E类功率放大器由于具有拓扑简单、适用频率高、电能转换效率高等优点，是高频MHz无线输电系统的理想电源。本文详细分析了四线圈无线输电系统的传输特性，提出了其传输效率的优化设计方法。同时，考虑到E类功率放大器的工作状态，提出通过激励线圈与发射线圈的距离调节，实现其输入电阻的完美匹配。搭建了采用2.81MHz的E类功率放大器的四线圈中距离无线输电系统。当传输距离为传输线圈边长的3.6倍时，系统电源端到负载端的整体电能传输效率为8.5%。

E-class power amplifier can be the ideal high-frequency power supply due to the advantages of simple topology, high working frequency, high efficiency and so on. This paper analyzes the transfer characteristics of four-coil WPT system in detail and proposes the optimal design method of the high transfer efficiency. Meanwhile, taking the working status of E-class amplifier into account, the perfect matching of input resistance is achieved by adjusting the distance between driving coil and transmitting coil. A 2.81MHz four-coil mid-range WPT system adopting E-class amplifier is setup. When the transfer distance is 3.6 times of the side length of the transfer coil, the overall transfer efficiency from source supply to the load can be 8.5%.

TM724

基于磁场电场混合方式的动态无线供电系统电能与信号并行传输方法