Resonant Inductive Wireless Power Transfer for Stationary Electric Vehicle Charging: Design, Hardware Implementation, and Experimental Performance Evaluation

In this paper, the design, realization through hardware, and experimental investigation of a resonant Inductive Wireless Power Transfer (IWPT) scheme for electric vehicle battery charging was investigated. From experiments, it was demonstrated that the realized circuit is capable of performing wireless energy transfer at frequencies of around 60 kHz and 92 kHz, while operating in the resonant mode. With an air gap of 1.5 cm in the coaxial alignment, an output power of 20.64 W, and an efficiency of about 55.1% at 12 V, 1.72 A was obtained. From the experimental results, it can be observed that the transferred power is greatly dependent on the TX-RX coil separation, and it becomes much lower as the air gap between the two coils is increased. Even though the design is capable of proving the working principle of resonant IWPT for low power charging, it suffers from the drawback of having short-range operation, sensitivity to coil positioning, and low efficiency. In future, efforts will be made to enhance the performance of the system in terms of increased range of operation, tolerance to coil misalignment, efficiency, and operation at high power levels.

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