具低電壓自我啟動之2.4GHz射頻能量擷取電路

淡江大學機構典藏 > 工學院 > 電機工程學系暨研究所 > 學位論文 > Item 987654321/114787

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Title:	具低電壓自我啟動之2.4GHz射頻能量擷取電路
Other Titles:	Design of a 2.4GHz RF harvesting with low-voltage self-start-up DC-DC boost converter
Authors:	林胤丞;Lin, Yin-Cheng
Contributors:	淡江大學電機工程學系碩士班楊維斌;Yang, Wei-Bin
Keywords:	DC-DC boost converter;Energy harvesting;RF;Self-Start up;自我啟動;低電壓;直流-直流升壓轉換器;射頻;能量擷取
Date:	2017
Issue Date:	2018-08-03 15:04:03 (UTC+8)
Abstract:	近年來，能量收集技術已被廣泛的討論，能源議題在全球受到了重視，許多研究不斷的朝向降低能耗，及開發綠色能源的方向努力，包含振動、熱電、光能和射頻能量轉換等方式。然而，環境中的射頻能量在現代社會中不僅容易獲得，且經由人為的操作具有相對穩定等優點。不管是工業、醫學，以及學界中，許多關於射頻能量收集之技術的應用也一一被提出，包括物聯網、環境變化監控、無線傳感器節點等…應用。藉由無線電源的轉換與管理，不僅能延長電池壽命，免於經常性的更換電池，更可以有效的回收能量，甚至以無電池之方式節省電子產品之面積，使電子產品的整體結構更緊密。本論文將針對各種環境能量來源特性與電源管理系統進行分析並設計一具低電壓自我啟動之2.4兆赫茲射頻能量擷取電路，以低電壓自我啟動以及高轉換效率為目標，並利用UMC 0.18um 1P6M製程實現，電路主要由4區塊所構成，分別為射頻整流器、自我啟動電路、直流-直流升壓電路及脈波頻率控制迴路所組成，為了實現能夠在低電壓自我啟動並且進一步達到穩壓之效果，此電路將升壓操作情形分成2階段，分別為啟動階段與控制迴路調節階段，首先啟動階段先將擷取之射頻能量經過整流器轉換成一直流電壓，並透過電壓偵測器判斷輸入電壓是否足夠啟動並進行第一階段升壓操作；當第一階段所產生的輸出電壓足夠時，將會由零電流偵測電路鎖定功率電晶體之開關，並且開啟控制迴路，經由控制迴路所產生之訊號會操作功率電晶體進行第二階段的升壓動作，並且調節其輸出電壓維持於1.8V。另外全系統模擬加入快速升壓機制，大幅降低控制迴路切換所需的時間，以降低環境能源變異可能對電路操作帶來的影響。全系統在模擬環境TT、FF、SS及攝氏0至75度溫度變異下可穩壓於1.8V，其中可接收最低0dBm之射頻能量並從最低0.3V升壓至1.8V提供最大250uA之電流，整體轉換效率為45%，升壓轉換器最高轉換效率為83%。 Energy issues received attention in the world and energy harvesting technology has been widely discussed in recent years. Many studies have to focus on reducing energy consumption and developing green energy. These green energy including vibration, thermal, light and radiofrequency (RF) energy. However, the ambient RF energy in modern society is not only readily available, and has the advantages of relatively stable through artificial operation. Regardless of industry, medicine, and academia, many applications of the technology on RF energy harvesting is also presented, including Internet of Things, environmental monitoring, wireless sensor nodes. In this paper will analyze a variety of environmental energy source characteristics and power management system to design an energy harvesting circuit and we will improve low voltage self-starting and high conversion efficiency. The proposed harvesting circuit is based on UMC 0.18um 1P6M CMOS process. The circuit will be the operation in two step to conversion voltage. At the first step, the self-start up circuit will detection and boost low input voltage to drive the main boost converter. When the main boost converter have enough voltage to drive the control circuit. It will into the second step. At the second step, the Pulse Frequency Modulation (PFM) control will regulator the boost converter to 1.8V, and locked the inductor current in Discontinuous Conduction Mode (DCM) operation with Zero Current Detect (ZCD) to keep it conversion efficiency. Furthermore, we propose fast-boost mechanism with Clock Voltage Doubler. The simulation result is reduced the first step from 15ms to 3.5ms. The proposed harvesting circuit can receive the lowest 0dBm of RF energy and from the lowest 0.3V boost to 1.8V to provide maximum 250uA current, the overall conversion efficiency of 45%, boost converter maximum conversion efficiency of 83%.
Appears in Collections:	[電機工程學系暨研究所] 學位論文

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