水下磁谐振式电能传输最大效率追踪方法

Maximum power efficiency tracking on underwater magnetic resonant wireless power transfer system

磁谐振式电能传输系统在海水中工作时电磁波受到海水强烈的衰减导致输出功率较低。同时,由于发射和吸收端的阻抗不匹配导致部分能量被吸收端反射进而被海水衰减,造成效率的进一步降低。为了提高系统的传输效率和减小能量损失,本文提出了一种输出稳定型最大效率追踪方法,不仅实现了最大效率追踪,还保证了在一定条件下传输效率的稳定,保护了负载。本文运用仿真软件建立模型,对该方法进行了仿真验证;设计并制作了一个谐振耦合传输装置,通过实验研究证明了该方法对水下电磁谐振电能传输系统效率有显著提高作用。

The output power of a wireless magnetic-resonance power-transfer system is relatively low underwater because of the rapid attenuation of electromagnetic waves in seawater. Furthermore,the receiving coil reflects some of incoming energy out into the seawater if the impedances of the transmission and receiving coils are mismatched. In order to achieve the maximum efficiency and reduce the power loss,we propose a new stable maximum-transfer-efficiency tracking method. Not only does this realize the most efficient tracking,it also ensures stable transfer efficiency under certain conditions and can protect the load. We use simulation software to establish a model with which to test the correctness of the system and the method,and we design and fabricate a resonant-coupling transfer system.The experimental results show that the method can improve the transfer efficiency of a wireless power-transfer system significantly.