Interleaved switched-capacitor bidirectional DC-DC converter with wide voltage-gain range for energy storage systems

Zhang, Yun; Gao, Yongpin; Li, Jing; Sumner, Mark

Abstract

In this paper, an interleaved switched-capacitor bidirectional DC-DC converter with a high step-up/step-down voltage gain is proposed. The interleaved structure is adopted in the low-voltage side of this converter to reduce the ripple of the current through the low-voltage side, and the series-connected structure is adopted in the high-voltage side to achieve the high step-up/step-down voltage gain. In addition, the bidirectional synchronous rectification operations are carried out without requiring any extra hardware, and the efficiency of the converter is improved. Furthermore, the operating principles, voltage and current stresses, and current ripple characteristics of the converter are analyzed. Finally, a 1kW prototype has been developed which verifies a wide voltage-gain range of this converter between the variable low-voltage side (50V-120V) and the constant high-voltage side (400V). The maximum efficiency of the converter is 95.21% in the step-up mode and 95.30% in the step-down mode. The experimental results also validate the feasibility and the effectiveness of the proposed topology.

Citation

Zhang, Y., Gao, Y., Li, J., & Sumner, M. (in press). Interleaved switched-capacitor bidirectional DC-DC converter with wide voltage-gain range for energy storage systems. IEEE Transactions on Power Electronics, https://doi.org/10.1109/TPEL.2017.2719402

• Journal Article Type: Article
• Acceptance Date: Jun 21, 2017
• Online Publication Date: Jun 23, 2017
• Deposit Date: Aug 31, 2017
• Publicly Available Date: Aug 31, 2017
• Journal: IEEE Transactions on Power Electronics
• Print ISSN: 0885-8993
• Electronic ISSN: 0885-8993
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• DOI: https://doi.org/10.1109/TPEL.2017.2719402
• Public URL: https://nottingham-repository.worktribe.com/output/867660
• Publisher URL: http://ieeexplore.ieee.org/document/7956297/
• Additional Information: ©2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works