Numerical analysis of piezoelectric energy harvesting system 蕭文裕、羅正忠
E-mail: 324912@mail.dyu.edu.tw
ABSTRACT
A piezoelectric harvester can harvest energy from around a few micro-Watt (μ W) to a few milliwatts (mW); in fact, it’s really small. But why does it still attract many well-known research teams to set it as the key research area? That's because its mechanism is simple and its area is tiny (can less than 1cm 2 ), and in the process of micro-, it can be used with standard semiconductor
manufacturing process and the integration of integrated circuits, which are suitable for the demand of many other fields, such as:
wireless, telemetry, wireless multipoint distribution monitoring networks and MEMS, and so on. Because the energy that piezoelectric harvester can harvest is really very small, it is difficult to directly supply all kinds of electronic facilities with it.
Therefore, power must be consolidated and stored, and then be exported to supply an external facilities. This objective is twofold: 1.
The selection of the best adhesive location of piezoelectric patches in order to get the most out of converting energy. 2. Energy harvesting circuit analysis, to achieve the best conversion efficiency. This Matlab simulation tries to find how the beams under various boundary conditions vibrate, so that we can identify piezoelectric film adhesive law---adhesive in vibration response at the maximum, you can get the best conversion energy. And the interface circuit input impedance is the key to maximize energy
conversion, that is, the circuit input impedance must match with the impedance of piezoelectric equivalent output in order to get the highest conversion efficiency.
Keywords : MFC piezoelectric actuator, piezoelectric harvester, impedance matching, the vibration mode.
Table of Contents
中文摘要...iii ABSTRACT...iv 誌 謝...v 目錄...vii 圖目 錄...x 表目錄...xii 符號 表...xiii 第一章 緒論 1.1 研究背景...1 1.2 壓電材料與壓電效應...2 1.2.1 壓電材料的種類...2 1.2.2 壓電效
應...3 1.3 壓電致動器...6 1.3.1 單片壓電陶瓷（PZT）致動 器...6 1.3.2 單片狀壓電陶瓷加指叉式電極...6 1.3.3 主動式壓電纖維複合致動器...8 1.3.4 條 狀壓電纖維複合致動器...8 1.4 壓電致動器的機電模型...12 1.5 文獻回
顧...14 - viii - 1.5.1 擷能器能量轉換效率之研究...14 1.5.2 擷能器電能的儲存與 電路之研究...15 1.5.3 擷能器所產生電能應用之研究...16 1.5.4 正在快速發展中之擷能器...16 1.6 研究目的與方法...17 第二章 壓電能擷取系統 2.1 壓電能量擷取系統...19 2.2 壓電能量擷取系統模型...20 2.3 壓電能量擷取電路...21 2.4 壓電能量擷取器 應用現況...22 第三章 樑的結構動態分析與應變 3.1 四種不同邊界情況的樑振動分析...27 3.1.1 簡支樑...29 3.1.2 固定-簡支樑...30 3.1.3 固定
樑...31 3.1.4 懸臂樑...31 3.2 樑的潛在振動能擷取與轉換之關 鍵因素...36 第四章 壓電能量阻抗模型與能量分析 4.1 共軛複數阻抗匹配...37 4.2 不完全匹配與 完全匹配...37 4.3懸臂樑+MFC壓電元件的阻抗匹配分析...40 4.4 機電轉換因子對阻抗匹配能量轉 換影響之分 析...43 4.5 MFC 壓電元件原始電容對阻抗匹配能量轉換影 - ix - 響之分 析...44 第五章 結論與未來工作 5.1 結論...46 5.2 未 來工作...47 參考文獻...48
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