渐变屏蔽层在传感器无线充电系统中的应用

Research on application of gradient shielding layer in wireless power transfer

针对传感器无线充电系统中屏蔽层过重、磁耦合结构温升的问题,提出了一种用于传感器无线充电系统的渐变型屏蔽层结构。传统的圆环屏蔽层可提升系统效率但也会降低系统的灵活性并拉高磁耦合结构的温升,渐变屏蔽层的应用可提升系统灵活性,减小温升和磁泄漏对传感器性能的干扰。通过仿真对采用渐变屏蔽层和圆环屏蔽层的系统的传输效率、磁屏蔽效果和温度分布情况进行比较。结果表明:应用渐变屏蔽层的系统效率增幅相对于应用圆环铁氧体的系统降低了15%,但其磁耦合结构重量降低了43%;应用渐变屏蔽层的磁耦合结构的稳定温升降低了17%,温度分布也更加均匀,提升了传感器无线充电系统的灵活性和安全性。

Aiming at the problems of heavy shielding layer and temperature rise of magnetic coupling structure in sensor wireless power transfer system a gradual shielding layer structure applied to sensor wireless power transfer system is proposed.The application of gradual change shielding layer can improve the flexibility of the system and reduce the interference of temperature rise on sensor performance.The traditional ring shielding layer can not only improve the efficiency, but also reduce the flexibility of the system and increase the temperature rise of the magnetic coupling structure.Through the simulation, the transmission efficiency, magnetic shielding effect and temperature distribution of the system with gradient shielding layer and ring shielding layer are compared.The results show that the system efficiency with gradient shielding layer is reduced by 15 % compared with the system with ring ferrite, but the weight of magnetic coupling structure is reduced by 43 %;the stable temperature rise of magnetic coupling structure with gradient shielding layer is reduced by 17 %,and the temperature distribution is more uniform, which has higher flexibility and security.