A Six-level Flying Capacitor Multi-level Converter for Single Phase Buck-type Power Factor Correction

Enver Candan, Nathan Brooks, Andrew Stillwell, Rose Abramson, Johan Strydom, Robert Carl Nikolai Pilawa Podgurski

Research output: Contribution to journalArticlepeer-review

Abstract

This work investigates behavior of flying capacitor multi-level (FCML) converters in single phase buck-type power factor correction (PFC) applications. Recent developments in FCML converters using GaN transistors are leveraged to improve power density of a single-phase 240 V RMS ac to direct 48 V dc conversion stage in data center power delivery applications. Here, we experimentally demonstrate this concept in a digitally controlled six-level FCML converter hardware prototype. The experimental prototype can deliver 4.5 A average output current at 48 V, resulting in 216 W output power. A key contribution of this work is experimental demonstration of an FCML buck converter in a single-phase PFC application where the flying capacitor voltages follow fractions of the rectified input voltage by swinging at twice-line frequency.

Original languageEnglish (US)
JournalIEEE Transactions on Power Electronics
DOIs
StateAccepted/In press - 2021

Keywords

  • Bucktype Power Factor Correction
  • Capacitors
  • Density measurement
  • Flying Capacitor Multilevel Converters
  • Power system measurements
  • Prototypes
  • Reactive power
  • Server Power Delivery
  • Switches
  • Voltage

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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