Self-balanced Two-output Battery Charger
- Resource Type
- Conference
- Authors
- Branas, Christian; Azcondo, Francisco J.; Pigazo, Alberto; Casanueva, Rosario; Diaz, Francisco J.; Lamo, Paula
- Source
- 2023 IEEE Applied Power Electronics Conference and Exposition (APEC) Applied Power Electronics Conference and Exposition (APEC), 2023 IEEE. :1902-1907 Mar, 2023
- Subject
- Power, Energy and Industry Applications
Battery chargers
Switching frequency
Windings
Rectifiers
Voltage
Resonant converters
Transformers
Power electronics
battery chargers
resonant power conversion
batteries
HF transformers
- Language
- ISSN
- 2470-6647
The design and modeling of a self-balanced two-output battery charger capable to charge two high-power LiFePO4 battery packs is presented. The proposal is based on a four-phase resonant converter, which is designed as a voltage-controlled current-source, working at constant switching frequency. The output stage consists of a transformer with a single primary and two secondaries implementing two current-doubler rectifiers. The structure of the output stage naturally imposes the self-balance-of-charge of both battery packs provided that the coupling between the primary and each of the secondaries has a negligible mismatch. The electrical model of the battery is used to study the batteries charge equalization during the charging process considering the non-idealities of the output transformer. The theoretical analysis and design procedure of the proposed battery charger is fully explained. The output current capability and efficiency are validated experimentally considering a 50 Ah 48 V commercial battery pack.