Abstract
Traditional bidirectional DC-DC converters have many problems, such as high return power, limited soft-switching range and switching off at peak current. LC series resonant DC-DC converter with inductive-capacitive resonance network has become a research hotspot. In this paper, the equivalent circuit and mathematical model of LC series resonant DAB converter are established by fundamental wave analysis method. On the basis of explaining the working principle of phase-shifting control mode in detail, the working mode of LC series resonant DC-DC converter is analyzed, the switching-off conditions of the converter are deduced, and the power transmission characteristics and soft switching characteristics of the converter under different switching-off conditions are analyzed. The simulation model is built on the simulation platform. Finally, the hardware experiment platform of the converter is built based on the TMS320F28335 and three-component lithium-ion batteries. The simulation analysis and experimental results verify the correctness of the theoretical analysis in this paper.
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