Three Mode Three-Port Isolated DC/DC Converter With Dual Fast Charging Port

A three-mode three-port isolated DC/DC converter instigates the fast charging of electric vehicles (EVs). This topology will offer both simultaneous and independent operation and the automatic switching of the input supply from the DC link. In simultaneous operation, the converter will ensure the fast charging of two EVs through the two output ports. And in an independent process, the converter will charge only one EV since the other output port is not connected to the load (EV battery). Here the automatic switching is served by two DC relays. The two fast-charging port consists of series resonant converters (SRCs) in the three-port topology. With this three-port structure, the number of active switches (MOSFET) are reduced, which results in lower volume and system cost. Here a simple control method using phase shift and frequency modulations was developed to control the output power of the fast charging ports. A 8kW converter is designed with minimum guidelines to perform the dual fast charging operation at rated conditions.