Double Closed Loop Controller with Current Sharing of Interleaved DC/DC Converter for Dynamic Wireless Power Transfer System

Dynamic wireless power transfer (DWPT) of electric vehicles (EVs) is considered as an economic and effective solution on traffic electrification. However, the coupling coefficient between the transmitting and receiving coils changes dynamically with the movement of EV, resulting in a sharp drop in energy transfer power and efficiency. In this case, the double closed loop controller with current sharing of interleaved DC/DC converter is proposed to against coupling coefficient variation. And two layers double D coil structure is presented to make the distribution of magnetic density and temperature more uniform. Moreover, Simulation studies are carried out in PLECS to verify the proposed strategy in DWPT system. Results show that the proposed algorithm can not only significantly improve the energy transfer power and efficiency, but also ensure the current sharing of interleaved DC/DC converter, so as to enhance the robustness and stability of DWPT system.