Abstract
This paper proposes a novel battery management system (BMS) based on a three-level flying-capacitor three-port converter operated in discontinuous current mode (DCM). In BMS, the reduction of the inductor volume is required in a DC-DC converter. In particular, the proposed three-port converter contributes to the reduction of the inductor volume by sharing the inductor for the power conversion among solar cells, battery and DC-link. In addition, DCM is applied to further minimize the inductor volume. The validity of the proposed three-port converter and the inductor design for DCM operation is demonstrated with a 750-W prototype. In particular, it was mentioned that the prototype circuit achieves DCM in all operation modes. Furthermore, the inductor volume with DCM is reduced by 53 % compare to that with CCM.
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