长距离无线传能系统最大效率点分析与验证

The analysis and verification of the best efficiency point of long distance wireless energy transmission System

针对现存长距离磁耦合谐振式无线电能传输系统传输普遍存在效率低的问题,对系统的谐振拓扑电路结构、线圈耦合系数、线圈内阻等因素进行了综合分析。采用阻抗匹配和屏蔽方法,通过对串联式谐振进行建模分析以及传输效率的计算,得到最大效率点的匹配阻抗值,并采用铝板包围线圈的方法减少漏磁通,进而减小传输损耗。通过理论分析、模拟仿真和实验验证可知,当传输距离为1 m且阻抗匹配负载为53Ω时,无线电能传输效率最大,可达78.9%。

For the common inefficient transmission problem in the existing long distance magnetic coupling resonant wireless power transmission system,the resonant topology circuit structure,coil coupling coefficient,coil internal resistance and other factors of the transmission system are comprehensively analyzed.Impedance matching and shielding methods are adopted.Through modeling analysis of series resonance and calculation of transmission efficiency,the matching impedance value of the maximum efficiency point is obtained.The aluminum plate is used to surround the coil to reduce leakage flux,thus reducing transmission loss.Through theoretical analysis,simulation and experimental verification,the maximum wireless power transmission efficiency is 78.9%when the transmission distance is 1 meter and the impedance matching load is 53Ω.