With the rapid development of electrical vehicles (EV) and the trends in transportation electrification, the demand for fast charging facilities for electric vehicles is rising.

In this thesis, a two-stage power electronics converter for DC fast battery charging application is designed and studied. A buck type 12-pulse converter with triangular current shaping method for harmonic reduction and power factor correction is chosen to be the front-end converter. Back-end converter is designed to be a full bridge converter with partial power processing technique.

This thesis innovatively proposed highly efficient ultra-fast charger charger using the multiple pulses rectifier with partial power processing DC-DC converter.

This EV fast charger meets the requirements of isolation, high efficiency, high output voltage and good power quality (low THD and unity power factor). This thesis describes in detail the analytical modeling of the studied circuit, including {the} loss modeling of the semiconductors and passive components and the design of three phase three winding transformer and phase shift full bridge transformer. Finally, the simulation results and experimental results of the proposed EV fast charging system are presented and analyzed.