中文摘要：

以电磁感应式无线充电系统为研究对象,搭建了由线圈和隔磁片组成的电磁感应测试平台,通过线圈和隔磁片的不同组合模式探究隔磁片对系统的作用.在无隔磁片的模式下,当线圈距离h从1.0 mm增大到9.2 mm时,系统的耦合系数k值由0.77下降到0.30.实验发现在发射端附隔磁片可明显提高系统的k值,因为发射端的隔磁片很好的束缚住了线圈及隔磁片产生的磁力线,使穿过接收线圈的磁力线比例增高.在发射和接收端均附隔磁片的模式下,信号频率f=1 MHz,h=9.2 mm时k值仍有0.42,明显高于无隔磁片模式.在接收端附隔磁片可明显提高η值,这是由于接收端的隔磁片能够在发射端产生的磁场中感应出更多的磁力线,使得接收线圈的磁通量变化率提高.同时由于隔磁片自身损耗的产生,对系统的η值造成一定影响.

英文摘要：

A from ferrite on the test platform was built to investigate the impact of magnetic shielding pieces made electromagnetic induction type wireless charging system in different combination modes with the coils. The values of coupling coefficient （k） from 0. 77 to 0. 30 while the coil dis- tances （h） increased from 1.0 mm to 9.2 mm under the mode without magnetic shielding piece. It was found that the magnetic shielding piece attached to the transmitter could significantly improve the value of k, because the magnetic field lines were well tied by magnetic shielding piece, and then the received proportion of the magnetic field lines increased. When the transmitter and the re- ceiver were both attached by the magnetic shielding pieces, the value of k was still 0. 42 at h = 9. 2 mm under f = 1 MHz, significantly higher than the value under the mode without magnetic shielding piece. The magnetic shielding piece attached to the receiver could effectively improve the value of η. It was because extra magnetic field lines were generated by the magnetic shielding piece at the receiver, and the variation rate of magnetic flux was increased in the receiving coil. Meanwhile, the magnetic shielding pieces had a certain negative effect on the value of η due to the loss of the material itself.