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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.
Highlights
Wireless power transfer (WPT) systems allow elimination of cables, plugs and sockets, resulting in extended maintenance-free operation and increased reliability and safety [1]
A synchronized switch harvesting on inductor (SSHI) in parallel with the receiving transducer was introduced to extend the closed interval of the alternating current (AC)-direct current (DC) converter
Based on the achievements of Lawry et al we for the first time adopted an radio frequency (RF) alternating current to direct current (AC-DC) converter with input impedance matching in a ultrasonic through-metal-wall power transfer (UTMWPT) system
Summary
Wireless power transfer (WPT) systems allow elimination of cables, plugs and sockets, resulting in extended maintenance-free operation and increased reliability and safety [1]. A synchronized switch harvesting on inductor (SSHI) in parallel with the receiving transducer was introduced to extend the closed interval of the AC-DC converter Both analytical and numerical results of the system were presented. The simulation results showed a good consistency in trend with the experimental measurements They presented a spider clamp attachment method to bond the piezoelectric transducers to the metal wall in a UTMWPT system [21]. Based on the achievements of Lawry et al we for the first time adopted an RF AC-DC converter with input impedance matching in a UTMWPT system This RF AC-DC converter made our UTMWPT system the first one capable of efficiently converting the transmitted RF signal to a regulated DC voltage.
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