Preprint Article Version 1 NOT YET PEER-REVIEWED

Design and Optimization of an Efficient (96.1%) and Compact (2 kW/dm3) Bidirectional Isolated Single-Phase Dual Active Bridge Ac–Dc Converter

  1. Department of Electrical Engineering, Electromechanics and Power Electronics (EPE) group, Eindhoven University of Technology (TU/e), 5600 MB Eindhoven (Postbox 513), The Netherlands
Version 1 : Received: 14 August 2016 / Approved: 15 August 2016 / Online: 15 August 2016 (11:06:09 CEST)

A peer-reviewed article of this Preprint also exists.

Everts, J. Design and Optimization of an Efficient (96.1%) and Compact (2 kW/dm3) Bidirectional Isolated Single-Phase Dual Active Bridge AC-DC Converter. Energies2016, 9, 799. Everts, J. Design and Optimization of an Efficient (96.1%) and Compact (2 kW/dm3) Bidirectional Isolated Single-Phase Dual Active Bridge AC-DC Converter. Energies2016, 9, 799.

Journal reference: Energies 2016, 9, 799
DOI: 10.3390/en9100799

Abstract

The growing attention for plug-in electric vehicles, and the associated high-performance demands, have initiated a development trend towards highly efficient and compact on-board battery chargers. These isolated ac-dc converters are most commonly realized using two conversion stages, combining a non-isolated power factor correction (PFC) rectifier with an isolated dc-dc converter. This, however, involves two loss stages and a relatively high component count, limiting the achievable efficiency and power density and resulting in high costs. In this paper a single-stage converter approach is analyzed to realize a single-phase ac-dc converter, combining all functionalities into one conversion stage and thus enabling a cost-effective efficiency and power density increase. The converter topology consists of a quasi-lossless synchronous rectifier followed by an isolated dual active bridge (DAB) dc-dc converter, putting a small filter capacitor in between. To show the performance potential of this bidirectional, isolated ac-dc converter, a comprehensive design procedure and multi-objective optimization with respect to efficiency and power density is presented, using detailed loss and volume models. The models and procedures are verified by a 3.7 kW hardware demonstrator, interfacing a 400 V dc-bus with the single-phase 230 V, 50 Hz utility grid. Measurement results indicate a state-of-the-art efficiency of 96.1% and power density of 2.2 kW/dm3, confirming the competitiveness of the investigated single-stage DAB ac-dc converter.

Subject Areas

ac–dc power converters; battery chargers; dual active bridge; DAB; optimal design; power MOSFETs; single-stage

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