电磁感应式无线电能传输系统一次电流效率优化配置

Optimal Setting of Primary Coil Current for Efficiency in Electromagnetic Inductive Wireless Power Transfer System

电磁感应式无线电能传输系统在包含多个接收模块时通过保持一次侧发射线圈电流恒定可以实现多个二次侧接收模块间控制的解耦。当接收模块通过DC-DC控制输出电压时,一次线圈电流可以在一定范围内灵活设定,这也带来了效率优化的空间。该文建立一次电流与电磁耦合机构效率之间的定量关系,得到效率最大的一次线圈电流最优值。基于系统参数进行不同一次线圈电流下耦合机构效率的计算。搭建无线电能传输仿真系统和实验平台,仿真系统的耦合机构效率测量结果与理论计算结果相同,实验测量的效率变化规律和最大功率点也与计算及仿真结果基本一致,从而验证了提高无线电能传输系统电磁耦合机构效率的一次线圈电流优化方法的有效性。

The electromagnetic inductive wireless power transfer system including many secondary pick-ups can realize the decoupling control of pick-ups by keeping the primary coil current constant.When the pick-ups control their outputs by DC-DC regulators,the primary track current can be set flexibly within certain range,which offers the potential to optimize the efficiency.In this paper the quantitative relationship between the primary coil current and the efficiency of the electromagnetic coupling mechanism is deduced,and the optimal current for the maximum efficiency is found out.Based on the system parameters,the efficiencies under different primary currents are calculated.Simulation system and experimental platform are both set up.The measured efficiencies in simulation system are the same as the calculated efficiencies.The measured efficiency waveforms and the maximum efficiency point of the experimental platform are essentially consistent with that of the calculation and simulation system.So the effectiveness of the primary coil current optimization method for increasing the efficiency of the coupling mechanism of electromagnetic inductive wireless power transfer system is proved.