Multi-Port Zero-Current Switching Switched-Capacitor Converters for Battery Management Applications

Yat Chi Fong, Ka Wai Eric Cheng, S. Raghu Raman and Xiaolin Wang
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Yat Chi Fong: Power Electronics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Ka Wai Eric Cheng: Power Electronics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
S. Raghu Raman: Power Electronics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Xiaolin Wang: Power Electronics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China

Energies, 2018, vol. 11, issue 8, 1-17

Abstract: A novel implementation of multi-port zero-current switching (ZCS) switched-capacitor (SC) converters for battery management applications is presented. In addition to the auto-balancing feature offered by the SC technique, the proposed SC converter permits individual control of the charging or discharging current of the series-connected energy storage elements, such as the battery or super-capacitor cells. This approach enables advanced state control and accelerates the equalizing process by coordinated operation with the battery management system (BMS) and an adjustable voltage source, which can be implemented by a DC-DC converter interfaced to the energy storage string. Different configurations, including the single-input multi-output (SIMO), multi-input single-output (MISO) SC converters, and the corresponding altered circuits for string-to-cells, cells-to-string, as well as cells-to-cells equalizers, are discussed with a circuit analysis and derivation of the associated mathematical representation. The simulation study and experimental results indicated a significant increase in the balancing speed with the presence of BMS and closed-loop control of cell currents.

Keywords: battery management system (BMS); switched-capacitor (SC); energy storage system; voltage balance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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