JSSC 2021第6期RF & Wireless65nmEnergy Harvesting

14 A Self-Gating RF Energy Harvester for Wireless Power Transfer With High-PAPR

提出一种自门控射频能量收集器，用于高PAPR波形下的高效无线能量传输

灵敏度-26.7dBm，峰值效率32.3%@-14.1dBm

射频能量收集无线功率传输自门控高PAPR交叉耦合整流器

▸创新点1：自门控功率开关设计（电路创新）。通过在交叉耦合整流器和负载之间引入功率开关，有效切断短功率脉冲之间的反向漏电流，显著提高了能量收集效率。

▸创新点2：动态负载电压比较控制（方法创新）。通过比较负载电压与复制整流器的开路电压，动态控制功率开关的开启和关闭，确保仅在有效功率脉冲期间导通，优化了能量收集过程。

▸创新点3：带可选迟滞的比较器补偿逻辑延迟（电路创新）。提出了一种带有可选迟滞的比较器，补偿了在短功率脉冲开始和结束时的逻辑延迟，确保了功率开关的精确控制，提高了系统的响应速度和稳定性。

▸创新点4：寄生感知的π匹配网络设计（系统创新）。通过考虑寄生效应，优化了π匹配网络的设计，提高了系统的整体性能，特别是在低入射功率下的能量收集效率。

Abstract

In this article, we propose a self-gating radio fre- quency (RF) energy harvester (RFEH) for reaching a high-power harvesting efﬁciency (PHE) at a low incident RF power level with a high peak-to-average power ratio (high-PAPR) waveform. It includes a power switch between a cross-coupled rectiﬁer and its supplied load to cut off the reverse leakage current in between the short power bursts. The power switch is dynamically controlled based on an indication of the ability of the RFEH to effectively