Dynamic Level Selection for Full Range ZVS in Flying Capacitor Multi-Level Converters

Margaret E. Blackwell, Andrew Stillwell, Robert C.N. Pilawa-Podgurski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a control technique for flying capacitor multi-level (FCML) converters to achieve zero-voltage switching (ZVS) across the full range of duty cycles, with application in high power density and high efficiency power converters. Previous works have used variable frequency control to enable ZVS at specific duty cycles in FCML converters, but have not been able to use these methods to allow ZVS across the full range. This work uses dynamic level selection and variable frequency control to increase inductor current ripple at duty cycle ranges for which ZVS was previously unattainable. An experimental 5-level FCML prototype has been built using GaN devices on a single-sided PCB to demonstrate this control technique. We demonstrate 4-level and 5-level operation with ZVS at duty cycles that are not possible with 5-level operation alone, as well as a dynamic level transition with active capacitor voltage balancing.

Original languageEnglish (US)
Title of host publication2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781538655412
DOIs
StatePublished - Sep 10 2018
Event19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018 - Padova, Italy
Duration: Jun 25 2018Jun 28 2018

Publication series

Name2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018

Other

Other19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018
CountryItaly
CityPadova
Period6/25/186/28/18

ASJC Scopus subject areas

  • Modeling and Simulation
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Control and Optimization

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