This paper proposes a double-sided LCC compensation network and its tuning method for wireless power transfer (WPT). With the proposed topology and its tuning method, the resonant frequency is irrelevant with the coupling coefficient between the two coils and is also independent of the load condition, which means that the system can work at a constant switching frequency. Analysis in frequency domain is given to show the characteristics of the proposed method. We also propose a method to tune the network to realize zero voltage switching (ZVS) for the Primary-side switches. Simulation and experimental results verified analysis and validity of the proposed compensation network and the tuning method. A wireless charging system with output power of up to 7.7 kW for electric vehicles was built, and 96% efficiency from dc power source to battery load is achieved.

This paper compares the characteristics of the series-series (SS) and double-sided LCC compensation topologies for electric vehicle (EV) wireless chargers. Both the well-tuned and mistuned topologies for the two compensation methods are analyzed in detail. The mistuning considered here is mainly caused by the variations of the relative position between primary and secondary sides. The output power displacements (PD) caused by mistuning are compared for both compensation topologies, as well as the impacts of the load variations on the performances of the mistuned topologies. The voltage and current stresses on components are also studied. The comparative result shows that the double-sided LCC compensation topology is less sensitive to the mistuning. A double-sided LCC compensated EV wireless charger system with up to 7.7kW output power is built to verify the analysis results. A peak efficiency of 96% from DC power source to battery load is achieved.

This paper presents an integrated LCC compensation topology for EV/PHEV wireless chargers. The effect of the coupling between the additional coil and the main coil on the LCC compensation topology is studied. The proposed topology will reduce the size of the additional coil and make the system more compact with extremely high efficiency. The basic characteristics of the proposed topology are analyzed based on fundamental harmonic approximation (FHA). Furthermore, based on steady-state model, three categories of operation modes are presented and analyzed. In order to realize zero voltage switching (ZVS), the series capacitor C2 on the secondary side is tuned. Numerical method is used to analyze the impact of different values of ΔC2 on the turn-off current and the best value of C2 is chosen to build a prototype to verify the analysis.Index Terms-Current source, electric vehicle, operation modes, wireless power transfer, zero voltage switching (ZVS). , where he is involved in the modeling and design of wireless charger for EVs/PHEVs. His research interests include wireless power transfer, EV/PHEV system, renewable energy and power electronics. 0278-0046 (c)

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