摘要
针对三线圈磁谐振无线输电系统,基于互感耦合模型建立系统等效电路,推导系统在谐振状态下各级线圈的反射阻抗与效率,并进一步分析系统整体效率与工作频率、线圈互感、线圈内阻以及负载大小的关系,得到三线圈磁谐振式无线输电系统效率最优条件,为系统整体设计与参数优化提供理论依据。然后,在最大线圈尺寸与净传输距离一致时,将三线圈磁谐振式无线输电系统与两线圈磁谐振式无线输电系统进行比较,分析三线圈系统效率优于两线圈系统时的条件及其效率提升能力。最后,搭建了一套三线圈无线输电平台并对理论分析进行实验验证。
Based on the mutual inductance coupling mode and equivalent circuit theory,the reflected impedances and efficiencies of each coil are given for a three-coil magnetic resonance wireless power transfer system.Considering operating frequency,mutual inductance,coil resistance and load impedance,the optimal condition of efficiency of the three-coil magnetic resonance wireless power transfer system is analyzed,which can provide the theoretical basis for further design and parameter optimization.Besides,compared with the traditional two-coil wireless power transfer system with the same transmission distance and coil size,the efficiency promotion condition and ability are also calculated and analyzed.Finally,a three-coil wireless power transfer system is built to verify the theoretical analyses.
引文
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[3]姜燕,黄禹,李中启,等.三线圈磁谐振式无线输电系统传输效率的优化[J].电力电子技术,2014,48(12):75-77.