PROJECT TITLE :

Wireless Power Transmission Based on Sandwiched Composite Piezoelectric Transducers in Length Extensional Vibration

ABSTRACT:

A new type of wireless power transmission system is proposed. It's composed of 2 sandwiched composite piezoelectric transducers in length extensional vibration, which are connected along by an intermediate metal transmission cylinder. When the dielectric and mechanical losses are considered, the resonance/antiresonance frequency equations are obtained. The impact of the mechanical and therefore the dielectric loss, the geometrical dimension and the load electrical impedance on the effective electromechanical coupling coefficient, the voltage gain, and the ability ratio is analyzed. It is shown that the mechanical and the dielectric losses virtually don't have any impact on the resonance/antiresonance frequency. The geometrical dimension has obvious impact on the resonance/antiresonance frequency, the voltage gain, the effective electromechanical coupling coefficient and the facility ratio. Comparable to definite geometrical dimensions, the effective electromechanical coupling coefficient and the voltage gain have most values. There's optimum load electric impedance at that the power ratio reaches the maximum value. Two wireless power transmission systems are designed and manufactured; the resonance/antiresonance frequencies, the voltage gain, and the ability ratio are measured. It is shown the measured frequencies are in smart agreement with the theoretical results.