多负载磁耦合谐振式无线电能传输功效分析

Power and efficiency analysis of multi-load magnetic coupling resonant wireless power transmission

多负载磁耦合谐振式无线电能传输系统受到较多限制条件的约束,使系统的耦合机理十分复杂。为此,综合考虑了多负载无线电能传输系统电源内阻、发射线圈,以及接收线圈间的广义耦合因数、系统的失谐因子、接收线圈的数量等因素,利用电路理论建立多负载无线电能传输系统的数学模型,给出分裂频率的计算方法,得到限制多负载无线电能传输系统最大功率的条件。针对过耦合区域负载功率降低的问题,提出利用分裂频率的方法,在保证系统较高效率的前提下,有效地提高了负载的接收功率。最后通过仿真分析,验证了所提方法的正确性。

The multi-load magnetic coupling resonant wireless power transmission(MCR-WPT)system is constrained by many restrictive conditions, which makes the coupling mechanism of the system very complicated. In comprehensive consideration of the internal resistance of power source the multi-load wireless power transfer system,the generalized coupling factor between the transmitting coil and the receiving coil,the detuning factor of the system,the number of receiving coils and other factors,the mathematical model of multi-load wireless power transfer system is established by means of the circuit theory,the calculation method of splitting frequency is given,and the conditions for limiting the maximum power of multi-load wireless power transmission system are obtained. In allusion to the problem that the load power is reduced in the over-coupling region,a method of splitting frequency is proposed to improve the receiving power of the load under the premise of ensuring the high efficiency of the system. The simulation analysis is carried out to verify the correctness of the proposed method.