提供可靠稳定的电能仍是实现多功能胶囊内窥镜的最大技术阻碍。针对传统D类逆变器效率低的问题，本文设计了一种适用于无线胶囊内窥镜的E类无线能量传输系统。首先，介绍了E类无线供能系统的工作原理。然后结合设计公式和电路仿真实验确定了E类逆变器的元件参数。最后搭建了实验平台，验证了有限元仿真的准确性并评估了系统在中心平面的性能。对比实验结果表明，当接收线圈位于中心处时，E类无线能量传输系统能够提供781 mW的功率，与D类逆变器相比，能量传输效率从5.39%显著提升至7.81%。此外，接收线圈在中心平面工作时，可持续接收500 mW以上的能量。

Providing reliable and stable power is still the biggest technical obstacle to realize multifunctional capsule endoscopes. Aiming at the low efficiency of traditional Class D inverter, this paper designs a Class E wireless power transfer system for wireless capsule endoscopy. Firstly, the working principle of Class E wireless power supply system is introduced. Then the component parameters of Class E inverter are determined by combining the design formula and circuit simulation experiment. Finally, an experimental platform was built to verify the accuracy of the finite element simulation and evaluate the performance of the system in the center plane. Comparative experimental results show that the Class E wireless power transfer system is capable of delivering 781 mW of power when the receiving coil is located at the center, which significantly improves the power transfer efficiency from 5.39% to 7.81% compared with the Class D inverter. In addition, the receiving coil can continuously receive more than 500 mW of energy when operating at the center plane.