Research on Constant Voltage Output Optimization Method for EV Dynamic Wireless Charging System

In the dynamic wireless charging system for EVs, the cascaded multi-stage transmitting rail is widely used due to its unique advantages. Combined with the LCC-S constant voltage output compensation topology, the system control method is also simplified. However, the primary side structure of this method is pretty complicated and the number of components is large. The cost is very expensive in long-distance applications. In response to this problem, this paper proposes a method of adding a relay coil to the secondary coil. By setting the transmitting, relay and receiving coils as series compensation, the primary side structure is simplified while maintaining the dynamic constant voltage output of the system and saving the cost of components. Theoretical analysis and simulation results verify the feasibility and superiority of this method.