输出与变压器参数完全解耦的S/SP补偿IPT系统的最优增益点研究

Achieving adjustable load-independent output voltage completely decoupled from transformer parameters and optimal gain analysis of series/series-parallel compensated IPT converter

感应式无线电能传输系统的输出增益常受非接触变压器参数的制约而不可任意调节,且即便通过外加调节量实现了输出可调,也往往由于无法实现输出和变压器参数完全解耦而使得补偿参数计算复杂。本文基于三电容补偿的S/SP网络,给出实现增益可调下补偿参数新的推导办法,可实现输出电压与变压器物理参数完全无关,使得补偿参数设计简单明了。相比基于特定变压器模型的推导办法更为通用、可扩展至任意补偿网络。进一步,对增益可调S/SP系统的传输效率特性进行了深入分析,推导了可实现效率最大化的最优增益,相比传统的S/SP补偿方法可显著提升系统效率。最后,搭建实验样机验证了新型补偿参数设计方法的有效性以及最优增益对效率的提升作用。

The load-independent constant output of the wireless power transfer system usually depends on the physical parameters of the loosely coupled transformer, making the output gain fixed and unadjustable. Moreover, even if the output can be adjustable by adding an adjustment factor, the output is still related to transformer parameters, making the compensation parameters design complicated. Based on the S/SP compensation circuit, a new derivation method of the compensation parameters for achieving adjustable load-independent gain is presented, which can completely decouple the load-independent gain and the transformer’s parameters, making the parameter design clear and simple. Compared with the derivation method based on a specific transformer model, the proposed derivation method is more general and thus can be extended to any compensation network. Furthermore, the system efficiency of the S/SP converter is deeply studied and the optimal gain to achieve maximum efficiency is presented. The proposed compensation method can achieve a better efficiency than the conventional design. Finally, prototypes are constructed to verify the analysis and the effectiveness of the proposed compensation method.