带E类功放的磁耦合谐振无线输电系统源线圈优化

首先为磁耦合谐振式无线输电系统设计了一款E类功放作为系统输入端电源。鉴于E类功放性能易受负载参数影响,通过优化无线输电系统源线圈结构来降低因E类功放特性造成的系统性能下降。提出了三类源线圈结构,在多负载情况下分别测试负载两端电压变化情况,对比研究各结构下负载间耦合情况对负载电压的影响和各结构下系统的传输效率。研究发现多源线圈单谐振结构能通过利用负载间的耦合来降低由磁场分布引起的负载电压变化。而在E类功放下,串联型分立的多源线圈多谐振结构易造成系统性能下降,负载间耦合对负载影响也十分明显。

Optimization of the Source Coil of Magnetic Coupling Resonant Wireless Power Transmission System with Class E Power Amplifier

At first, a class E power amplifier is designed for magnetic coupling resonant wireless power transmission system as the system power. Given that the class E power amplifier performance will be influenced by the load parameters, an optimization of the source coil structure of wireless transmission system is applied to reduce the drop of the system performance caused by class E power amplifier characteristics. Three kinds of the source coil structure are put forward and tested the change of voltage across the load in multiple load cases. The comparative study involves the structures' influence on the load voltage and the transmission efficiency of the systems under the load coupled condition. The study found that the structure of multiple source coils and single resonance coil can decrease the load voltage variation, caused by the magnetic field distribution, by using the coupling between loads. And under the class E power amplifier, the structure of series of multiple source coils and resonance coils will cause the drop of system performance easily, and the effects on the loads caused by the coupling are very obvious.