Experimental validation of 20 kW EV charger module based on Vienna rectifier and series-resonant dual active bridges

Abstract

This paper shows a series of experiments on the 20 kW SiC-based electric vehicle (EV) charger module. From the grid side, the system is connected through Vienna rectifier which produces bipolar ±400 V DC voltage. The isolation is provided by two 10 kW series-resonant dual-active-bridges (SRDAB) which are connected in series at the input and parallel at the output. The grid rectifier is operating at 66 kHz and DC/DC converters operate at 100 kHz switching frequencies. A detailed description of each – AC/DC and DC/DC – stage is provided. The experimental validation of the whole charger at the nominal power includes exemplary waveforms from the oscilloscope – start-up process and steady-state operation, and power meter – efficiency and power quality parameters measurements.