Dual-T-Type Five-Level Cascaded Multilevel Inverter with Double Voltage Boosting Gain

Sze Sing Lee*, Chee Shen Lim, Yam P. Siwakoti, Kyo Beum Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


The switched-capacitor-based cascaded multilevel inverters (CMI) have been emerging due to their voltage boosting capability. Unfortunately, they suffer from impulse charging current and nonuniform operation. This article presents a topology termed as dual-T-type five-level CMI to resolve these problems without compromising the desirable voltage boosting characteristic. The main idea is to integrate a half bridge and an inductor to soft charge a capacitor that is connected in series with the dc source. The capacitor enables the voltage gain boosted to two, while the control of eight power switches that constitutes a dual-T structure enables five voltage levels generation. In addition, uniform operation is achieved for cascaded extensions. The operating principle of the proposed topology is analyzed and elaborated. For validation, simulation, and experimental results of a prototype are presented.

Original languageEnglish
Article number8998347
Pages (from-to)9524-9531
Number of pages8
JournalIEEE Transactions on Power Electronics
Issue number9
Publication statusPublished - 1 Sept 2020
Externally publishedYes


  • Cascaded multilevel inverter
  • Dual-T-type topology
  • Soft charging
  • Switched-capacitor
  • Voltage boosting

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