Charge-Equalization Circuit for Series-Connected Batteries with Quasi-Resonant Flyback Converters

Abstract A charge equalization circuit for balance discharging in a series-connected battery bank is proposed in this paper. The circuit comprises several parallel-connected flyback converters which connect each unit battery in the bank to supply the electric load. The transformer leakage inductance and capacitances of MOSFETs are applied to fulfill the quasi-resonant zero voltage switching (ZVS), which consequently eliminates the voltage spikes and enhance the conversion efficiency. Design equations are derived and numerical analysis results are applied to evaluate the required values of the inductance and capacitance to realize ZVS performance. A battery bank with four series-connected lead-acid batteries is used to verify the proposed charge equalization circuit. The experimental results advocate the applicability of the proposal.

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