Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Switched-capacitor-based high-gain DC-DC converter for fuel cell vehicle powertrain

  • Wu, Xiaogang (School of Electrical and Electronic Engineering, Harbin University of Science and Technology) ;
  • Wang, Jiulong (School of Electrical and Electronic Engineering, Harbin University of Science and Technology) ;
  • Zhang, Yun (School of Electrical and Information Engineering, Tianjin University) ;
  • Liu, Zhengxin (School of Electrical and Electronic Engineering, Harbin University of Science and Technology)
  • Received : 2021.07.21
  • Accepted : 2022.01.18
  • Published : 2022.04.20
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Abstract

A novel DC-DC converter with switched capacitor is proposed to satisfy the requirements of fuel cell vehicles for DC-DC converter in terms of step-up ratio, efficiency, and voltage stress. The proposed converter has the advantages of high step-up ratio, low voltage stress of each device, the common ground, high efficiency, and small size. It is compared with other converters in the above aspects. The dynamic model of the proposed converter can be obtained on the basis of the small-signal modeling method and the state space average method. Experimental results show that the proposed converter has a high step-up ratio under a nonextreme duty cycle state, and the highest efficiency is 94.25%. Compared with the dual-switch boost converter, the proposed converter has certain advantages in terms of step-up ratio, component voltage stress, and efficiency. Consequently, it is more suitable for the powertrain of fuel cell vehicles.

Keywords

Acknowledgement

This work was sponsored by the International Science and Technology Cooperation of China (2019YFE0100200) and the Fundamental Research Foundation for Universities of Heilongjiang Province (2018-KYYWF-1672).

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