基于超材料的高效率多源无线充电系统的研究

Research on High Efficiency Multi-source Wireless Charging System Based on Metamaterials

对于多发射源无线充电系统来说,发射线圈与接收线圈间的错位会导致互感急剧下降,使得传输效率降低。为提升多源无线充电系统的效率,首先,分析多发射线圈间相对位置与传输功率的关系,找出取得最大功率输出的条件;然后,设计出一种新型宽边耦合正方形螺旋结构的电磁超材料,增强收/发线圈间消逝波强度,在不改变传输系统本身的情况下有效提升传输效率;最后,搭建双源磁谐振式无线电能传输系统实物平台进行验证。实验结果表明:相比于单源系统,双源系统传输效率提高约15%;当收/发端线圈夹角为40°时,双源系统传输效率达到最高,为41.4%;添加超材料可使系统传输效率有效提高约20%,添加三块超材料可提高约36%。

For the multi-input wireless charging system,the misalignment between the transmitting coils and the receiving coil will cause the mutual inductance sharply to decrease,which in turn will reduce the transmission efficiency.In order to improve the efficiency of the multiple-input system,the relationship between the relative positions of the multiple transmitting coils and the output power was analyzed to find out the conditions for abtaining the maximum power output,initially.Then,a new type of electromagnetic metamaterial with broadside coupled square-split resonators was designed to enhance the electromagnetic wave to improve the effectively without changing the transmission system itself.At last,an experimental verification platform was constructed.The results of the experiment confirme that two-transmitters system can improve efficiency about 15%,and efficiency is the highest about 41.4% when angle of transmitters and receiver is 40°,and addition of metamaterial can improve the efficiency by 20%,three metamaterials resulted in a higher improvement up to 36%.