动态IPT系统后级稳压器的小信号模型修正和改进控制策略

针对单轨动态无线供电系统，在考虑整流桥前的电流断续及副边谐振电路寄生参数的影响下，分析了整流电压与负载的关系，指出因负载变化导致的整流电压大范围波动给后级稳压器的建模和闭环参数设计带来了挑战。为使后级稳压器小信号模型描述得更为准确，考虑了副边谐振电路的影响，引入幅值/频率修正系数，对后级稳压器小信号模型的低频段增益和中频段谐振峰频率进行了修正。在此基础上，为进一步提高系统的变负载动态响应能力，提出加入整流电压前馈环节。仿真与实验结果验证了理论分析的正确性和所提方案的有效性。

Modification of small signal model and improvement of control strategy for post-stage voltage regulator in dynamic IPT system

For the mono-rail dynamic wireless power transfer system, considering the influence of the discontinuous current of the rectifier and the parasitic parameters of the secondary resonant circuit, the relationship between the rectified voltage and the load is analyzed. It is pointed out that the large range of rectified voltage fluctuation caused by load changes brings challenges to the modeling and closed-loop parameter design of the post-stage voltage regulator. In order to describe the small signal model of the post-stage voltage regulator more accurately, the influence of secondary side resonant circuit is considered, and the amplitude/frequency correction coefficient is introduced to correct the low-frequency gain and the mid-frequency resonant peak frequency of the small signal model of the post-stage voltage regulator. On this basis, in order to further improve the dynamic response capability of the system to variable loads, a rectifier voltage feedforward link is added. Simulative and experimental results verify the correctness of theoretical analysis and the effectiveness of the proposed scheme.