Wireless Drive of Piezoelectric Components

Abstract

In this work, electromagnetic wave is used to drive piezoelectric components.We proposed and investigated three new techniques of transmitting electricenergy wirelessly to piezoelectric components which include wireless drive ofpiezoelectric components by parallel plate capacitor structure, by focused electricfield structure and by dipole antenna-like structure. The output power of the piezoelectriccomponent wirelessly driven by focused electric field structure is significantly higher than that wirelessly driven by the other two structures. In the focusedelectric field structure, when the operating frequency is close to mechanicalresonance frequency of the piezoelectric component operating in the thickness mode, a maximum real output power of 0.26 W and energy conversion efficiencyof 1.02% have been achieved with an input power of 26 W and 1 cm electrodeseparation. Experimentally it has been found that the real output power achieved by the piezoelectric component depends on the frequency, vibration mode, andelectrical load of the piezoelectric component, and electric field. We studied theelectric field pattern by finite element method to assess the electric field on the surface of the piezoelectric plate. It is seen that the electric field on the surface ofthe wirelessly driven piezoelectric plate is non-uniform. We also derived and thenproposed an equivalent circuit for the wirelessly driven piezoelectric componentoperating in the thickness mode, which can be used to analyze the vibration characteristics of the wirelessly driven piezoelectric plate.