Research on Transient DC Bias Analysis and Suppression in EPS DAB DC-DC Converter

Tianli Dai, Jinggang Qin, Gao Ge, Chao Zhou*, Lican He, Jingyu Zhai, Jiangang Li

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)
39 Downloads (Pure)


During excitation and demagnetization phase for the superconducting magnet, in dual-active-bridge (DAB) converter based power supply, a dc bias may occur in high-frequency transformer and thus lead to the faults. In this paper, an improved transient extend-phase-shift (TEPS) control strategy is proposed to suppress the dc bias without any additional hardware. Unlike the traditional extend-phase-shift (EPS) strategy, the voltages of the transformer are asymmetrical for half a period after changing phase-shift and then remain symmetrical. This makes it take half a switching period for the current of transformer to reach the steady state, and then eliminates the dc bias. The experiment verifies the performance on dc bias suppression. This method provides a good theoretical and experimental basis for the EPS DAB DC-DC converter to realize the optimal control for excitation and demagnetization system in high-field superconducting magnet power supply (SMPS).

Original languageEnglish
Article number9046035
Pages (from-to)61421-61432
Number of pages12
JournalIEEE Access
Publication statusPublished - 2020


  • dc~bias
  • Dual-active-bridge (DAB)
  • high-field SMPS
  • transient extend-phase-shift (TEPS) control strategy

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