A 27W D2D Wireless Power Transfer System with Compact Single-Stage Regulated Class-E Architecture and Adaptive ZVS Control

📋 论文概要

本文针对设备到设备（D2D）无线快速充电需求，提出了一种27W输出功率的双向无线功率传输（WPT）系统。采用紧凑的单级调节Class-E功率放大器架构，并引入自适应零电压开关（ZVS）控制，在提升输出功率的同时实现高效率和紧凑设计。

💡 主要创新点

• 采用单级调节Class-E架构，相比传统Class-D方案在相同输入电压下获得更高输出功率（27W），且无需额外分立元件进行阻抗匹配。
• 提出自适应ZVS控制技术，动态调整开关时序以维持零电压开关条件，提高系统效率并降低电磁干扰。

🏷 关键词

📄 原文摘要

University of Macau, Macau, China 1 2 Compact and high-power bidirectional wireless power transfer (WPT) systems are desirable for mobile device-to-device (D2D) wireless fast charging. Prior WPT solutions [1-3] with integrated Class-D power amplifier (PA) provide relatively low output power (<10W). A Class-E PA has higher output power capability than a Class-D PA with the same input voltage. The 70W single-ended Class-E PA in [4] uses one additional bulky discrete MOSFET working as a tunable capacitor for impedance matching, achieving zero-voltage-switching (ZVS) and zero-voltage-derivative-switching (ZVDS) with 50% switching duty cycle across wide load and distance ranges. The 100W differential ClassE PA in [5] provides higher output power but requires a discrete impedance tuning network with 2 CBLOCK’s, 3 RDC’s, and 2 MOSFETs. These two solutions are well suited for pad-to-device wireless charging, but are hard to be embedded in a mobile phone. In

👥 作者与机构

Xiaofei Ma1,2, Yan Lu2, Wing-Hung Ki1

Hong Kong University of Science and Technology, Hong Kong, China