Abstract
Magnetic resonant coupling (MRC) is one of the techniques that are widely used in wireless power transfer (WPT) systems. The technique is commonly used for enhancing distance while maintaining power transfer efficiency (PTE). Many studies have investigated new technologies to extend the distance of MRC while maintaining high PTE values. The most promising technique to date in MRC is the addition of a resonator between the transmitter and the receiver coil. The implementation of the resonator varies based on different designs, sizes, and material types, although the outcomes remain unsatisfactory. By introducing dielectric material resonators, PTE can be improved by lowering the ohmic loss which becomes a problem on conventional resonators. This study presents a general overview on the use of dielectric material as a resonator in MRC WPT technology and its technological development. The basic operation of MRC WPT is summarized with up-to-date technical improvements related to dielectric material as a resonator in the field of WPT. An overview of the current limitations and challenges of this technique is also highlighted in this study.
Highlights
Azuwa Ali,1 Mohd Najib Mohd Yasin,2 Wan Fahmin Faiz Wan Ali,3 Norsuria Mahmed,4 Muhammad Ramlee Kamarudin,5 Ismahayati Adam,2 Muzammil Jusoh,2 Hasliza Abdul Rahim,2 Shing Fhan Khor,1 Nurulazlina Ramli,6 and Norshamsuri Ali 2
Magnetic resonant coupling (MRC) is one of the techniques that are widely used in wireless power transfer (WPT) systems. e technique is commonly used for enhancing distance while maintaining power transfer efficiency (PTE)
By introducing dielectric material resonators, PTE can be improved by lowering the ohmic loss which becomes a problem on conventional resonators. is study presents a general overview on the use of dielectric material as a resonator in magnetic resonant coupling wireless power transfer (MRC WPT) technology and its technological development. e basic operation of MRC WPT is summarized with up-to-date technical improvements related to dielectric material as a resonator in the field of WPT
Summary
WPT systems are classified into two categories based on their transmission technique: far-field and near-field transmissions. E basic operation principle of the WPT system consists of 2 coils: (a) the transmitter at the source and (b) the receiver at the output. For MRC, the basic 2-coiled WPT system consists of two or multiple resonators (usually two) placed between the transmitter and receiver coil, generally known as coils. The two circuits work in near-perfect transfer harmony as indicated by the equation as follows:. E transmitter, receiver coil, and dielectric resonator can be realized by independent equivalent RLC circuits as stated above, with each responding to a certain resonant frequency. E equation as follows is calculated for S21 (theoretical) which compromises the value of the Q factor to prove that the Q factor affects the WPT efficiency. To evaluate the overall WPT system performance, the PTE is calculated using the following equation: S21 dB 20 log S21,. Studies employing the dielectric resonator in WPT are relatively scarce, and new insights can be unraveled to enhance the overall MRC WPT system
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