DESIGN CONSIDERATIONS AND TOPOLOGY SELECTION FOR A 120-KW IGBT CONVERTER FOR EV FAST CHARGING

Fast charging of electric vehicles (EV's) is a very desirable feature, especially for long-distance travel, For an EV with a battery capacit y of 30 kWh, a 15-min charge requires 120-kW charging power, Inductive charging offers a safe and convenient means to accomplish this task, This paper investigates the design criteria of the high-power converte r for a 120-kW inductive battery charger, Since insulated gate bipolar transistors (IGBT's) are the devices of choice at this power level, t he impact of IGBT tosses on the converter design and topology selectio n is investigated, A comparison between a zero-voltage-switching (ZVS) and zero-current-switching (ZCS) series-resonant converter (SRC) is p resented, Based on the comparison results, a ZCS SRC topology is selec ted for this application, and an experimental 120-kW/75-kHz unit was b uilt and tested in the laboratory to verify the results.