A Family of Single-Switch High Step-Up DC-DC Converters Based on Switched-Capacitor Converters

Yu Fu, Shouxiang Li*, Suli Zou, Xiaolu Lucia Li, Jingxi Yang, Guoju Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, a family of single-switch high step-up DC-DC converters based on switched-capacitor (SC) cells and coupled inductor (CL) or built-in transformer (BIT) is proposed. By replacing one active switch in the 3X-ladder switched-capacitor converter (SCC) with the primary side of a CL or BIT whose secondary side is incorporated into a multiplexed current path, the proposed topology integrates the high power-density feature of a ladder SCC with the voltage-lift effect of a CL or BIT. In addition, the problems of high current spikes and limited efficiency in the voltage regulation range of the traditional ladder SCC are tackled, making them suitable for distributed generation systems, microgrids, and so forth. For illustration purposes, the performance of the topologies within the family is compared in multiple ways, detailed operation principles and design considerations of one specific converter are given. Finally, experimental results are presented to verify the analytical findings.

Original languageEnglish
JournalInternational Journal of Circuit Theory and Applications
DOIs
Publication statusAccepted/In press - 2024

Keywords

  • built-in transformer
  • coupled inductor
  • DC-DC converter
  • switched capacitor

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