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Conference Paper
Development of Matching Layer for Ultrasonic Wireless Power Transmitter
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- Authors
- Gunn Hwang, WooSub Youm, Sung Q Lee
- Issue Date
- 2015-08
- Citation
- International Congress and Exposition on Noise Control Engineering (Inter-Noise) 2015, pp.1-11
- Language
- English
- Type
- Conference Paper
- Abstract
- The wireless power transfer technologies such as magnetic resonance and induction coupling have limited application areas because of its short transfer distance compared to device size and magnetic intensity limitation for the safety of body exposure. As an alternative, ultrasonic wireless power transfer technology has been proposed. The ultrasonic wireless power transfer system is composed of transmitter which converts electrical energy to ultrasonic energy and receiver which converts the ultrasonic energy to the electrical energy again. This paper is focused on the development of the matching layer of ultrasonic transmitter for energy conversion efficiency. The matching layer of the transmitter in water is calculated based on the acoustic impedance theory, designed through numerical analysis, and tested to get the optimal matching layer of the ultrasonic transmitter with the 1-3 composite piezoelectric ceramic structure of 30 mm diameter, 3 mm thickness. The tested 1-3 composite piezoelectric ceramics are PZT and PMN-PT. The polyoxymethylene (POM), also known as acetal and polyacetal, is chosen as a material of the matching layer. The maximum energy conversion efficiencies of the optimal matching layer of the transmitter are 76.1 % at 0.9 mm length of matching layer for PZT and 81.9 % at 1.3 mm length of matching layer for PMN-PT experimentally.
- KSP Keywords
- 1-3 Composite, Acoustic impedance, Application areas, Ceramic structure, Conversion efficiency(C.E.), Device size, Electrical energy, Energy conversion efficiency, Induction Coupling, Magnetic Intensity, Magnetic resonance(MR)