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Enhanced Modulation Strategy for a Three-Phase Dual Active Bridge—Boosting Efficiency of an Electric Vehicle Converter | IEEE Journals & Magazine | IEEE Xplore

Enhanced Modulation Strategy for a Three-Phase Dual Active Bridge—Boosting Efficiency of an Electric Vehicle Converter


Abstract:

Three-phase dual active bridge (3p-DAB) dc-to-dc converters are typically avoided in low-power applications especially for wide voltage and power ranges. Even so, the 3p-...Show More

Abstract:

Three-phase dual active bridge (3p-DAB) dc-to-dc converters are typically avoided in low-power applications especially for wide voltage and power ranges. Even so, the 3p-DAB do offer a means to reduce filter costs and volume. The aim of this study is to propose the triangular and trapezoidal modulation for the 3p-DAB to address the problem of poor partial load efficiency. The proposed modulation schemes were compared with two conventional DAB concepts. It was found that the efficiency of the 3p-DAB increased substantially. Moreover, the 3p-DAB showed a considerably lower filter volume than that of the single-phase dual active bridge converter (1p-DAB). In conclusion, a modulation strategy combining the two proposed modulation schemes with the phase-shift modulation is ideal, because they boost efficiency and take most benefit from the inherent low filter volume. Ultimately, the three-phase dual active bridge may offer a promising solution to miniaturize galvanically isolated dc-to-dc converters for electric vehicles.
Published in: IEEE Transactions on Power Electronics ( Volume: 28, Issue: 12, December 2013)
Page(s): 5499 - 5507
Date of Publication: 08 March 2013

ISSN Information:


I. Introduction

In electric vehicles, batteries with voltages of around 100–450 V are used to feed the drive train. While the exact range of this voltage is still under discussion, these systems have already appeared in automotive electronics. Undoubtly, the conventional 12 V on-board system is still necessary due to safety considerations for drivers and mechanics. Besides, the 12 V level represents an important link to conventional combustion engine cars with respect to economy of scale.

References

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