The current-fed inductively power transfer (IPT) system, aiming at the Output- Voltage-instability problem on a dynamic load, based on the constant transimpedance gain characteristics of the primary side control method is proposed. Taking current-fed IPT system with parallel-primary and parallel-secondary (PP) compensate as an object, by building and analyzing the mutual inductance equivalent circuit, had the characteristics of constant-transimpedance-gain under certain working conditions are derivated. And the efficiency characteristics of PP compensated resonant network are analyzed, optimization of resonant network parameters make the system constant- transimpedance-gain frequency for the efficiency of the optimal frequency. In order to maintain the constant input bus current, the constant-current control system is added in the traditional current-fed IPT topology, and the principle of constant-current control is described. This paper gave design steps based on the novel control method under given conditions. Finally, designed a 80W prototype, the experimental results are in good agreement with the theoretical analysis and the correctness of the circuit topology and control strategy is verified.%针对电流型感应电能传输（IPT）系统负载变化时输出电压的稳定性问题，提出一种基于恒定跨阻增益特性的原边控制方法。以电流型IPT系统采用初次级并联（PP）补偿为研究对象，建立其互感等效电路并进行分析，推导出在特定工作条件下该拓扑具有恒定跨阻增益特性。并进一步分析了PP补偿谐振网络的效率特性，优化谐振网络参数使系统恒定跨阻增益频率为效率最优频率。为保持原边输入直流母线电流恒定，在传统电流型感应电能传输拓扑中加入恒流控制系统，并阐述了恒流控制原理。本文还提出了基于新型控制方法在给定条件下的IPT系统综合设计方法。最后，设计一台80W样机，实验结果与理论分析良好吻合，验证了论文所提控制方法的正确性。
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