A High-Gain Reflex-Based Bidirectional DC Charger with Efficient Energy Recycling for Low-Voltage Battery Charging-Discharging Power Control

摘要: This study proposes a high-gain reflex-charging-based bidirectional DC charger (RC-BDC) to enhance the battery charging efficiency of light electric vehicles (LEV) in DC-microgrid. The proposed topology consists an unregulated level converter (ULC) and two-phase interleaved buck-boost charge-pump (IBCPC), which together provide low ripple high voltage conversion ratio. As RC-BDC charges, LEV’s with reflex currents, efficiency, prolonged life cycles are achieved. is possible due recovering negative pulse energy currents reduce charge dissipations within batteries. Derivations operating principles RC-BDC, analyses its topology, closed-loop control designs were presented. Simulations experiments implemented 48 V DC-bus 400 for 500 W prototype. results verify feasibility concept compared typical constant-current/constant-voltage (CC/CV) charger. comparison shows that gain improves speed reduces thermal deterioration effect by about 12.7% 25%, respectively.