High efficiency bidirectional DC-DC converter with wide input and output voltage ranges for battery systems

This paper presents a high efficiency bidirectional DC-DC converter for the integration of battery systems to DC-link. The proposed converter adopts the non-inverting buck-boost topology that enables wide-range voltage conversion. Furthermore, a new hybrid control scheme for achieving highly efficient power conversion is introduced. A 2.5 kW hardware prototype based on SiC-MOSFETs is fabricated and tested for performance verification. Experimental results show that the prototype achieves an efficiency of more than 97% at 4% load and an efficiency of more than 99% around the rated operating point.