Abstract:As more electric vehicles (EV) companies jump on the bandwagon of wireless power transmission, interoperability issues are becoming increasingly apparent. In addition to the common problems of coupling structure, compensation network and communication protocol interoperability, battery voltage (BV) interoperability issues are also gradually emerging, that is, different battery voltage levels of various models. For the BV level of the existing EV power battery, the rated voltage can be mainly divided into 400 and 800 V. Considering the interoperability of public radio energy transmission facilities, EV radio energy transmission systems must be effectively compatible with 400 and 800 V BV levels at the same power level. A reconfigurable topology with the BV interoperability is proposed. The device uses two completely stacked unipolar coils as magnetic coupling structures, enabling two different output voltages under the same power level by switching. The proposed system is analyzed and modeled by establishing a mathematical model, followed by the development of a 1.3 kW downscaled experimental prototype to verify the function of the proposed reconfigurable topology. The results show that the system can switch between 200 and 400 V output voltages while maintaining an output power of 1.3 kW. The maximum system direct current-direct current (DC-DC) efficiency is 90.97% and 95.51%, respectively. Finally, to assess the migration performance of the proposed structure, additional testing was conducted using the experimental prototype. The results show that the DC-DC efficiency of the proposed system is higher than 90% in the migration range of ±100 mm.