A wireless power transfer system via magnetic resonance
using a transmission coil array was proposed. The effect of the
proposed system was confirmed by the measurement and the
simulation. The proposed system has two modes for phase
excitation alternation. The decline of the transfer efficiency
was improved by using the suitable modes. One of the reasons
for the difference between the measurement results and the
simulation results was suggested to be the mutual coupling
between the transmission coils.
In this paper, the first mode (in-phase excitation) and the
second mode (out-of-phase excitation) were realized by the
orientation of the loop for Transmission Coil 2. Also, good
impedance matching was obtained by adjusting the gaps
between each coil and the loop. Development of the other and
practical means for the excitation mode control as well as
impedance matching besides the gap adjustment in this study is
subject to the future work.