Controlled transition full-bridge hybrid multilevel converter with chain-links of full-bridge cells

Peng Li, Grain Philip Adam, Derrick Holliday, Barry Williams

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)
171 Downloads (Pure)


This paper proposes a controlled transition full-bridge (CTFB) hybrid multilevel converter (HMC) for medium and high voltage applications. It employs a full-bridge cell chain-link (FB-CL) between the two legs in each phase to generate multilevel bipolar output voltage. The CTFB-HMC has twice dc voltage utilization or power density of conventional converters due to the bipolar capability of its full-bridge configuration. Hence, for the same power rating and same voltage level number, its total cells per phase are quarter that in modular multilevel converter (MMC), which reduces the hardware installation volume. Also, in the proposed converter, the total device number in the conduction paths is the same as in the half-bridge MMC, leading to low conduction losses. The FB-CL current of the CTFB converter has no dc component, which offers the potential to enhance the transient response. Comparative studies between the CTFB and other multilevel topologies are carried out to clarify its main features. The modulation strategies and parameter sizing of the proposed converter are investigated using a generic case. Simulation and experimental results are used to verify the effectiveness of the proposed approach.
Original languageEnglish
Pages (from-to)23-38
Number of pages16
JournalIEEE Transactions on Power Electronics
Issue number1
Early online date29 Jan 2016
Publication statusPublished - 1 Jan 2017


  • hybrid multilevel converter
  • full-bridge cell chain link
  • controlled transition process
  • improved DC voltage utilization
  • low conduction losses
  • zero DC chain-link current


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