线圈半径对磁耦合谐振式无线电能传输特性的影响

The Influence of the Coil Radius on Magnetic Coupled Resonant Wireless Power

磁耦合谐振式无线电能传输系统的传输特性受电源频率f、两线圈之间的互感M和负载RL的影响,且传输功率在强耦合区存在频率分裂现象。本文研究线圈半径对系统的传输特性的影响,对比分析了两种不同线圈半径情况下系统随电源频率变化的功率传输特性和随距离变化的效率特性。并通过实验验证,得到结论:在谐振线圈电感不变的情况下,线圈半径更大的谐振线圈具有更远的有效传输距离(临界耦合距离);在电源频率恒定为线圈固有自谐振频率时,随着传输距离的增大,系统传输功率均先增大后减小,而系统的效率随距离的增大而单调减小,且在相同效率时线圈半径更大的系统能够达到更远的传输距离。

Transmission characteristics of Magnetic Coupled Resonant Wireless Power can be affected by the power frequency f, mutual inductance M between two coils and the influence of load RL, and the transmission power in strong coupling zone exists frequency division phenomenon. In this paper, we study the influence of the coil radius on the transmission properties of system, analysis of the two kinds of different radius of coil case system change with power frequency power transmission characteristics and efficiency characteristic of the changing with distance. The results are verified by experiments: in the case that the inductance of the resonant coil is constant, the resonant coil with a larger coil radius has a further effective transmission distance (critical coupling distance). For coil inherent in power frequency constant when the resonant frequency, with the increase of transmission distance, system transmission power were first increases then decreases, and the efficiency of the system decreases monotonously with the increase of distance, and at the same efficiency when the coil radius greater system can achieve further transmission distance.