Highly-Efficient and Cost-Effective Ripple-Free Resonant NPC DC-DC Converter

Tsegaab Alemayehu Wagaye, Hyun Sam Jung, Minsung Kim

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This article presents highly-efficient and inexpensive ripple-free resonant neutral-point-clamped (NPC) dc-dc converter that does not use extra inductors. By using the push-pull transformer itself, with the primary-side switching modulation fixed at 0.5, the proposed converter accomplishes theoretically zero input current ripple. Because of the resonant NPC cell, the circuit does not experience instantaneous reactive current flow regardless of wide input voltage variation. The resonant NPC structure much reduces the voltage stress at the turn-off instant; this aspect enables use of inexpensive low-voltage-rated active power components. Therefore, the proposed converter is inexpensive, highly efficient, and has high power density. A 1-kW experimental prototype was implemented and it was tested to validate the superior properties of the proposed converter.

Original languageEnglish
Pages (from-to)8087-8097
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume70
Issue number8
DOIs
StatePublished - 1 Aug 2023

Keywords

  • Instantaneous reactive current
  • low cost
  • push-pull transformer
  • reduced voltage stress
  • zero input current ripple

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