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In this letter, we present a simple method to extend the feasible rated charging zone of 4-coil coupled wireless charging system (WCS) by optimizing the compensate-capacitors of the coils. With the proposed optimizing method, the tolerant lateral misalignment of our WCS prototype has been extended to 44.3% of the coil size, achieving a 38.3% relative improvement. Electrical Engineering, he had been involved in research on battery management systems, vehicle control and wireless charging systems for electric vehicles. His currently research work is mainly concerned with the development of high power wireless charging system for commercial Electric Vehicles.

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In this study, a new method to estimate the load and mutual inductance for a wireless charging system (WCS) is presented. Instead of simultaneously using the root mean square and phase angles of related voltages and currents, accurate estimations can be obtained through the phase differences in the primary side. Firstly, the WCS model with dual-side inductorcapacitor-capacitor compensation networks is established, and the reflected impedance is analysed based on the phase differences in the primary side. Then, the estimation calculation of load and mutual inductance is derived according to the reflected impedance. Meanwhile, the output voltage estimation in the primary side is realised based on the estimated values of the load and mutual inductance. Finally, experiments are conducted to verify the effectiveness of the proposed method in the 3.3 kW electric vehicle wireless charging experiment platform. Experimental results show that the estimation errors of the load and mutual inductance are <5 and 3.5%, respectively, and the system output voltage can be effectively estimated based on their estimated results.

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