A 6.78MHz 94.2% Peak Efficiency Class-E Transmitter with Adaptive Real-Part Impedance Matching and Imaginary-Part Phase Compensation Achieving a 33W Wireless-Power-Transfer System

📋 论文概要

本文提出了一种6.78MHz的Class-E发射机，通过自适应实部阻抗匹配和虚部相位调整，在宽负载阻抗范围内实现了94.2%的峰值效率。解决了无线功率传输系统中负载变化导致效率下降的问题。

💡 主要创新点

• 提出自适应实部阻抗匹配技术，动态调整发射机输出阻抗以匹配变化的负载实部。
• 引入虚部相位调整机制，补偿负载变化引起的电抗分量，保持Class-E的零电压开关条件。

🏷 关键词

📄 原文摘要

convenience. However, high efficiency is usually achieved at a specific load point in current wireless power transfer (WPT) systems rather than in a wide impedance range. The load varies greatly when charging state changes as shown in Fig. 9.7.1. And this variation will cause both real and imaginary parts of the transmitter’s (TX) load impedance to vary over a wider range reflected from the coil coupling. To overcome this drawback, some TX designs [1–5] utilize a Class-D architecture due to its ease of control. Nevertheless, Class-E power amplifiers have garnered interest benefit by their reduced switching losses with zero-voltage-switching (ZVS), zero-voltage-derivative-switching (ZVDS) as well as smaller number of switches, which presents a higher potential for efficiency, especially at high

👥 作者与机构

Yuhao Xiong, Wenxing Cao, Xihao Liu, Shangzhou Zhao, Zhongming Xue,

Zhuoqi Guo, Li Geng Xi’an JiaoTong University, Xi’an, China Wireless charging of portable devices has received explosive growth due to its