New bridgeless DCM sepic and Cuk PFC rectifiers with low conduction and switching losses

Ahmad J. Sabzali, Esam H. Ismail, Mustafa A. Al-Saffar, Abbas A. Fardoun

Research output: Contribution to journalArticlepeer-review

248 Citations (Scopus)


New bridgeless single-phase ac-dc power factor correction (PFC) rectifiers based on Sepic and Cuk topologies are proposed. The absence of an input diode bridge and the presence of only two semiconductor switches in the current flowing path during each switching cycle result in less conduction losses and improved thermal management compared to the conventional Sepic and Cuk PFC converters. The proposed topologies are designed to work in discontinuous conduction mode (DCM) to achieve almost unity power factor in a simple and effective manner. The DCM operation gives additional advantages such as zero-current turn-on in the power switches, zero-current turn-off in the output diode and reduces the complexity of the control circuitry. The proposed rectifiers are theoretically investigated. Performance comparisons between the proposed and conventional Sepic PFC rectifiers are performed. Simulation and experimental results are provided for a design example of a 65-W/48-V at 100- Vrms line voltage to evaluate the performance of the proposed PFC rectifier.

Original languageEnglish
Article number5688451
Pages (from-to)873-881
Number of pages9
JournalIEEE Transactions on Industry Applications
Issue number2
Publication statusPublished - Mar 2011


  • Bridgeless rectifier
  • Cuk converter
  • Sepic converter
  • power factor correction (PFC)
  • rectifier
  • total harmonic distortion (THD)

ASJC Scopus subject areas

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


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