A non-isolated high-power-density bidirectional dc/dc converter named multiphase interleaved with a coupled inductor is described. The proposed converter allows low current and voltage ripple, lower power losses, reduction on power component stress and magnetic volume. Moreover, the coupled inductor is applied to achieve current sharing between each leg in a simple manner, which is helpful to simplify the structure and meaningfully improve performance. Auxiliary clamp circuits are not required and can operate over a wide voltage and power range, achieve a better dynamic response and low ripple while maintaining high efficiency. This paper illustrated the steadystate operating principle under the inductor current continuous, discontinuous conduction modes and their boundary conditions in detail, the voltage and current stress of the power devices are shown, parameter design guideline, mathematical derivations and a comparison between the proposed converter and previous dc/dc converters were conducted. Finally, a 4.5 kW proof-ofconcept laboratory prototype has been designed, developed, and tested to demonstrate the performance of the proposed converter for wide load variation. The measured efficiency for the rated load was over 98 % for maximum input voltage.

This paper proposes a novel multi phase interleaved bi-directional dc/dc power converter to interface two dc sources of different voltage levels which applied for energy storage systems in high power level. The converter is proposed to reduce the input and output ripples, as well as, the size of passive components once the voltage and current ripple in the filters are four times higher than the switching frequency. A coupled inductor is employed to equal current splitting between the switch branch of the converter and obtain higher power density, and to reduce conduction loss, applying a multi phase interleaving technique. The operation and theoretical analysis of the converter are presented with different modes of power transfer. Furthermore, the key operational principle and simulation results are presented showing the converter operation in both directions of the power flow.