Robustness study of resonant electromagnetic wireless power transfer

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Dr. Pávó József
Department of Broadband Infocommunications and Electromagnetic Theory

The aim of this present work is to give a quantitative set of results for the robustness of wireless power transfer system highly researched nowadays. These systems typically consists of two self-resonant coils.

Energy transfer occurs through the tails of the oscillating slowly evanescent near fields of the coils, i.e. the phenomenon is called inductive resonant coupling.

This method of energy transfer can be described in different ways. The most prevalent one is coupled mode theory. This was developed from perturbation theory and variational principles and is valid in the regime of weak coupling and in the vicinity of the resonance frequency.

A new approach is the full-wave modeling of the whole system. In this case the full set of Maxwell's equations are taken into consideration, so that the results obtained this way are appropriate in all cases.

Robustness study was carried out using MATLAB scripts and functions for specifying geometry, to perform parameter sweeps and also for post-processing data. The given field-computing software was also written in MATLAB.

Several parameter sweeps were executed primarily for investigating the effects of production and positioning inaccuracy on the efficiency of the power transfer.


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