同步電荷提取自動電路設計及其在轉動式壓電振能擷取之應用

Abstract

本論文旨在探討同步電荷提取開關的自動切換電路設計，因為過往團隊以外加控制訊號來決定電路開關開啟的時機，然而該方法若應用於陣列架構，會有因必須同時監控多根振子導致無法精確判斷開關開啟時機。故藉由自動切換電路的運行，除可改善外加控制訊號操作困難等問題，並可延伸至非單一弦波週期性振盪狀態的旋轉式磁激振模型實驗，來進行同步電荷提取能量擷取之研究。根據設計，該自動切換電路覆蓋本團隊實驗所需的頻率區間。而實驗結果顯示，由同步電荷提取自動切換電路操控的發電功率與理論預測是相符合的。另外該切換電路對於開關開啟的時間誤差，也低於原先以外加控制訊號操控的誤差，證實了所開發的自動切換電路足以取代傳統由外加控制訊號開啟電路開關的操作方式。

The present thesis is focus on the auto circuit design for controlling the synchronized electric charge extraction (SECE) switch. The conventional approach for the SECE switch control is to use the external signal to monitor it. However, such an approach may not be applied to the case of multiple oscillators due to the difficulty in monitoring the electric response of each oscillator. Thus, the circuit development of switch control can not only resolve such a difficulty but also can be extended to the cases of periodic excitations of multiple signals. This includes the case of implementing an SECE interface circuit to extract energy from rotatory magnetic plucking. Our design shows the working frequency of the proposed circuit covers the resonant frequencies of the cantilever bimorphs used in our laboratory. Next, the measured harvested power output based on the proposed controller circuit agrees quite well with the theoretical predictions. In addition, the error for controlling the switching period is less than that based on the external monitoring, confirming the feasibility of the proposed controller circuit.