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

1,2, 1,2, 1 and 1,2,*
Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, No. 21 North 4th Ring Road, Haidian District, Beijing 100190, China
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, China
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(5), 692;
Received: 13 February 2018 / Revised: 22 April 2018 / Accepted: 26 April 2018 / Published: 29 April 2018
PDF [19746 KB, uploaded 29 April 2018]


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. View Full-Text
Keywords: ultrasound; through metal wall; power transfer; piezoelectric transducer; AC-DC converter ultrasound; through metal wall; power transfer; piezoelectric transducer; AC-DC converter

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Yang, H.; Wu, M.; Yu, Z.; Yang, J. An Ultrasonic Through-Metal-Wall Power Transfer System with Regulated DC Output. Appl. Sci. 2018, 8, 692.

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