A Fault-Tolerant T-Type Multilevel Inverter Topology with Increased Overload Capability and Soft-Switching Characteristics

Jiangbiao He, Ramin Katebi, Nathan Weise, Nabeel A.O. Demerdash, Lixiang Wei

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


The performance of a novel three-phase four-leg fault-tolerant T-type inverter topology is introduced in this paper. This inverter topology provides a fault-tolerant solution to any open-circuit and certain short-circuit switching faults in the power devices. During any of the fault-tolerant operation modes for these device faults, there is no derating required in the inverter output voltage or output power. In addition, overload capability is increased in this new T-type inverter compared to that in the conventional three-level T-type inverter. Such increase in inverter overload capability is due to the utilization of the redundant leg for overload current sharing with other main phase legs under healthy condition. Moreover, if the redundant phase leg is composed of silicon carbide metal-oxide-semiconductor field-effect transistors, quasi-zero-voltage switching, and zero-current switching of the silicon insulated-gate bipolar transistors (IGBTs) in the conventional main phase legs can be achieved at certain switching states, which can significantly relieve the thermal stress on the outer IGBTs and improve the whole inverter efficiency. Simulation and experimental results are given to verify the efficacy and merits of this high-performance fault-tolerant T-type inverter topology.

Original languageEnglish
Article number7845645
Pages (from-to)2826-2839
Number of pages14
JournalIEEE Transactions on Industry Applications
Issue number3
StatePublished - May 1 2017

Bibliographical note

Funding Information:
Manuscript received August 9, 2016; revised December 27, 2016; accepted January 23, 2017. Date of publication February 7, 2017; date of current version May 18, 2017. Paper 2016-IPCC-0496.R1, approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS by the Industrial Power Converter Committee of the IEEE Industry Applications Society. This work was supported in part by the U.S. National Science Foundation (NSF) under Grant NSF-GOALI #1028348 and in part by ANSYS, Inc.

Publisher Copyright:
© 2017 IEEE.


  • Fault-tolerant operation
  • Si/SiC hybrid phase legs
  • T-type inverter
  • load current sharing
  • soft switching

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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