A Strongly Coupled Vehicle-to-Vehicle Wireless Charging System for Emergency Charging Purposes With Constant-Current and Constant-Voltage Charging Capabilities

One current issue concerning rapidly developing electric vehicles (EVs) is range anxiety, especially when no charging station is around. A simple and expandable vehicle-to-vehicle (V2V) wireless charging scheme has been proposed to satisfy urgent charging needs. In the proposed V2V system, one EV serves as a mobile charger for the other. Two power relay coils without compensating capacitors are adopted, forming a strong coupling with the coils in the EV. Thus, power can be transferred from one EV to the other via the ac magnetic relay. The mathematical models of the existing loosely coupled V2V system and the proposed strongly coupled V2V system are established. The constant-voltage and constant-current operations for the proposed V2V system are explored. The experimental results reveal that, compared with the existing loosely coupled V2V system, employing the proposed strongly coupled V2V system can improve efficiency and reduce weight, volume, and cost.