Low-Harmonic-Contents and High-Efficiency Class E Full-Wave Current-Driven Rectifier for Megahertz Wireless Power Transfer Systems
Low-Harmonic-Contents and High-Efficiency Class E Full-Wave Current-Driven Rectifier for Megahertz Wireless Power Transfer Systems
复制标题
适用于兆赫无线功率传输系统的低谐波含量和高效率 E 类全波电流驱动整流器
DOI：
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发表时间：
2017
影响因子：
6.7
通讯作者：
Chengbin Ma
中科院分区：
文献类型：
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作者：
Ming Liu;Minfan Fu;Chengbin Ma
目前，工作频率为兆赫 (MHz) 的无线功率传输 (WPT) 被广泛认为是中等功率中距离传输的有希望的候选者。人们已经努力通过组件级和系统级方法构建高效 MHz WPT 系统。然而，迄今为止，针对 MHz WPT 应用的高频整流器的讨论还很少。基于软开关的整流器，例如 E 类整流器，是 MHz 整流最有前途的候选器件之一。本文首次研究了 E 类全波电流驱动整流器在 WPT 系统中的应用。还开发了一个程序来优化整流器和 MHz WPT 系统的设计。为了进行比较，我们在总谐波失真 (THD)、效率、功率因数、电压/电流应力以及电压/电流传递函数方面研究了 E 类整流器和传统全桥整流器在应用于 6.78 MHz WPT 系统示例时的性能。仿真和实验结果表明，E类全波整流器的输入电压THD降低至全桥整流器THD的四分之一。在优化设计的MHz WPT系统中，与使用传统全桥整流器的系统相比，整流效率（超过91％）和整个系统效率（约80％）都有明显提高。
Wireless power transfer (WPT) working at megahertz (MHz) is now being widely considered a promising candidate for the midrange transfer of a medium amount of power. Efforts have been made to build high-efficiency MHz WPT systems via both component- and system-level approaches. However, so far there have been few discussions on high-frequency rectifier for MHz WPT applications. The soft-switching-based rectifiers, such as the Class E rectifiers, are one of the promising candidates for MHz rectification. This paper investigates the application of a Class E full-wave current-driven rectifier, for the first time, in WPT systems. A procedure is also developed to optimize the design of the rectifier and the MHz WPT system. For comparison purposes, the performances of both the Class E rectifier and the conventional full-bridge rectifier are investigated in terms of total harmonic distortion (THD), efficiency, power factor, voltage/current stresses, and voltage/current transfer functions, when being applied in an example 6.78-MHz WPT system. The simulation and experimental results show that the input voltage THD of the Class E full-wave rectifier is reduced to one-fourth of the THD of the full-bridge rectifier. In the optimally designed MHz WPT system, efficiencies of both the rectification (over 91%) and the overall system (around 80%) are obviously improved compared to the system using the conventional full-bridge rectifier.