Multi-port zero-current switching switched-capacitor converters for battery management applications

Yat Chi Fong, Ka Wai Eric Cheng, S. Raghu Raman, Xiaolin Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


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.

Original languageEnglish
Article number1934
Issue number8
Publication statusPublished - 1 Aug 2018


  • Battery management system (BMS)
  • Energy storage system
  • Switched-capacitor (SC)
  • Voltage balance

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

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