一种高效环境WiFi能量收集系统  

An Efficient Ambient WiFi Energy Harvesting System

作　　者：徐涛 於正超 XU Tao;YU Zhengchao(School of Automation, Shenyang Aerospace University, Shenyang 110136, China)

机构地区：[1]沈阳航空航天大学自动化学院,辽宁沈阳110136

出　　处：《无线电工程》2018年第6期492-496,共5页Radio Engineering

基　　金：沈阳市科学计划基金资助项目(17-208-9-00)

摘　　要：针对无线传感器系统高效率供电的问题,提出通过射频收集能量并转换为电能的方式将能量提供给无线传感器系统使用的方法。重点研究一款高效的环境WiFi能量收集系统,主要包括天线和整流电路优化设计2大部分。天线由2×2微带天线阵列组成,主要负责捕获环境中2.4 GHz WiFi信号,提高接收天线的灵敏度。整流电路设计基于Greinacher倍压电路,通过改变倍压电路参数或元器件的方式来提高转换效率即可以高效地转换能量。通过调整天线阵列和整流电路的参数,当输入功率在-35^-10 dBm时,能量收集系统的转换效率可以达到最佳状态。在特定的频带进行仿真测试,能量收集系统接收天线距离WiFi路由器2.3 m时,输出整流电压为1 089 mV。实验结果表明,能量收集系统可以有效地从周围的WiFi信号中收集能量。In view of high-efficiency power supply for wireless sensor systems,this paper proposes a method of providing energy tothe wireless sensor system by collecting radio frequency energy and converting it into electrical energy. In this paper,an efficient ambient WiFi energy harvesting system is studied detailedly,and this system mainly includes such two parts as the antenna and the rectifier circuit. The antenna is composed of 2×2 microstrip antenna array that is responsible for capturing 2.4 GHz WiFi signals and increasing the sensitivity of the receiving antenna. The rectifier circuit is designed based on Greinacher voltage doubler circuit,which changes the voltage doubling circuit parameters or components to improve the conversion efficiency that can efficiently convert energy. By adjusting the parameters of the antenna array and the rectifier circuit,the conversion efficiency is optimized while the ambient WiFi energy power is between -35 dBm and -10 dBm. The simulation and the test results are compared in specified frequency band. The output rectified voltage of energy harvesting system is 1 089 mV while the distance between the receiving antenna of energy harvesting system and WiFi router is 2.3 m. The experiment results show that the energy harvesting system can effectively collect energy from ambient WiFi signals.

关 键 词：能量收集 天线阵列 微带天线 整流电路 

分 类 号：TN85[电子电信—信息与通信工程]