负载阻抗特性对引信磁共振耦合无线装定系统传输特性影响

Influence of Load Impedance Characteristics on Transmission Performance of Fuze Wireless Setting System Based on Magnetic Resonance Coupling

接收端负载阻抗特性对引信装定系统的能量传输性能有重要影响,针对该问题建立了非纯阻性负载条件下的磁共振耦合无线装定系统电路模型,理论结合试验分析了负载阻抗特性对系统传输性能的影响规律。结果表明:负载中的容性或感性成分会使共振频率产生偏移,并对传输性能带来不利影响,其根本原因在于负载阻抗通过耦合映射会引起中继回路等效电容值或电感值的变化;负载阻抗角小于0°时,共振频率较纯电阻情况向下偏移,共振频率变小,随着阻抗角的增大,频率偏移量及对传输性能的影响程度逐渐减弱,当负载中电容成分增大到一定值后,这种影响可以忽略;阻抗角大于0°时,共振频率偏移特性相反,随着电感值的增大,负面影响越来越严重,最终会破坏收发端的共振耦合状态,造成装定结果失败;理论分析结果与试验结果吻合较好。

The load impedance characteristics of receiver have an important influence on the power transmission performance of fuze setting system.For this problem,a circuit model of a magnetic resonance coupling wireless setting system under condition of non-pure resistance load is established.The influence rules of load impedance characteristics on the transmission performance of the system are analyzed theoretically and experimentally.The result shows that the capacitive or inductive component of the load causes the resonant frequency to be offset and affects the transmission performance adversely.The basic reason is that the load impedance results in the variation of equivalent capacitance or inductance in the relay circuit through coupling mapping.When the impedance angle of load is less than zero,the resonant frequency is shifted downward and decreased.With the increase in impedance angle,the frequency offset and its influence on the transmission performance are gradually diminished.This influence can be ignored when the capacitance increases to a certain value.When the impedance angle is greater than zero,the resonant frequency offset is opposite.With the increase in inductance value,the negative influence is becoming more and more serious,which will eventually destroy the resonant coupling state of the system,causing the failure of setting.The proposed model is proved to be correct,and the theoretical result is consistent with the experimental result.