Module size investigation on a 150 kW charger for electric vehicles

Paper in proceeding, 2019

Fast chargers as defined by CharIN are DC-chargers up to a power level of 50 kW and are usually built to charge one vehicle. New High Speed Chargers can have a power up to 150 kW and Ultra High Speed Chargers up to 350 kW, which could be made out of several modules that can be combined and charge several vehicles. In this article it is investigated how the number of modules influences the charge process. When charging two cars that arrives at the same time, two 75 kW-modules are more favorable than just one 150 kW-module and with two modules the total charging time is almost the same as with five 30 kW-modules. An example case, where the total power is the same, shows that with different sized cars the charging is approximately 39% faster with two modules and 42-44% faster with five modules compared to a case with only one charging outlet and one big module. A power level of 17-20 kW or 30-40 kW could be suitable, one or two parallel SiC power electronic devices with the TO247 package in each position is enough to handle that power level. Standard ferrite components can be used and at this power level the cost of control circuits are quite small compared to the power electronic parts.