Low-harmonic-distortion and high-efficiency class E2 DC-DC converter for 6.78 MHz WPT

2018 IEEE International Conference on Industrial Electronics for Sustainable Energy Systems (IESES) Pub Date : 1900-01-01 DOI:10.1109/IESES.2018.8349913

Shuangke Liu, Chengbin Ma

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引用次数: 3

Abstract

The Class E2 dc-dc converter, composed by soft-switching based Class E power amplifier (PA) and rectifier, is popular for 6.78 MHz wireless power transfer (WPT) for its high efficiency and simple topology. Here, we take a comprehensive analysis on the harmonic voltages and currents on the transmitting and receiving coils in a Class E2 dc-dc converter. These harmonics can be radiated into the free space through the coils, causing low system efficiency and electromagnetic interference (EMI) issues. And thus, it is expected to eliminate these harmonics. Next, an improved Class E2 dc-dc converter with low harmonic distortion and high efficiency is proposed. The harmonic distortions on both receiving and transmitting coils are greatly reduced by the employment of the full-wave Class E rectifier and Pi impedance transformation network. The total harmonic distortion (THD) of voltages and currents are less than 57.5% of those of the classical system. In addition to the reduction of harmonic distortion, the proposed converter is able to maintain high efficiencies, over 70%, when the coil coupling changes, by carefully designing the Pi network.

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用于6.78 MHz WPT的低谐波失真和高效率E2级DC-DC变换器

E2级dc-dc变换器由基于软开关的E级功率放大器(PA)和整流器组成，以其高效率和简单的拓扑结构在6.78 MHz无线功率传输(WPT)中广受欢迎。在这里，我们对E2类dc-dc变换器中发射线圈和接收线圈上的谐波电压和电流进行了全面分析。这些谐波可以通过线圈辐射到自由空间，导致低系统效率和电磁干扰(EMI)问题。因此，它有望消除这些谐波。其次，提出了一种改进的低谐波失真、高效率的E2类dc-dc变换器。采用全波E类整流器和Pi阻抗变换网络，大大降低了接收线圈和发射线圈上的谐波畸变。电压和电流的总谐波失真(THD)小于经典系统的57.5%。除了减少谐波失真外，通过精心设计Pi网络，当线圈耦合变化时，所提出的转换器能够保持超过70%的高效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 IEEE International Conference on Industrial Electronics for Sustainable Energy Systems (IESES)

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