Wireless energy transmission through a sealed wall using the acoustic-electric interaction of piezoelectric ceramics

Abstract

We propose a system to transmit and store electric energy by using transmitting element, a chargeable battery, and a rectifier together with a dc-dc converter to connect the two components as an integrated system. The transmitting element is modeled by two piezoelectric transducers. One is as the driving transducer for generating acoustic wave; the other is as the receiving transducer for converting the acoustic energy into electric energy. A dc-dc converter employed in the storage circuit is to match the optimal output voltage of the receiving transducer with the battery voltage for efficient charging. A synchronized switch harvesting on inductor (SSHI) in parallel with the receiving transducer is introduced to artificially extend the closed circuit interval of the rectifier. This analysis extends a previous one by considering that influence of wall thickness which always exists in the application. The characteristics of the energy-transmitting element are studied. Performance of the energy-transmitting element is optimized by synthetic adjusting parameters of the element, and carefully choosing input frequency of electric source.

Through-Metal-Wall Power Delivery and Data Transmission for Enclosed Sensors: A Review

“…These transducers are acoustically coupled to the elastic layer’s inner and outer surfaces operation in the thickness-twist mode of vibrations [ 36 ], thickness-shear mode of vibrations [ 37 ], and thickness-stretch mode of vibrations [ 38 ], respectively. Efficient power harvesting methods and circuits are also considered [ 39 , 40 , 41 ] when modeling the power transfer capabilities of some of these channels.…”

“…The acoustic-electric channel formed by a pair of piezoelectric transducers coaxially aligned opposite of the metal wall is the most common through-metal-wall power delivery and data transmission configuration as shown in Figure 5 . There have been several different methods for modeling this channel and analyzing the voltage transfer ratio and power delivery efficiency, including analytical methods based on wave propagation equation and piezoelectric theory [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ], finite element modeling [ 43 , 44 , 46 , 68 , 69 ], equivalent circuit method [ 2 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 83 ], S-parameters and ABCD parameters description of a linear two-port network model [ 70 , 71 , 75 ].…”

Electrical optimization of power delivery through thick steel barriers using piezoelectric transducers

“…Alternatively, many approaches have been presented that utilize piezoelectric transducers to transmit power and/or data through metallic barriers using ultrasound. [2][3][4][5][6][7][8][9][10][11] This work presents a practical methodology for electrically characterizing and optimizing the power transfer efficiency through an acoustic-electric channel. The channel is formed by coaxially aligning and acoustically coupling a pair of piezoelectric disk transducers to opposite sides of a thick metallic barrier.…”