High Frequency AC Power Distribution Network for Electric Vehicle Auxiliary Electrical System

The existing high-frequency alternating current (HFAC) network for electric vehicle (EV) application has a significant limitation that the long AC transmission line leads to large distribution and conductor loss, voltage drop, and cable attenuation at a high frequency (HF) operation. In view of this issue, an optimized HFAC power network with DC transmission line for EV auxiliary electrical system is proposed. Due to the length-decreased HF transmission line, the HFAC bus operation frequency can be increased to a higher level to lower the system size. Then, an HF current-fed (CF) push-pull inverter with fourth-order CLCL resonant tank is proposed and investigated for the presented HFAC system. A pure sinusoidal voltage can be achieved through the high-order filter, and constant bus voltage and soft-switching of the switches are also obtained irrespective of the load variation. Finally, a GaN-based inverter prototype was built, and the experimental results are presented to verify the proposed solution