基于PCB线圈的无线传输系统功率与效率分析(英文)

Power and Efficiency Analysis of a PCB Based Wireless Power Transfer System

PCB线圈在无线传能系统中适用于空间和高度有限的领域,PCB线圈有着高精度、高一致性和易于设计和制作等优点。本文利用二端口网络和ABCD参数对基于PCB线圈的无线传能系统进行了系统的研究。为了使负载达到最大功率,采用阻抗匹配模式和最大负载功率模式进一步简化了负载功率与传输效率计算、优化补偿电容。根据系统原理与仿真优化结果,设计了针对不同负载的基于PCB线圈的传输功率为5W的无线传输系统实验原型。通过上述两种模式针对不同负载测试和对比,无线传输系统实验原型在两种模式下均可以达到理想的负载功率,传输效率高于90%。

Printed circuit board(PCB) based wireless power transfer(WPT) systems are suitable for applications where stringent space and height requirements have to be met. The PCB based WPT systems have many advantages, such as high precision, high consistency and easy to design and manufacture. In this paper, we developed a systematic approach to study PCB based WPT systems for low power applications using 2-port network theory and ABCD-parameters. In order to reach the maximum load power, we further simplify the load power and efficiency, and optimize the compensation capacitance and the matching network using the impedance matching mode and the maximum power mode. Using the optimized results from the theory and simulations, the prototypes of a 5W WPT system based on a printed circuit board(PCB) was designed and fabricated for the different load. The load power and transmission efficiency with different load in two modes were measured and compared, the test results show that the prototypes can reach the ideal load power, and transmission efficiency also more than 90% through above two modes.