无线电能传输系统阻抗动态补偿机理及实现方法

摘要

In view of the problem that transmission performance of wireless power transmission system is deteriorated with change of coupling distance in over-coupled region and in order to achieve the maximum power output with fixed-frequency mode,a new method was proposed which achieves impedance dynamic compensation by changing the generalized coupled factor variable of two planar spiral coils in primary coil circuit,and the mechanism of impedance dynamic compensation strategy were studied.Firstly,taking E-type double-tube LLC resonant inverter circuit as research object,circuit theory was used to establish model and analyze system output power,transmission efficiency and interaction mechanism of characteristic parameters;the variation law of system output power curve and transmission efficiency curve of the system were obtained,and it is concluded that the generalized coupling factor between two compensation coils has a direct impact on the system output power curve and transmission efficiency curve.Secondly,the mechanism of impedance dynamic compensation strategy was revealed,and an implementation program with fixed-frequency mode was presented.In the end,the correctness and validity of the theoretical analysis were verified by experiments.%针对无线电能传输系统在过耦合区因耦合距离变化导致传输性能劣化的问题,为了以定频方式实现最大功率输出,提出通过调节初级回路内的2个平面螺旋线圈间广义耦合因子变量实现系统阻抗动态补偿的方法,并对阻抗动态补偿机理进行了研究.首先,以一个E类双管LLC谐振逆变电路为研究对象,采用电路理论建模并分析系统输出功率、传输效率与特性参数的相互作用机理,获得了系统输出功率特性曲线与传输效率特性曲线的变化规律,得到了2个补偿线圈之间的广义耦合因子对系统输出功率曲线和传输效率曲线的直接影响关系;其次,分析了阻抗动态补偿机理,给出了系统在定频工作方式下的具体实施方案;最后,通过实验验证了理论分析的正确性和有效性.