Using Mixed Coupling Four-coil Structure to Improve Power Transfer Efficiency and Misalignment Tolerance for Wireless Power Transfer

Abstract

In this thesis a mixed coupling four-coil (MC4C) structure be proposed to improve the lateral and angular misalignment tolerance in this thesis for the applications of biomedical implants or consumer electronics The MC4C structure applies both the complementarity of magnetic coupling and electrical coupling and the high power transfer efficiency (PTE) of a four-coil structure Compared with the traditional magnetic-coupled four-coil structure under the existence of lateral and angular misalignment the MC4C structure can improve its power transfer efficiency In addition the circuit model of MC4C is verified by mathematical software and can describe the PTE and misalignment tolerance characteristics completely and accurately From experiment the proposed MC4C structure achieve a PTE of 46% and 32% at a transmission distance of 40 mm and 50 mm respectively The degradation rate of MC4C is 41% under laterally misalignment of DL = 50 mm which is less than that of the conventional four-coil configuration 58% implying a smaller performance degradation For angular misalignment the degradation rate of MC4C is merely 7% at an angular misaligned of 72 deg which is much smaller than that of the conventional four-coil configuration 32% Therefore it can verify that the proposed structure has a better misalignment tolerance

Date of Award	2019
Original language	English
Supervisor	Chin-Lung Yang (Supervisor)