Design considerations and topology selection for a 120-kW IGBTconverter for EV fast charging

摘要

Fast charging of electric vehicles (EVs) is a very desirablenfeature, especially for long-distance travel. For an EV with a batteryncapacity of 30 kWh, a 15-min charge requires 120-kW charging power.nInductive charging offers a safe and convenient means to accomplish thisntask. This paper investigates the design criteria of the high-powernconverter for a 120-kW inductive battery charger. Since insulated gatenbipolar transistors (IGBTs) are the devices of choice at this powernlevel, the impact of IGBT losses on the converter design and topologynselection is investigated. A comparison between a zero-voltage-switchingn(ZVS) and zero-current-switching (ZCS) series-resonant converter (SRC)nis presented. Based on the comparison results, a ZCS SRC topology isnselected for this application, and an experimental 120-kW/75-kHz unitnwas built and tested in the laboratory to verify the results