Three-Port Isolated Hybrid Converter for Power Supply Systems in EV

A novel Three-Port Isolated Hybrid Converter (3-PIHC) applicable for power supply systems in EV applications were discussed in this paper. The proposed 3-PIHC topology employs a multilevel half bridge in the primary side of the converter which in turn reduces voltage stress across the primary side switches to half of the supply voltage. The power transfer between any ports in the proposed 3-PIHC is possible by selecting appropriate phase shift angles. The main challenge in this converter topology is that supply voltage variations results in increased RMS value of current stress across the semiconductor switches and the transformer windings, while employing conventional phase shift modulation. To enhance the performance of the proposed converter a new modulation technique has been applied and the power flow equations were derived. The performance of a 1.5kW, 3-PIHC converter was evaluated and presented.