This paper presents a three-phase three-level fastbattery charger for electric vehicles (EVs) based in acurrent-source converter (CSC). Compared with the traditionalvoltage-source converters used for fast battery chargers, the CSCcan be seen as a natural buck-type converter, i.e., the outputvoltage can assume a wide range of values, which varies betweenzero and the maximum instantaneous value of the power gridphase-to-phase voltage. Moreover, using the CSC it is notnecessary to use a dc-dc back-end converter in the battery side,and it is also possible to control the grid current in order toobtain a sinusoidal waveform, and in phase with the power gridvoltage (unitary power factor). Along the paper is described indetail the proposed CSC for EVs fast battery charging systems:the circuit topology, the power control theory, the current controlstrategy and the grid synchronization algorithm. Severalsimulation results of the EV fast battery charger operating with amaximum power of 50 kW are presented.
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