Abstract:This paper studied the miniaturization design of an asymmetric three-coil magnetic resonant coupling wireless power transmission system for the special application of implantable medical devices, wireless sensors and portable electronic devices such as mobile phones. Based on the equivalent circuit model, the expression of the transmission efficiency of the three-coil system is deduced and the transmission characteristics of the three-coil system and the condition of the maximum efficiency transmission are analyzed. The outer diameter of the receiving coil is only 38.0 mm and the thickness is 0.6 mm. the measured transmission efficiency is 79.4% at 10mm distance, and the transmission efficiency is above 50% within 100mm distance. The effects of the axial misalignment and deflection angle on transmission efficiency are studied by simulation and experiment.
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