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The wireless power transfer (WPT) system will usually contact with the metal environment in military applications. Adjacent large metal plates will result in severe deviation of system parameters and degradation of system performance. Therefore, in order to solve the above problems, an optimization method of additional ferrite is proposed in this paper based on the magnetic field aggregation to decrease the influence of metal plates. First, the characteristic of influence caused by metal plates is analyzed through circuit theory and the optimization goal is pointed out. Then, the influence characteristic of the typical metal surface plate and the curved plate is obtained by the FEM simulation. Subsequently, the optimization scheme is investigated based on magnetic field aggregation. By analyzing the adjustment rules of multiple design parameters, the optimization scheme is formed ultimately. Based on the optimization scheme, the maximum 33% deviation of the system parameter is completely corrected and the transmission performance index parameter is improved according to the simulation. In addition, an improved strategy is proposed to reduce the system eddy current loss. Finally, the influences of metal plates and the beneficial effect of the optimization scheme are verified by the experiment. The effectiveness of the improved scheme for eddy current loss is also verified. The experiment results demonstrate that the deviation of system parameters is completely corrected and the transmission performance index parameter is improved by 5.54%.

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A Transmission Performance Optimization Method of Wireless Charging System Under Adjacent Large Metal Plate Environment Based on Magnetic Field Aggregation