New attachment method to increase the performance of ultrasonic wireless power transfer system

Rezaie, Hoda; Hu, Aiguo Patrick; Leung, Ho Fai; Cordell, Richard

doi:10.1109/wow.2017.7959359

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…In APT literature, it is often claimed that the transmitted power is maximized when the characteristic acoustic impedance of the wall Z wall a equals the characteristic acoustic impedance of piezoelectric discs Z piezo a [5,40,[43][44][45]. This rule is justified by the fact that mechanical impedance mismatches lead to large reflections.…”

Section: Mechanical Impedance Issuesmentioning

confidence: 99%

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Analytical optimization of piezoelectric acoustic power transfer systems

et al. 2020

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Acoustic power transfer and communication through metal layers is of great interest in many applications where the integrity of metal boxes, tanks, pipes or walls must be preserved by avoiding through-hole electrical connections. While acoustic power transfer has been widely studied last decades, the optimization of such systems has not been assessed comprehensively regarding the choice of transducers’ dimensions and materials and the impact of the wall characteristic acoustic impedance. This paper stands at answering these optimization issues, using a new implementation of an analytical model and two figures of merit to evaluate performances: the power transfer efficiency and a new figure of merit, the normalized transmitted power, a crucial characteristic for electronics implementation. Among other results, we disprove the commonly used design rule stating that equalizing the characteristic acoustic impedance of wall and transducers is the best option. We propose a method to quantify the impact of acoustic impedance mismatches on performances and show that intermediary layers sized with our optimization process can solve these acoustic impedance issues, resulting in an important gain in the transmitted power (multiplied by 40 in our example) and opening up great opportunities for the acoustic power transfer technology.

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Section: Mechanical Impedance Issuesmentioning

confidence: 99%

“…When an APT system using piezoelectric discs is built, transducers are generally connected to the wall using glue or acoustic couplant [20,36,40]. These additional layers affect the system's behavior and its efficiency.…”

Section: Impact Of Glue or Acoustic Couplant On Apt Performancesmentioning

confidence: 99%

Analytical optimization of piezoelectric acoustic power transfer systems

et al. 2020

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“…As mentioned in Section 1, Bao et al, did not apply any AC-DC conversion circuit in their UTMWPT systems [15,16]. 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].…”

Section: Measurementsmentioning

confidence: 99%

“…The simulation results showed a good consistency in trend with the experimental measurements. They also presented a spider clamp attachment method to bond the piezoelectric transducers to the metal wall in a UTMWPT system [21]. A prototype system built with this new attachment method was shown, which could, at best, transmit 1.0 W of power through a 1-mm-thick steel plate with an efficiency of 38%.…”

Section: Introductionmentioning

confidence: 99%

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

Yang

2018

Applied Sciences

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Featured Application: Wirelessly powering sensors and circuits enclosed in hermetic metal containers.Abstract: This paper presents a novel and efficient system capable of transmitting medium-power electric energy through a solid metal wall and generating a regulated direct current (DC) output. The electric power is transmitted using radio frequency (RF) ultrasound without physical penetration. An RF alternating current to direct current converter with input impedance matching is used to convert the transmitted RF signal to a DC output, which is directly suitable as a power supply for electronic devices. The system is constructed from commercial off-the-shelf components, and a computer-controlled measurement method is designed to test the effectiveness of the full system. The measurement results show that the system is able to transfer power through a 40-mm-thick stainless steel plate and generate 5-V, 15.7-W regulated DC output power with an overall power transfer efficiency of 27.7%. In addition, the effectiveness of the system is successfully demonstrated by powering ARM ® evaluation boards with liquid-crystal display panels. A discussion of potential enhancements that could be made to improve the transfer capability and efficiency of the system is also presented. This system could be applied to improve safety and preserve structural integrity in many industrial and military applications, such as submarines, space crafts, planes, nuclear storage facilities, etc.

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