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A Resonant Switched-Capacitor Voltage Equalizer Circuit for Series-Connected Battery Cells
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Reza Beiranvand ,
Mohammad Monfared
IEEE Access, Volume: 13, Pages: 212745 - 212759
Swansea University Author:
Mohammad Monfared
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Copyright 2025 The Authors. This work is licensed under a Creative Commons Attribution 4.0 License.
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DOI (Published version): 10.1109/access.2025.3644890
Abstract
Conventional switched-capacitor voltage-equalizer circuits have several limitations, including low balancing speed as the number of battery-pack cells increases, capacitor inrush currents, and EMI noise. A voltage-equalizer circuit that uses a resonant structure to improve performance is proposed to...
| Published in: | IEEE Access |
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| ISSN: | 2169-3536 |
| Published: |
Institute of Electrical and Electronics Engineers (IEEE)
2025
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa71288 |
| Abstract: |
Conventional switched-capacitor voltage-equalizer circuits have several limitations, including low balancing speed as the number of battery-pack cells increases, capacitor inrush currents, and EMI noise. A voltage-equalizer circuit that uses a resonant structure to improve performance is proposed to address these issues. It includes a small optimal capacitor network, which transfers energy from any-cell-to-any-cell (AC2AC) in a battery pack, ensuring constant balancing speed, regardless of the number of cells or their initial voltage distribution. Additionally, soft-switching conditions are provided to reduce switching losses and EMI noise, which ultimately increase converter efficiency and make it possible to increase the switching frequency. Consequently, the passive-component volumes are effectively reduced and high power density is practically available. The proposed circuit has been mathematically analyzed and simulated using PSpice for six series-connected battery cells. Its prototype circuit has also been implemented to confirm the analyses and simulation results, which provides an efficiency of 94.6%. Finally, it has been compared with previously introduced structures, which clearly shows a significant improvement in balancing speed, for instance, 70% and 56% improvement as compared to the mesh and delta structures, respectively. |
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| College: |
Faculty of Science and Engineering |
| Start Page: |
212745 |
| End Page: |
212759 |