Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 5, Pages 4718-4729Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3084181
Keywords
High-voltage techniques; DC-DC power converters; Batteries; Logic gates; Vehicle-to-grid; Switches; Stress; Bidirectional dc-dc converter; high voltage gain; nonisolated; semiconductor utilization factor (SUF); wide-range voltage gain
Categories
Funding
- Science Foundation Ireland [SFI/16/IA/4496]
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This article presents a new bidirectional dc-dc converter for electric vehicle applications. The converter has an improved voltage gain transfer ratio and features low-voltage switch stress, high utilization factor, and high efficiency. Additionally, a dead-beat current controller is proposed to enhance the performance and response speed of the converter.
This article proposes a new wide-range bidirectional dc-dc converter that has an improved voltage gain transfer ratio for use in electric vehicle (EV) applications. The converter preserves the common electrical ground between input and output terminals, and presents a low-voltage stress of switches, high utilization factor, and high efficiency. The proposed EV charger performance is evaluated for a bidirectional power flow in grid-connected vehicle-to-grid (V2G) and grid-to-vehicle (G2V) modes. The converter uses a dead-beat current controller in the dc-dc and dc-ac stages, which has a smooth, accurate, and fast response. Finally, experimental results for a 500 W, 40-200 V prototype are provided under a bidirectional power flow in a closed-loop system in the presence of the proposed dead-beat controllers. The obtained results substantiate the theoretical analysis and the applicability of this structure. The converter exhibits the capability for EV battery charging/discharging and demonstrates a peak efficiency of 97.2% and 96.8% in the step-down and step-up modes of operation, respectively.
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