Fast and Accurate Balancing Methods based on Flyback converters for Series-connected Supercapacitors

Conference: PCIM Conference 2025 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/06/2025 - 05/08/2025 at Nürnberg, Germany

doi:10.30420/566541337

Proceedings: PCIM Conference 2025

Pages: Language: englishTyp: PDF

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Authors:
Baharizadeh, Mehdi; Esfahani, Mohammad Sadegh Golsorkhi; Vindt, Steffen Thrane; Babaki, Amir; Ebel, Thomas

Abstract:
This paper investigates fast and accurate balancing methods for series-connected supercapacitors using flyback converters with two-winding transformers. Series-connection of supercapacitor cells requires voltage balancing due to electrical differences, which, if unmanaged, lead to cell degradation and reduced performance. Two flyback-based balancing circuits—unidirectional and bidirectional—are explored. While both circuits effectively balance cell voltages, the bidirectional method demonstrates significantly faster performance by directly transferring energy between overcharged and undercharged cells. Simulation and experimental results validate the superior efficiency of the bidirectional method, reducing balancing time and avoiding overvoltage issues during charging.