Abstract
Dynamic wireless charging technology can supply power for electric vehicle (EV) while it is in-motion. However, the system output stability is heavily influenced by the mutual inductance variation of the magnetic coupler, which is a major drawback of the EV dynamic wireless power transfer (EV-DWPT). This paper focuses on the primary coil design and its activating method. First, the LCC compensation network was adopted in both primary side and pick-up side of the system to achieve the constant primary current characteristic. Subsequently, a double-coil excitation method with the crossed-DD coil structure was proposed, which specifically concentrates on the feature of the dynamic mutual inductance. Simulation studies were carried out to prove the effectiveness of the proposed system. An EV-DWPT system prototype was performed to further verify the theoretical and simulation results.
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