Dual-Buck Three-Switch Leg Converters With Reduced Number of Passive Components

Fazal Akbar, Usman Ali Khan, Ashraf Ali Khan, Hafiz Furqan Ahmed, Ahmad Elkhateb, Honnyong Cha, Jung Wook Park

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Like conventional two-switch leg converters, the three-switch leg converters also have short-circuit risks and a dangerous shoot-through current is generated if switches of the same leg are turned on simultaneously. In this article, a new dual-buck structure is proposed for three-switch leg converters. The proposed structure is reliable because of no shoot-through concerns and high quality of output waveforms can be obtained due to the reduction in pulsewidth modulation deadtime. Unlike the conventional dual-buck three-switch leg that uses many passive components such as four current limiting inductors and three external diodes, the new dual-buck three-switch leg uses only one current limiting inductor with two external diodes. To verify the performance, the proposed three-switch legs are used in single-phase dual-output inverter and detailed theoretical analysis, simulation, and experiments are performed. Both continuous and discontinuous modulation schemes are applied and it has been figured out that discontinuous modulation scheme can improve the dc-link voltage utilization in the common-frequency mode of operation.

Original languageEnglish
Pages (from-to)13484-13498
Number of pages15
JournalIEEE Transactions on Power Electronics
Issue number11
Publication statusPublished - 2022 Nov 1

Bibliographical note

Funding Information:
This work was supported in part by the National Research Foundation (NRF) under Grant 2020R1A3B2079407, the Ministry of Science and ICT (MSIT), South Korea; and in part by the U.K. Engineering and Physical Sciences Research Council (EPSRC) under Grant EP/T026162/1.

Publisher Copyright:
© 1986-2012 IEEE.

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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