Wireless energy transmission through a thin metal wall by shear wave using two piezoelectric transducers

We propose a system to wirelessly convey electric energy through a thin metal wall. Two piezoelectric transducers are used to realize energy transformation between electric and mechanical, and a rechargeable battery is employed to store the transmitted energy, both are integrated as a system through a modulating circuit. A synchronized switch harvesting on inductor (SSHI) in parallel with the transducer system is introduced to artificially extend the closed interval of the modulating circuit. The process of transmitting-energy is computed and the performance of the transducers is optimized in detail for a prescribed external electric source. The obtained results are useful in the understanding and design of wireless energy-supply systems.