A three phase bidirectional V2G interface converter based on SiC JFETs

This paper presents a 10kW three phase bidirectional on-board battery charger for use as a V2G interface in electric vehicles (EVs). The interface to the grid in the on-board charger is a three phase IGBT-based boost converter, being in charge of the power factor correction (PFC). The interface to the battery is an isolated dual active bridge (DAB) converter based on the silicon carbide (SiC) JFETs. 1200V rated SiC JFETs enable both the operation at high voltage values in the DC link (above 500V) and high switching frequencies in the range from 50 to 150 kHz. Both high converter efficiency and compact converter design can be achieved thanks to the application of these wide band gap components. The control algorithm where PFC stage can control the flow of reactive power and the DAB the flow of active power between traction battery and the grid is presented and analyzed.