Design and modelling of impedance matching network for Class E ZVS inverter acoustic power transmitter

• Main Author: Husin, Siti Huzaimah
• Format: Thesis
• Language: English; English
• Published: 2024
• Online Access: http://eprints.utem.edu.my/id/eprint/28561/; https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=124374

Acoustic Power Transfer (APT) is known as one of the techniques used in wireless power transmission technology. APT uses sound waves or vibration as a tool to transmit power. APT can be applicable in air, metal, and water mediums and also pass through living tissue in the human body. APT systems consist of a transmitter, propagation medium, and receiver, allowing for efficient and non-contact energy transfer, even under challenging environments, especially where the electromagnetic (EMT) is not permissible. Even though APT has received considerable attention from researchers in recent years, however, APT is still experiencing the low performance efficiency. Most findings concluded that the efficiency of APT systems relies on the ultrasonic air transducer excitation circuit and power amplification circuit. Hence, the major objective of this thesis is to design a Class E ZVS inverter for driving an APT transmitter circuit useful for exciting ultrasonic transducer properly. However, the nature of Class E ZVS inverter is inherently unstable to parameter variations, which can lead to instability and a decrease in efficiency. The design starts with a Class E ZVS inverter for 47 Ω purely resistive component, which is the optimum load operation, Rs to produce 2.0 W output power. The experimental results show that the design capable to produce 85.42% of DC-to-AC power conversion efficiency. Then, the design of an APT transmitter unit that incorporated a π1a impedance matching circuit is proposed to aim for less sensitive network to load variation. The experimental results show that the design achieved an input power of 2.05 W and the output power of 1.74 W and produced 85.07% of DC-to-AC power conversion efficiency. The analysis regarding Zero Voltage Switching (ZVS) waveform, input power,