Development of 6.78MHz shielded coupler for capacitive wireless power transfer

Aris, Mohammad Safiuddin (2023) Development of 6.78MHz shielded coupler for capacitive wireless power transfer. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Wireless power transfer (WPT) has emerged as a promising technology, offering the convenience of charging electronic devices without physical connections. Capacitive wireless power transfer, in particular, eliminates the need for cables or connectors, enabling power transfer without direct contact. This approach facilitates charging in diverse settings such as vehicles, public spaces, and locations where conventional power outlets are challenging to access. The primary goal of this study is to design a shielded coupler specifically tailored for 6.78MHz capacitive wireless power transfer. This targeted frequency addresses concerns related to bulk and health risks associated with lower frequencies. The aim is to create a lightweight shielded coupler capable of efficient and secure wireless power transfer, ultimately reducing dependence on wired charging for various applications. To achieve the objectives, a four-plate configuration is proposed, incorporating two shielding plates operating at 6.78 MHz. Additionally, the project involves the development of a copper plate coupler structure for 6.78 MHz capacitive wireless power transfer (CWPT). The analysis of the coupler structure is conducted using an LT Spice simulation circuit for the charging system. The performance evaluation of the created coupler structure is carried out through an experimental setup. The study focuses on the practical implementation of capacitive wireless power transmission for charging systems, utilizing a model developed with the LT Spice program. The proposed four-plate configuration, including shielding plates at 6.78 MHz, aims to address concerns related to bulk and health risks. The performance of the copper plate coupler structure is assessed through both simulation and experimental setups. This research underscores the potential of capacitive wireless power transfer at 6.78 MHz, offering a solution to issues associated with lower frequencies. The designed shielded coupler demonstrates efficiency and safety in wireless power transfer, presenting a viable alternative to traditional wired charging methods. The findings contribute to the advancement of capacitive interfaces for wireless charging stations, emphasizing their cost-effectiveness and user-friendly nature in various applications.

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