A 13.56MHz Wireless Power Transfer System with Hybrid Voltage-/Current-Mode Receiver and Global Digital-PWM Regulation Achieving 150% Transfer Range Extension and 72.3% End-to-End Efficiency

📋 论文概要

本文提出一种13.56MHz无线功率传输系统，采用混合电压/电流模式接收器和全局数字PWM调节，以解决弱耦合和负载变化下电压转换比不足的问题，提高系统鲁棒性。

💡 主要创新点

• 提出混合电压/电流模式接收器，结合两种模式优点，在宽耦合范围内实现高电压转换比和高效率。
• 采用全局数字PWM调节技术，动态优化接收器工作点，增强对耦合和负载变化的鲁棒性。

🏷 关键词

📄 原文摘要

Wireless power transfer (WPT) shows extensive applications in sub-100mW batteryless biomedical implantable devices, where the robustness against variations in coupling and load conditions is still an unsolved and crucial challenge. Typically, a voltage-mode (VM) full-bridge rectifier (FBR) or voltage doubler (VD) is employed at the receiver (RX) side. Though they achieve remarkable power conversion efficiencies (PCE) with delay compensation techniques [1, 2], their limited voltage conversion ratios (VCR) are unfavorable in weak coupling cases. [3] presents a current-mode (CM) RX to build up AC power before rectification, resulting in a higher VCR and a wider input range; however, it shows a degraded PCE and over-power risks in strong coupling cases. On the other hand, a WPT system necessitates not only voltage but also power regulations to achieve optimal end-to-end (E2E) performance. Many prior efforts focus solely on the regulations

👥 作者与机构

Tianqi Lu, Sijun Du

Delft University of Technology, Delft, The Netherlands