Double-layered snail-shaped PCB coil for wireless energy transfer and design method thereof

Abstract

The invention discloses a double-layered snail-shaped PCB (Printed Circuit Board) coil for wireless energy transfer and a design method thereof, and belongs to the technical field of wireless energy transfer. The technical scheme adopted is that the coil comprises a baseplate, a top layer coil, a bottom layer coil and a through-hole array, wherein the top layer coil is mounted on the baseplate; the bottom layer coil is mounted below the baseplate; and the through-hole array is positioned on the baseplate and used for connecting the top layer coil and the bottom layer coil. Meanwhile, the invention also provides a design method of the coil. According to the invention, a PCB technology is adopted to fabricate resonance coil for wireless energy transfer so as to ensure the precision and stability of self-resonant frequency of the coil; and meanwhile, the coils are placed on the upper and the lower layers of the PCB, so that larger inductance quantity is obtained in a limited baseplate size, the stray capacity of the coil is increased, and the self-resonant frequency is reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless energy transmission, and in particular relates to a double-layer spiral PCB coil for wireless energy transmission and a design method thereof. Background technique [0002] Magnetically coupled resonant wireless energy transfer technology has developed rapidly in recent years. Compared with traditional inductive wireless energy transmission, this technology can extend the transmission distance to 2 to 3 times the diameter of the coil while maintaining a transmission efficiency of more than 50%, and has better electromagnetic compatibility. In this transmission system, the transmitting coil and the receiving coil are self-resonant coils with the same resonance frequency, and the design has the following requirements: [0003] 1. It has high mechanical stability and design and manufacturing precision to ensure the accuracy of its self-resonant frequency; [0004] 2. It has a certain amount of str...

AI Technical Summary

Problems solved by technology

[0005] 3. Improve its quality factor (Q value) as much as possible, this parameter will greatly affect the transmission distance and transmission efficiency;

[0008] At present, although there have been wireless energy transmission systems using PCB resonant coils at home and abroad, most of them are simple single-layer coils with small inductance and stray capacitance, which makes the self-resonant frequency too high; System design and optimization of its self-resonant frequency, quality factor and other parameters

For the analysis and design of PCB coil characteristics considering stray parameters, most of the existing methods are aimed at other fields such as current transformers and RFID. These design methods and ideas cannot be well used for magnetically coupled resonant wireless energy in transmission

Images