This paper proposes a novel bidirectional DC-DC converter. It contains three sets of cascaded bidirectional boost converters at the low-voltage side (LVS), and its unique connection method divides the LVS current into three branches. One switched capacitor module is configured at the converter's high voltage side (HVS). This paper analyzes the working principle of the proposed converter in the steady state, and derives the corresponding voltage-current relationship. Finally, by verification in a simulation model, the correctness of the theoretical analysis is demonstrated.