应用于双频段射频能量获取倍压整流器的设计

发布时间：2018-06-17 01:12

本文选题：无电池电源系统 + 射频能量获取　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：本文基于微功耗无线传感网络节点中对无电池电源系统的要求,设计了一个可获取环境中低能量密度的射频能量,并将其转化为直流电压的双频段射频整流器。主要能够获取环境中广泛存在的915MHz及2.4GHz射频能量,并根据环境中实际射频信号的能量密度,分别设计了适用于不同频段的整流器结构。由于环境中射频能量密度较低,整流器的功率转换效率以及升压倍数直接决定了后级电路能否正常工作以及其工作范围,因此本文也从各个方面对整流器的性能进行了改进。另外,考虑到实际应用中射频整流器与天线的匹配问题,本文对于射频整流器的天线进行了详细的讨论和研究。由于整流器的匹配网络不仅涉及到天线接收到的能量能否最大限度得传输给整流器,而且还可实现一定的升压效果,提高了整流器的转换效率。而匹配网络的设计又需考虑整流器本身的输入阻抗,从而决定了匹配网络的升压倍数,进而影响了整流器的转换效率,因此,本文将整流器与匹配网络相结合进行优化得出的性能更具有实际意义。本电路基于TSMC65nm工艺,采用Cadence Spectre软件进行仿真,得到对于915MHz射频能量可以在负载loadR?4M?时,-22.4dBm的输入能量密度下,整流器的功率转换效率(PCE)可达12.1%,且输出电压达到1.67V。在低至-23.15dBm的输入能量密度下,负载loadR?4M?时,输出电压也能达到1.13V,符合后级DC/DC电路的工作条件。而对于2.4GHz射频能量,在-15.19dBm的输入能量密度下的最高功率转换效率可达31.7%。在-21.37dBm的输入能量密度下,负载loadR?5M?时,功率转换效率为3.33%,输出电压可升至1.1V,符合后级电路的工作要求。
[Abstract]:Based on the requirement of battery free power supply system in wireless sensor network nodes with low power dissipation, a dual-band radio frequency rectifier with low energy density in the environment is designed and converted to DC voltage. It can obtain 915MHz and 2.4GHz RF energy widely existing in the environment. According to the energy density of the actual RF signal in the environment, the rectifier structures suitable for different frequency bands are designed respectively. Because of the low RF energy density in the environment, the power conversion efficiency and the boost ratio of the rectifier directly determine whether the backstage circuit can work normally and its working range. Therefore, the performance of the rectifier is improved from various aspects. In addition, considering the matching problem between RF rectifier and antenna in practical application, the antenna of RF rectifier is discussed and studied in detail in this paper. The matching network of rectifier not only relates to whether the energy received by antenna can be transmitted to the rectifier to the maximum extent, but also can achieve certain boost effect and improve the conversion efficiency of rectifier. The design of matching network needs to consider the input impedance of the rectifier itself, which determines the boost of the matching network and thus affects the conversion efficiency of the rectifier. It is of practical significance to optimize the performance of rectifier and matching network in this paper. This circuit is based on TSMC 65nm process and is simulated by Cadence Spectre software. At the input energy density of 22. 4 dBm, the power conversion efficiency and output voltage of the rectifier can reach 12. 1 and 1. 67 V respectively. At a low input energy density of -23.15dBm, the load is 4m? The output voltage can also reach 1.13 V, which conforms to the working conditions of the DC / DC circuit. For 2.4 GHz RF energy, the maximum power conversion efficiency at -15.19 dBm input energy density can reach 31.775. Under the input energy density of -21.37 dBm, the load is 5m? The power conversion efficiency is 3.33 and the output voltage can reach 1.1 V, which meets the requirements of the latter stage circuit.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461

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