Highly-Efficient Three-Level AC-AC Converter with Identical In-Phase and Anti-Phase Buck-Boost Operations

Hafiz Furqan Ahmed, Ashraf Ali Khan, Omar Al zaabi, Seyyed Mohammad Javad Mousavi, Ebrahim Babaei

Research output: Contribution to journalArticlepeer-review


In this article, a new coupled-inductors based three-level bipolar buck-boost ac-ac converter is proposed. The proposed converter can produce highly efficient and symmetric in-phase and antiphase buck and boost modes of operation with much lower component voltage and current stresses. This reduces the operation and design complexity, and helps to achieve a high-efficiency operation. The high-frequency modulating switches of the proposed converter are implemented with coupled-inductor-based dual-buck phase leg, producing three-level input and output voltages, and providing inherent protection from voltage-source short-circuit issue during switch transitions. The other salient features of the proposed converter are no-commutation issue, no need for RC snubbers or dedicated safe-commutation algorithms, provision of high-quality and continuous input/output currents, and support for nonresistive loads. An in-depth circuit analysis of the proposed converter is provided based on the proposed switch modulation strategies. The guidelines for component design/selection are discussed, followed by the comparisons with state-of-the-art three-level ac-ac converters. Finally, practical circuit verifications are performed on a laboratory-assembled prototype.

Original languageBritish English
Pages (from-to)9929-9942
Number of pages14
JournalIEEE Transactions on Power Electronics
Issue number8
StateAccepted/In press - 2024


  • AC-AC conversion
  • buck-boost voltage
  • coupled-magnetics
  • in-phase/anti-phase output
  • three-level voltages


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