Series-resonant battery charger with synchronous rectifiers for LiFePO4 battery pack

This paper presents a battery charger for LiFePO₄ battery pack based on a series-resonant topology. The synchronous rectification technique is incorporated into the proposed system to improve the charging performance. Moreover, the frequency domain analysis and the equivalent circuit of each operation mode are descried and conducted. The frequency characteristics of the proposed system are also detailed from the derived mathematical models. Besides, a simple charging strategy is adopted to verify the feasibility. All the experimental results agree with the theoretical predictions.