Multilevel Pulse Width Modulation Resonant Converter with Excellent Efficiency under a Wide Input Voltage Range

Peng Fang, Rudy E Rice

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

Abstract

Resonant converters are often considered ideal solution for fixed conversion ratio applications. They can achieve higher efficiency and lower level of noise generation as compared to other popular non-resonant topologies, such as phase shift full bridge. However, resonant converters are inherently not able to handle a wide conversion ratio because an optimal operation cannot be maintained. In this paper, a multilevel pulse width modulation method is proposed for resonant topologies to achieve a wide conversion ratio yet under fixed switching frequency operation. The implication of fixed switching frequency operation is maintaining optimal operation and alleviating EMI filter design complexity. This method is demonstrated in LLC resonant topology and can be extended to other resonant topologies as well. 600W experiment prototype had been built and tested to validate the proposed method. Excellent efficiency had been obtained under a wide 4: 1 ratio input voltage range.

Original languageEnglish (US)
Title of host publicationAPEC 2023 - 38th Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages507-513
Number of pages7
ISBN (Electronic)9781665475396
DOIs
StatePublished - 2023
Event38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023 - Orlando, United States
Duration: Mar 19 2023Mar 23 2023

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Volume2023-March

Conference

Conference38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023
Country/TerritoryUnited States
CityOrlando
Period3/19/233/23/23

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Keywords

  • Flying capacitor multilevel
  • LLC
  • Pulse Width Modulation
  • resonant converter
  • wide input voltage range

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