Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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A bidirectional DC/DC converter with wide-voltage gain range and low-voltage stress for hybrid-energy storage systems in electric vehicles

  • Wang, Zhishuang (School of Electrical and Information Engineering, Tianjin University) ;
  • Wang, Ping (School of Electrical and Information Engineering, Tianjin University) ;
  • Bi, Huakun (School of Electrical and Information Engineering, Tianjin University) ;
  • Qiu, Mingjie (School of Electrical and Information Engineering, Tianjin University)
  • Received : 2019.07.10
  • Accepted : 2019.09.21
  • Published : 2020.01.20
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Abstract

In this paper, a bidirectional non-isolated DC/DC converter for hybrid energy storage systems has been proposed. The converter is constituted by the integration of two conventional two-level topologies, with a parallel connection on their low-voltage sides (LVSs) and a series connection on their high-voltage sides (HVSs). Thus, a high-voltage gain can be achieved, along with the low-voltage stresses on power switches and capacitors. In addition, by establishing a higher charging/discharging voltage in the step-up/down mode on the inductor, the voltage gain range can be further extended. Furthermore, the operating principles, characteristics analysis, and comparisons with other converters are presented in detail. Finally, a 400 W prototype has been fabricated to further validate the feasibility and correctness of the theoretical analyses. The LVS voltage range is 20-60 V, while the HVS voltage is 200 V. The resulting voltage gain range is from 3.34 to 10. Moreover, the converter achieves high efficiency in bidirectional operations. The maximum efficiencies are 95.7% in the step-up mode and 95.9% in the step-down mode.

Keywords

Acknowledgement

This work was supported by basic research program of Qinghai province, China (2018-ZJ-764).

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