The Novel Electric Vehicle High-Power On-Board Charger Topology with Modular Multilevel Converter

In this paper, an on-board charger with a maximum power of 23 kW is presented to charge lithium-ion battery, which is a transformerless two-stage on-board charger includes a power factor correction converter (PFC) and a DC-DC converter. In this research, in order to achieve high power in the DC-DC part, the idea of using a bidirectional Triangular Modular Multilevel dc-dc Converter (TMMC) with 20kHz switching frequency and for the power factor correction part, a boost Interleaved converter with 5kHz switching frequency is used because it has good performance for high powers. The maximum efficiency and maximum power factor of the proposed system are 96.3% and 99%, respectively.