A system of two piezoelectric transducers and a storage circuit for wireless energy transmission through a thin metal wall

Abstract

A system to wirelessly convey electric energy through a thin metal wall is proposed in the paper, where 2 piezoelectric transducers are used to realize energy transformation between electric and mechanical, and a rechargeable battery is employed to store the transmitted energy. To integrate them as a whole, an interface of a modulating circuit is applied between the transducer system and the storage battery. In addition, a synchronized switch harvesting on inductor 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 transducer system is optimized in detail for a prescribed external electric source. The results obtained are useful for understanding and designing wireless energy supply systems.

An Ultrasonic Through-Metal-Wall Power Transfer System with Regulated DC Output

“…Systems presented by Leung et al could at best output only about 1.0 W of AC power [21]. Hu et al greatly simplified the UTMWPT system model in simulation and did not present experimental results [14]. Only Lawry et al presented a medium-power DC output UTMWPT system, as well as experimental results [17,18].…”

“…In their later work [14], an alternating current to direct current (AC-DC) converter was employed at the receiving side of a UTMWPT system to convert the radio frequency (RF) alternating current (AC) output of the receiving transducer into a stable direct current (DC). The AC-DC converter was composed of a capacitor-filtered diode full-bridge rectifier (CF-DFBR) and a buck DC-DC converter.…”

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 ].…”

Wireless Power-Data Transmission for Industrial Internet of Things: Simulations and Experiments

“…At some point in time Spatial Equivalent Plane Acoustic Pressure (SEPAP) was proposed to address a number of shortcomings in the performance of existing systems [12]. Hu et al proposed the piezoelectric transceiver system for energy transmission through thin metal walls, with a power storage unit on the receiver end [14]. The power transmission capability remained around 6.35W atts, which is sufficient quantity of power to drive a network of low power sensors.…”