移动式直流应急无线充电模块的磁芯优化设计研究

采用无线电能传输是开展移动式直流应急保障的有效途径。提出了一种适用于移动式直流应急无线充电模块的铁氧体磁芯设计和优化方法,可进一步提高发射器与接收器之间的未对准误差容限、降低磁芯损耗。当无线充电模块发射器与接收器之间存在未对准误差时,磁通密度不再均匀,磁芯损耗也随之增加。因而,应通过磁芯优化设计使得磁芯各处磁通均匀分布以及损耗降低。经综合考虑,提出了一种分段线性圆形和附加条形磁芯的优化结构,并提出基于有限元连续非线性规划优化算法,可使得磁通密度分布均匀和降低损耗。经仿真验证,与原始磁芯结构相比,优化后的圆形磁芯结构可降低单位体积磁芯损耗,另加附加条形磁芯优化后可使单位体积磁芯损耗降低39%,并且优化后的磁芯,单位损耗的磁芯体积可减少17. 5%。

Research on the Optimization Design of Magnetic Core in Mobile DC Emergency Wireless Power Charging Module

Applying wireless power transfer technology is one of effective approaches for conducting mobile DC emergency protection. The main work of this paper is to propose a ferrite core design and optimization method for mobile DC emergency wireless power charging module, which can further improve the misalignment tolerance between the transmitter and the receiver and reduce the core loss. The optimized design is developed to maintain uniform magnetic flux density in the core and to minimize the core loss. Considering the misalignment error between the transmitter and the receiver when the car is parked, the magnetic flux density will change. Therefore, the misalignment error and the misalignment direction probability should be further optimized. After comprehensive consideration, the optimized structures of the circular and bar cores are finally designed, and a continuous nonlinear programming optimization algorithm in FEA is proposed to make the flux density distribution uniform. It is verified that compared with the original magnetic core structure, the core loss per unit volume of the optimized circular core is reduced by 30%, and the core loss per unit volume of the bar core is optimized by 39%. Moreover, the optimized circular core can reduce the volume of the core loss per unit by 17.5%.