低功率场射频能量收集电路的仿真与验证

Simulation and verification of RF energy collection circuit in low power field

该文设计了一种低功率场射频能量收集电路,可收集中心频率为915 MHz的射频信号,并提供对外直流电源输出。该电路由阻抗匹配电路、倍压整流电路和电能存储电路组成。该文基于ADS仿真软件对电路进行设计,并对其性能进行检验,搭建了硬件电路进行实验验证。实验结果表明,当输入射频功率大于-5 dBm,整流倍压电路的负载电阻为10 kΩ时,输出电压高于0.8 V,空载时输出电压高于4.39 V;当输入功率为10 dBm,整流倍压电路的负载电阻为10 kΩ时,输出电压高达3.6 V,空载时输出电压高达7.7 V。为提高倍压整流电路输出电压,设计了谐振电路对倍压整流电路进行改进优化,并对其进行仿真实验验证。仿真实验结果表明,加入谐振回路的倍压整流电路的输出电压是传统倍压整流电路输出电压的2.5倍。该射频整流电路可用于无线传感器等低功耗电子设备的电能无线供应。

In this paper,a RF energy collection circuit in low power field is designed,which can collect RF energy at 915 MHz center frequency and provide external DC power output. The circuit consists of impedance matching circuit,voltage doubling rectifier circuit and electric energy storage circuit. The performance of rectifier circuit is designed and tested by ADS simulation software,and the hardware circuit is built for experimental verification. The experimental results show that when the input RF power is greater than-5 dBm and the load resistance of the rectifier voltage doubling circuit is 10 kΩ,the output voltage is higher than 0.8 V and the output voltage is higher than 4.39 V under no-load;When the input power is 10 dBm and the load resistance is 10 kΩ,the output voltage is up to 3.6 V and the no-load output voltage is up to 7.7 V. In order to improve the output voltage of voltage doubling rectifier circuit,a resonant circuit is designed to improve and optimize the voltage doubling circuit,and its simulation experiment is carried out to verify it. The simulation results show that the output voltage is 2.5 times that of the traditional voltage doubling rectifier circuit. The RF rectifier circuit could be used for wireless power supply of low-power electronic devices such as wireless sensors.