A High Efficiency High Density Converter for Fast Charger Applications with Three Phase CLLC Topology

In recent years, due to the advantage of environmental-friendly, the new energy vehicles, especially the electric vehicles (EVs) have gained much attention in the transportation sector. With the continuous power improvement of charging piles, the EVs connected to the piles gradually performed as energy storage devices from the perspective of the power system. Consequently, not only the demand for high-performance charging technology of EVs is continuously growing, the bi-directional charging capabilities are also required. In this paper, aiming to the future power module in fast charging and discharging station, a solution with three-phase CLLC converter is provided, and the resonant parameters of CLLC converter are designed in detail. Moreover, a calculation method with the correction factor is given to increase the accuracy of synchronous rectification. Finally, the correctness of the analysis is verified by simulation.