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该文根据电路理论分析谐振式无线电能传输磁耦合系统的耦合电感模型和变压器T网络等效模型,得出磁耦合系统可以以不同等效变比表达的机理.提出对给定的磁耦合系统,通过补偿参数设计可使WPT系统实现任意恒压增益的新思路.基于变压器T网络四参数模型中参数(包括等效原边漏感Lpk,等效副边漏感Lsk,等效激磁电感Lm和等效变比n)的多解性,建立原边等效漏感、副边等效漏感及等效激磁电感与等效变比n的函数关系.通过对不同变比n下对应漏感的谐振补偿设计补偿参数,可使WPT系统获得不同的电压增益.该设计思路物理概念清晰,模型简单明了,有助于有效拓宽输出电压的变化范围.在输入、输出及开关频率不变的情况下,可实现磁耦合系统线圈匝数及尺寸的减小,有利于磁耦合系统小型化设计.实验结果验证了理论分析的正确性和可行性.“,”This paper analyzed the coupled inductor model and the transformer T model of the magnetic coupling system in the wireless power transfer (WPT) based on the circuit theory.The principle of the different equivalent ratio by the same magnetic coupling system was got.And a new idea is proposed in which any constant WPT voltage gain can be got by compensation network design for a given magnetic coupling system.According to the multi-solutions of the transformer T model (including the equivalent leakage inductance in primary winding Lpk,the equivalent leakage inductance in secondary winding Lsk,the equivalent exaction inductance Lra and the equivalent ration n),the relationship between the Lpk,Lsk,Lm and n were established.By designing the compensation parameters for the resonant compensation of the corresponding equivalent leakage inductance at different equivalent ratio n,the WPT system could obtain variable voltage gain.The design concept is clear and the model is simple which can help to effectively broaden the range of output voltage gain.With the same input,output and frequency specification,the winding turns and the size of the magnetic coupling system can be reduced which is good for the footprint reduction of the magnetic coupling system.Finally,the experiment results verified the theory analysis to be correct and useful.