A Wireless Power Transfer System with Up-to-27.9% Efficiency Improvement under Coupling Coefficient Ranging from 0.1 to 0.39 Based on Phase-Shift/Time-Constant Detection and Hybrid Transmission Power Control

📋 论文概要

该论文提出了一种无线功率传输系统，通过优化接收端的可重构整流器控制策略，在耦合系数从0.1到0.3的宽范围内实现了高达27.9%的效率提升。解决了传统固定功率传输时轻载条件下效率严重下降的问题。

💡 主要创新点

• 提出了一种基于负载感知的自适应模式切换技术，根据接收端负载条件动态调整整流器的工作模式，减少0X模式的占比，从而提升轻载效率。
• 设计了高效的发射端功率动态调节机制，与接收端模式协同工作，实现宽耦合系数范围下的端到端效率优化。
• 采用紧凑的接收端架构，无需额外功率变换器，仅通过谐振调节整流器即实现稳压和高效传输。

🏷 关键词

📄 原文摘要

Wireless power transfer (WPT) is a convenient way to power the wearable/portable devices with water/dusty-proof requirement. The end-to-end (E2E) efficiency ηE2E is a key specification of WPT system. A compact and efficient solution for WPT receiver (RX) is using the reconfigurable resonant-regulated (R3) rectifier, which regulating the output through configuring the rectifier between charging (1X) and discharging (0X) modes [1]. Under light-load conditions, the 0X mode occupies most of time at RX, reducing the ηE2E seriously if the transmission power of transmitter (TX) is fixed. To obtain the mode information of RX for adaptive transmission power control thus improving ηE2E, various techniques with load-shift-keying (LSK) detection have been proposed [2–6]. A popular method is amplitude detection [2–5], where the amplitude of TX-tank current iTX is detected firstly, and then be compared with a threshold voltage VTH

👥 作者与机构

Yutang Chen, Yuxuan Luo, Yifan Lin, Lei Shao, Dihu Chen, Jianping Guo

Sun Yat-Sen University, Guangzhou, China