改良式同步電荷提取電路應用於磁激振力作用下之壓電能量擷取研究

Abstract

本論文是探討壓電振動能量擷取的介面電路應用於轉動式磁激振力模型下的研究，透過改良傳統的同步電荷提取電路，調整成可適用在轉動式磁激振力的壓電獵能器上。此獵能器是由一根壓電懸臂樑，藉著非接觸式的磁力激振壓電懸臂樑發生壓電效應，而將力學能轉換成電能，接著在後端接上改良式同步電荷提取電路。本論文的研究成果改良了本研究團隊先前的電路架構，使電路所能承受的壓電懸臂樑兩端跨壓突破20V的限制，藉此也提升了本團隊可以從轉動式磁激振力的模型下擷取到的能量。在本研究論文的最後以實驗的方式驗證同步電荷提取電路在轉動式磁激振力模型下的理論輸出能量以及電路的特性，並與標準直流轉換電路做比較。除了在不同介面電路架構之下的能量擷取大小比較之外，本論文也透過實驗的結果顯示出同步電荷提取電路有著可以拓展能量輸出頻寬的特性。

The thesis develops an improved SECE (synchronized electric charge extraction) interface circuit suitable for extracting energy from a rotary magnetic plucking dynamic system. Indeed, the device consists of a piezoelectric cantilever beam fixed on a stationary base and attached to an SECE circuit. A tip magnet is excited by a rotating magnet, giving rise to harvesting energy by non-contact magnetic plucking. The proposed improved SECE circuit allows the piezoelectric voltage exceeding 20 Volt, and therefore, harvested energy is enhanced in comparison with our previous result. Finally, the experimental results are found in good agreement with the theoretical predictions, confirming the superiority of the improved SECE circuit over the standard interface circuit. In addition, another advantage using the SECE technique is the enlargement of bandwidth in the rotary frequency response.