低功耗节点射频供能方法研究与设计

发布时间：2018-01-26 06:55

本文关键词： 功耗自适应射频能量收集整流器能量转换效率　出处：《北方工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,随着射频能量收集技术和无线射频的信号频率范围的来源越来越广,使得低功耗的无线网络节点的自供电,即利用射频能量收集进行自供电成为可能。这一技术的应用使得依靠电池,以及由于微能量限制,特殊的自然环境下不易更换电池的低功耗无线传感节点的使用得到了较大的改善。本文提出了射频信号的收集系统为低功耗的节点供能,而且分析了射频能量信号收集系统的各个模块,同时对于与不同的方案进行对比分析,将最佳方案整合为射频能量信号收集的设计系统。首先,文章对射频信号收集系统的整体电路结构的基本原理进行了分析,并对现有的微能量收集如太阳能,压电能量,射频能量等进行了比照,并且分析其不同的优缺点。再次,剖析了射频信号获取系统的匹配电路,整流倍压电路,基准稳压电路等组成部分的电路结构和基本原理。最后,针对物联网末端的低功耗节点,在已有的电路基础上进行电路改造创新,并在ADS中进行仿真分析。其中本文的射频信号收集系统核心部分提出一种自适应的射频能量信号的转换电路。利用辅助晶体管动态地控制整流器链的阈值电压,设计的电路降低了晶体管正向偏置的阈值电压,增加了收获的功率和输出电压,同时增加了反向偏置的阈值电压,以减少漏电流,防止电容存储能量的损耗,提高了整流倍压电路的转换效率。本文设计的射频能量信号转换系统中包含T型匹配电路,自适应的倍压整流电路的级数为12级,超低功耗基准稳压电路。并将其在ADS中对于射频能量收集系统进行了模块仿真分析和总体的仿真分析,最终得出整流倍压电路的转换效率在-14dBm时达到35.3%,同时,在能量转换时间经过100ms以后,输出负载为1MΩ的输出电压大约为3.2V,达到了低功耗节点的电压工作范围。
[Abstract]:In recent years, with the increasing sources of RF energy collection technology and RF signal frequency range, low power consumption wireless network nodes self-supply. It is possible to use RF energy collection for self-supply. The application of this technology makes it possible to rely on batteries, and because of the limitation of micro-energy. The use of low power wireless sensor nodes, which are not easy to replace batteries, has been greatly improved in the special environment. In this paper, a radio frequency signal collection system is proposed to provide energy for low power consumption nodes. And analyzed each module of RF energy signal collection system, at the same time, compared with different schemes, integrated the best scheme into the design system of RF energy signal collection. First of all. This paper analyzes the basic principle of the whole circuit structure of the RF signal collection system, and compares the existing micro-energy collection such as solar energy, piezoelectric energy, RF energy and so on. And analyzed its different advantages and disadvantages. Thirdly, analyzed the RF signal acquisition system matching circuit, rectifier voltage doubling circuit, reference voltage regulator circuit and other components of the circuit structure and basic principles. Aiming at the low-power nodes at the end of the Internet of things, the circuit innovation is carried out on the basis of the existing circuits. The core part of the RF signal collection system in this paper presents an adaptive conversion circuit of RF energy signal. The auxiliary transistor is used to dynamically control the threshold electricity of rectifier chain. Press. The designed circuit reduces the threshold voltage of forward bias, increases the gain power and output voltage, and increases the threshold voltage of reverse bias to reduce leakage current and prevent the loss of capacitor storage energy. The conversion efficiency of rectifier voltage doubling circuit is improved. The RF energy signal conversion system designed in this paper includes T matching circuit, and the series of adaptive voltage doubling rectifier circuit is 12. The ultra-low power reference voltage stabilizer circuit is used in ADS. The module simulation analysis and the overall simulation analysis for the RF energy collection system are carried out. Finally, the conversion efficiency of the rectifier voltage doubling circuit reaches 35.3um at -14dBm, and after 100ms after the energy conversion time. The output voltage with output load of 1m 惟 is about 3.2 V, which reaches the voltage range of low power consumption node.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.44;TM619

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