, Ye, Juncheng, Ku, Ruohan, Shen, Yuchen, Li, Gen ORCID: https://orcid.org/0000-0002-0649-9493 and Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X 2023. A modular switched-capacitor multilevel inverter featuring voltage gain ability. Journal of Power Electronics 23 , pp. 11-22. 10.1007/s43236-022-00508-9

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Abstract

This paper proposes a modular switched-capacitor multilevel inverter with single dc source, which can obtain triple voltage gain by using two capacitors. It is worth noting that the inherent inversion capacity eliminates the Hbridge, which can effectively reduce the voltage stress of switches, and the maximum voltage stress (MVS) of all switches is kept within 2Vdc. In addition, the proposed inverter is able to integrate inductive load, and the capacitor voltage self-balancing can be achieved without any auxiliary circuits. Moreover, the modular inverter also has expandable structure which can generate more output levels and raise the voltage gain by employing multiple switchedcapacitor cells, meanwhile the MVS for all of the switches is kept within 2Vdc in the extended structure. Furthermore, comprehensive analysis and comparison with other multilevel inverter have been implemented to evaluate the superiority of the proposed topology. Finally, the steadystate and dynamic performance of the proposed inverter is validated through a seven-level inverter prototype, the correctness and feasibility of the proposed topology are verified by simulations and experiments.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Springer
ISSN:	1598-2092
Date of First Compliant Deposit:	29 June 2022
Date of Acceptance:	14 June 2022
Last Modified:	23 May 2023 23:47
URI:	https://orca.cardiff.ac.uk/id/eprint/150881

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