A Class-E-Based Resonant AC-DC Converter with Inherent PFC Capability

Hussein Mahdi, Ahmed Morsi Ammar*, Yasser Nour, Michael A. E. Andersen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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This paper investigates the use of the class-E inverter for power factor correction (PFC) applications. Analytical and state-space models are derived showing the class-E inverter’s capability of achieving inherent PFC operation with a constant duty cycle. The inherent PFC operation limits the controller responsibility to the regulation of the output voltage, which is key for resonant converters with challenging control. A converter incorporating a diode bridge, a class-E inverter, and a class-D rectifier is presented for the PFC stage in single-phase offline converters. A prototype is designed to validate the
analysis and presented design method. The prototype operates with zero-voltage switching (ZVS) across the load range and achieves up to 211W of output power at an efficiency of 88 %, with an inherent power factor of 0.99 and a total harmonic distortion (THD) of 8.8 %. Frequency modulation is used to achieve lower output power down to 25W, with a power factor of 0.95, THD of 28 %, and an efficiency of 88 %.
Original languageEnglish
JournalIEEE Access
Number of pages11
Publication statusAccepted/In press - 2021


  • AC-DC power conversion
  • Class-E inverter
  • Power factor correction
  • Resonant power conversion
  • Zero-voltage switching

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