基于LCC/N磁集成补偿网络的强耦合无线充电系统研究

Research on Strong Coupling Wireless Charging System Based on LCC/N Magnetic Integrated Compensation Network

针对无线充电系统在接收端电路复杂和发射端补偿电感占据体积较大的问题,本文中提出了在近距离条件下采用LCC/N磁集成补偿网络的强耦合无线充电系统。LCC/N磁集成拓扑兼备了接收端无补偿和发射端补偿电感磁集成的优点,使得无线充电系统更加紧凑,并可以改善系统的偏移性能。首先考虑LCC/N磁集成拓扑与接收线圈交叉耦合的关系对WCS系统进行建模。然后分析了在不同负载和偏移的工况下采用LCC/N磁集成拓扑系统的输出功率、传输效率和软开关等特性。最后,搭建了500 W的实验样机对上述的分析结果进行了验证。结果表明,在线圈沿y方向偏移时,应用LCC/N磁集成拓扑的输出功率高于应用传统非磁集成拓扑的输出功率,改善了偏移性能;另外,采用LCC/N磁集成拓扑还可通过调节原边非谐振补偿电容实现输出功率的调节,在正对齐和偏移的条件下最高效率分别达到了94.5%和95.8%。

In view of the complex circuit on the receiving side and the large volume of compensation inductance on the transmitting side of wireless charging system(WCS),a strong coupling WCS using LCC/N magnetic integrated compensation network and for being used in short distance condition is proposed in this paper.The LCC/N magnetic integrated topology combines both the advantages of no compensation circuit at receiving side and compensation inductor magnetic integration at transmitting side to make the WCS more compact and improve its coil offset performance.Firstly,the model for WCS is established with consideration of the cross-coupling relationship between the LCC/N magnetic integrated topology and the receiver coil.Then,the output power,transmission efficiency and zero-voltage-switch characteristics of the WCS with LCC/N magnetic integrated topology are analyzed under the condition of different loads and offsets.Finally,a 500 W experimental platform is built to verify the results of above analysis.The results show that when the coil offset is along y direction,the output power of system with LCC/N magnetic integration topology is higher than that of system with traditional non-magnetic integrated topology,thus its offset performance is improved.In addition,the adoption of LCC/N magnetic integrated topology can also achieve the adjustment of output power by changing the non-resonant compensation capacitor in primary side,with its highest efficiency reaching 95.8%and 94.5%respectively under the condition of with and without offset.