Analysis and Design of two-stage on-board charge for all GaN devices

An ac/dc and dc/dc circuit are presented as one solution for the high-efficiency and high-power-density electric vehicle charge. The presented two-stage is able to perform high input power quality over a wide output voltage conversion range. Both conversion stages employ GaN FET devices for their low conduction loss and high switching frequency. For the dc-dc conversion, phase shift and variable frequency strategy is used for increasing the soft-switch area, reducing the reactive power. Comprehensive experimental results are presented throughout this paper to support the theoretical analysis.