Resonant-Based Wireless Power Transfer System Using Electric Coupling for Transparent Wearable Devices and Null Power...

Area of Science:

• Electrical Engineering
• Materials Science
• Electromagnetics

Background:

• Wireless power transfer (WPT) systems require efficient energy transmission components.
• Copper plates are commonly used as couplers, but alternative materials are sought for improved performance and cost-effectiveness.
• Understanding null-power points is crucial for optimizing WPT system efficiency.

Purpose of the Study:

• To evaluate the transfer efficiency of four-plate-structured copper plate and metal mesh sheet couplers.
• To identify the primary causes of the null-power point phenomenon in electrical resonance WPT systems.
• To compare the performance of metal mesh couplers against traditional copper plate couplers.

Main Methods:

• Equivalent circuit model analysis was employed to understand coupler behavior.
• Experimental fabrication and testing of both copper plate and metal mesh couplers were conducted.
• High-Frequency Structure Simulator (HFSS) was used for detailed electromagnetic simulations.

Main Results:

• Metal mesh sheet couplers demonstrated performance equivalent to copper plate couplers.
• The null-power point phenomenon was found to be predominantly influenced by the coupler structure.
• Both main and cross-coupling between transmitter and receiver dictate the null-power point.

Conclusions:

• Metal mesh material is a viable and effective alternative to copper plates for WPT couplers.
• The coupler's structural design is the key determinant of performance and the occurrence of null-power points.
• Optimizing coupler structure can mitigate null-power points, enhancing overall WPT system efficiency.