谐振式无线电能传输中铁氧体屏蔽特性

针对磁耦合谐振式无线电能传输(magnetic coupled resonant wireless power transfer, WCR-MPT)中铁氧体屏蔽材料的设计和选取没有明确的指导方法,且铁氧体屏蔽材料的添加直接影响系统的传输性能,利用电路理论和麦克斯韦方程组进行数学建模,在Maxwell仿真平台上搭建了一个带有铁氧体屏蔽材料的磁耦合谐振式无线电能传输装置,并对铁氧体屏蔽材料添加之后线圈之间的互感和耦合系数、线圈本身的电阻和品质因数的影响进行了分析.最后,搭建硬件电路进行实验,探究不同覆盖面积、距离、形状下的铁氧体屏蔽材料对系统传输效率的影响.结果表明只在接收端全屏蔽且紧靠接收线圈时可以有效提高系统的传输效率.

Shielding characteristics of ferritesin WCR-MPT

Aimed at the lack of definite guidance method for design and selection of ferrite shielding materials during the process of magnetically coupled resonant wireless power transfer and the direct influence of the addition of ferrite shielding materials on the transmission performance of the system, mathematic modelling is carried out for the foregoing power transmission based on circuit theory and Maxwell equations, a magnetically coupled resonant wireless power transfer device with ferrite shielding material is built on Maxwell simulation platform, and the influence of addition of ferrite shielding materials on the mutual inductance and coupling coefficient between coils, the resistance and quality factor of the coil itself is analyzed. Finally, a hardware circuit is built for carrying out the test and explore the influence of ferrite shielding materials with different coverage area and shape and at different distance on system transmission efficiency. The result shows that the system transmission efficiency induction can be effectively improved only under the condition of full shielding of receiving end and close leaning on the receiving coil.