A single-phase three-level flying-capacitor PFC rectifier without electrolytic capacitors

Wenlong Qi, Sinan Li, Siew Chong Tan, S. Y. Ron Hui

Research output: Contribution to journalArticlepeer-review

26 Citations (SciVal)
104 Downloads (Pure)


A component-minimized and low-voltage-stress single-phase power factor correction rectifier without electrolytic capacitor is proposed in this paper. Component minimization is achieved by embedding an active pulsating-power-buffering (PPB) function within each switching period, such that typical add-on power electronic circuits for PPB are no longer needed. Additionally, with a three-level flying-capacitor configuration, the voltage stresses of switching devices can be reduced more than 50% as compared to existing solutions that are based on embedded PPB. The relationship between the inductance requirement and the patterns of the modulation carriers, and how it can be utilized to minimize the magnetics of the rectifier, is also discussed. A 110 W hardware prototype is designed and tested to demonstrate the feasibilities of the proposed rectifier. An input power factor of more than 0.97, peak efficiency of 95.1%, and an output voltage ripple of less than 4.3% across a wide load range have been experimentally obtained.

Original languageEnglish
Pages (from-to)6411-6424
Number of pages14
JournalIEEE Transactions on Power Electronics
Issue number7
Early online date20 Sept 2018
Publication statusPublished - 1 Jul 2019


  • PFC rectifier
  • active power decoupling
  • automatic power decoupling
  • three-level flying capacitor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


Dive into the research topics of 'A single-phase three-level flying-capacitor PFC rectifier without electrolytic capacitors'. Together they form a unique fingerprint.

Cite this