The characterization of class E Pi1B capacitive power transfer for biomedical implantable device application

• Main Author: Meor Shaari, Nurul Muslimah
• Format: Thesis
• Language: English; English
• Published: 2023
• Online Access: http://eprints.utem.edu.my/id/eprint/27148/1/The%20characterization%20of%20class%20E%20Pi1B%20capacitive%20power%20transfer%20for%20biomedical%20implantable%20device%20application.pdf; http://eprints.utem.edu.my/id/eprint/27148/2/The%20characterization%20of%20class%20E%20Pi1B%20capacitive%20power%20transfer%20for%20biomedical%20implantable%20device%20application.pdf; http://eprints.utem.edu.my/id/eprint/27148/; https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=118128

The use of Wireless Power Transfer (WPT) technology for recharging or providing a continuous supply of electricity to Biomedical Implantable Devices (BID) has become very useful recently. To date, Inductive Power Transfer (IPT) remains the most popular technique used to transmit power and data between the primary and secondary sides of the biomedical implanted system. However, designing a wireless transcutaneous system is complicated and the efficiency of existing system is still very low due to the variability of the environment and sensitivity to design parameter changes. Therefore, this research proposes the design of efficient WPT system based on capacitive approach for BID application. In this research, a Class E power amplifier with π impedance matching circuit is proposed to drive the Capacitive Power Transfer (CPT) system. An impedance matching is applied in order to optimize the system efficiency by making it less sensitive to the load variations. Two types of impedance matching, which are π1a and π1b matching resonant circuits are selected and compared in this research in order to understand the advantages and disadvantages of each in the framework of CPT system. MATLAB/Simulink software is used in this work to design and simulate the system. A 1W prototype operated at 6.78MHz frequency was constructed to verify the proposed circuit. The best experiment prototype of this work has demonstrated 89.4% efficiency with 0.636 cm x 0.636 cm area of capacitive coupling plates, which have a layer of meat in the range of 1mm to 10mm thickness in between. The results can be considered as an exceptional performance when compared to the existing low power scale CPT system achievements. In conclusion, the research outcomes portray the feasibility and the potential of CPT as an emerging contactless power transfer solution in BID applications, as well as the theory and the practical design methods that establish a solid foundation for future CPT research and development.