Abstract
In a magnetically coupled resonant (MCR) wireless power transfer (WPT) system, adding repeating coils is an effective way to lengthen transmission distance and improve the transferred power in a wide range. This paper investigated a 3-coil MCR WPT system. Based on fundamental harmonic analysis on the equivalent circuit model, the relationship between the transmission characteristics and the spatial misalignments of coils were derived in detail. To improve the robustness of the output power to the spatial scales, one can adjust the position of the repeating coil to ensure the mutual inductances between sending and repeating coils, receiving and repeating coils be proportional when the spatial scales of load coil varies. To verify the theoretical analysis, a prototype of the 3-coil MCR WPT system was built and the experimental validation were carried out.
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