Research on Resonant Wireless Energy Supply Double-Layer Receiving Coupler for Portable Electronic Equipment

Abstract

In order to reduce the electromagnetic interference on the receiving side of electronic equipment in the process of wireless energy supply, a magnetic coupling resonant wireless energy supply system for portable electronic equipment with double-layer PCB coil structure is designed under 100 kHz. Firstly, the circuit principle is analyzed, and the LCC-P compensation circuit model is established. Then, the coil model is constructed. The effects of turns and wire diameter on the coil self inductance and coupling coefficient are analyzed. The best parameters are selected, and the magnetic field distributions of the three coil structures at different distances are simulated and studied. Finally, an experimental platform is built to study the transmission efficiencies of different receiving coils with different spacings. The magnetic field intensitiwa at different positions are compared to further verify the performance of double-layer coils. The experimental results show that when the coil spacing is in the range of 4-16 mm, the efficiency of the WPT system can reach 40%-71%. The strength of the central magnetic field of the coil is increased by 16%, and the external magnetic field is reduced by more than 20%. The temperature rise of one hour charging is 5.34 • , which is only 0.78 • higher than that of other coils.

Research on Resonant Wireless Energy Supply Circular Reactive Shielding for Small Electronic Equipment

“…Magnetic field shielding can be classified as material shielding [8][9][10][11][12][13] and coil shielding for material shielding, and the high conductivity of copper and aluminum metal plates will lead to eddy current losses, significantly reducing system efficiency. Adopting high permeability low-loss ferrite materials can enhance the system's performance and reduce the magnetic field leakage between systems.…”

Study of a Double-layer Passive Magnetic Shielding System for Electric Vehicle WPT

“…A WPT system has a high level of security, high space availability, nonabrasiveness, etc. It has been widely used in implantable medical devices [5], rail transportation [6], electric vehicles [7][8][9][10], etc. The development of this technology breaks the limitations of traditional wired electrical energy transmission.…”