Abstract
A bidirectional energy transfer method is proposed and investigated for wireless excitation of piezoelectric devices. In the proposed bidirectional system, two receiving coils are deployed on both sides of a transmitting coil so as to capture the generated magnetic fields based on magnetic resonance coupling. The piezoelectric devices connected across each receiving coils get energized wirelessly because of the mechanism of electromagnetic resonance as well as piezoelectric resonance. It is found that the power across driven piezoelectric devices arrive at maximum for operating resonant frequency. The optimum power received by piezoelectric devices wirelessly through the bidirectional energy transfer system is significantly higher than that of the single-sided receiver system. By implementing the proposed bidirectional energy transfer method, two piezoelectric devices can be energized simultaneously instead of a single piezoelectric device through the usual single-side receiver system without affecting the maximum power transfer efficiency. Copyright © 2015 John Wiley & Sons, Ltd.
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