A Dual Active Bridge Converter with an Extended High-Efficiency Range by DC Blocking Capacitor Voltage Control

Zian Qin, Yanfeng Shen, Poh Chiang Loh, Huai Wang, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

28 Citations (Scopus)
109 Downloads (Pure)

Abstract

A Dual Active Bridge (DAB) converter can achieve a wide high-efficiency range when its input and output voltages are equal, assuming a 1:1 turns ratio for its isolation transformer. If its input or output voltage is doubled, efficiency of the DAB will drop significantly, because of the introduction of hard switching and high circulating power. Thus, a new modulation scheme has been proposed, whose main idea is to introduce a voltage offset across the dc blocking capacitor connected in series with the transformer. Operational principle of the proposed modulation has been introduced, before analyzing its soft-switching area and circulating power mathematically. The final modulation scheme is not difficult to implement, but can help the DAB achieve soft switching, low circulating power, and thereby high efficiency, even with its input or output voltage doubled. These features have been verified by experimental results obtained with a 1.2 kW prototype.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Volume33
Issue number7
Pages (from-to)5949-5966
Number of pages18
ISSN0885-8993
DOIs
Publication statusPublished - Jul 2018

Keywords

  • Dual active bridge converters
  • Modulation
  • High efficiency
  • Soft switching
  • Circulating power

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