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  本文選題：無電池電源系統(tǒng) + 射頻能量獲取��； 參考：《西安電子科技大學》2014年碩士論文

【摘要】：本文基于微功耗無線傳感網絡節(jié)點中對無電池電源系統(tǒng)的要求,設計了一個可獲取環(huán)境中低能量密度的射頻能量,并將其轉化為直流電壓的雙頻段射頻整流器。主要能夠獲取環(huán)境中廣泛存在的915MHz及2.4GHz射頻能量,并根據環(huán)境中實際射頻信號的能量密度,分別設計了適用于不同頻段的整流器結構。由于環(huán)境中射頻能量密度較低,整流器的功率轉換效率以及升壓倍數直接決定了后級電路能否正常工作以及其工作范圍,因此本文也從各個方面對整流器的性能進行了改進。另外,考慮到實際應用中射頻整流器與天線的匹配問題,本文對于射頻整流器的天線進行了詳細的討論和研究。由于整流器的匹配網絡不僅涉及到天線接收到的能量能否最大限度得傳輸給整流器,而且還可實現(xiàn)一定的升壓效果,提高了整流器的轉換效率。而匹配網絡的設計又需考慮整流器本身的輸入阻抗,從而決定了匹配網絡的升壓倍數,進而影響了整流器的轉換效率,因此,本文將整流器與匹配網絡相結合進行優(yōu)化得出的性能更具有實際意義。本電路基于TSMC65nm工藝,采用Cadence Spectre軟件進行仿真,得到對于915MHz射頻能量可以在負載loadR?4M?時,-22.4dBm的輸入能量密度下,整流器的功率轉換效率(PCE)可達12.1%,且輸出電壓達到1.67V。在低至-23.15dBm的輸入能量密度下,負載loadR?4M?時,輸出電壓也能達到1.13V,符合后級DC/DC電路的工作條件。而對于2.4GHz射頻能量,在-15.19dBm的輸入能量密度下的最高功率轉換效率可達31.7%。在-21.37dBm的輸入能量密度下,負載loadR?5M?時,功率轉換效率為3.33%,輸出電壓可升至1.1V,符合后級電路的工作要求。
[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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM461

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本文編號：2028917