中文摘要：

相比于传统无线电能传输（WPT）系统，包络调制无线电能传输系统具有结构简单、控制方便的优点，但在研究中发现，包络调制无线电能传输系统的起振工作条件以及高频电能包络的质量受到系统的初始参数、负载动态变化等条件的影响，不可避免地影响系统能量的正常传输以及负载电能的品质。基于交流阻抗分析法，采用零电流开关（ZCS）控制，对系统状态变量展开时域分析，基于离散迭代方法旨在找到系统软开关起振边界与能量包络的谷值偏零程度，进而确定包络调制无线电能传输系统工作边界条件，仿真与实验结果表明，在边界范围内，系统始终工作在谐振软开关状态，能量包络质量良好，验证了理论分析的正确性。

英文摘要：

Compared to the traditional wireless power transfer(WPT)system,the wireless power transfer system based on envelope modulation has the advantages of simple structure and convenient control.However,the conditions such as the initial parameters and load variation will severely affect the oscillatory condition and the high frequency electric energy envelope quality of the wireless power transfer system based on envelope modulation.Thereby,the power transmission and the quality of load power would be affected inevitably.Based on ac impedance analysis method,zero current switching(ZCS)control technology was used to analyze the system state variables in time domain.The boundary for oscillatory condition and the zero-valley value of the energy envelope of system were obtained based on the discrete iteration method.Then,the operating boundary condition for wireless power transfer system based on envelope modulation was derived.Simulation and experimental results illustrate that the system always operates in resonant soft-switching state and keeps good quality of high frequency electric energy envelope within the scope of the boundary conditions.The results prove the validity of the theoretical analysis.