Extension of soft-switching region of dual-active-bridge converter by a tunable resonant tank

M. Yaqoob, Ka Hong Loo, Y. M. Lai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

47 Citations (Scopus)


Hard-switching-induced switching loss can contribute significantly to the power loss of an isolated bidirectional dual-active-bridge (DAB) dc-dc converter operating at high frequency. An $LC$-type series resonant DAB converter based on a switch-controlled-inductor (SCI) is proposed to mitigate the loss arising from hard switching under wide-range variations in output voltage and current. Zero-voltage switching is achieved at the primary side (high voltage), while at the secondary side (low voltage), zero-current switching is preferred to reduce excessive ringing due to circulating current and switching loss. In order to achieve reduced conduction loss, a nominal operating point is chosen where the root-mean-square resonant tank current is the minimum. To validate the proposed topology and modulation scheme, an $LC$-type series resonant DAB converter based on SCI operating at 100 kHz is designed to interface a 400-V dc bus to a supercapacitor-based energy storage. Simulation and experimental results validate the effectiveness of the proposed topology for charging/discharging a supercapacitor with an output voltage variation of between 10 and 48 V and a maximum rated power of 480 W. A maximum efficiency of 94.6% is achieved using the proposed topology and modulation scheme.
Original languageEnglish
Article number7820224
Pages (from-to)9093-9104
Number of pages12
JournalIEEE Transactions on Power Electronics
Issue number12
Publication statusPublished - 1 Dec 2017


  • Dual-active-bridge (DAB) converter
  • supercapacitor
  • switch-controlled inductor
  • zero-current switching (ZCS)
  • zero-voltage switching (ZVS)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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