A Dual-Buck-Boost DC–DC/AC Universal Converter

Yao Rong Ong, Shuyu Cao, Sze Sing Lee*, Chee Shen Lim, Max M. Chen, Naser Vosoughi Kurdkandi, Reza Barzegarkhoo, Yam P. Siwakoti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This paper proposes a universal converter that is capable of operating in three modes for generating positive dc voltage, negative dc voltage, and sinusoidal ac voltage. By controlling the duty-cycle of two half-bridges, an inductor is operated at a high frequency to control the voltage across two film capacitors that constitute a dual-buck-boost converter. Two additional half-bridges operating at a fixed state or line frequency are used to select the mode of operation. Compared to the latest universal converter in the recent literature, the proposed topology has the same switch count while reducing the number of conducting switches for inductor current and reducing the number of switches operating at high frequency. The operation of the proposed dual-buck-boost dc–dc/ac universal converter is analyzed. Experimental results are presented for validation. The power conversion efficiency of the 100 W experimental prototype modeled in PLECS is approximately 98%.

Original languageEnglish
Article number1973
JournalElectronics (Switzerland)
Issue number13
Publication statusPublished - 1 Jul 2022


  • buck-boost converter
  • universal converter


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