壓電振動能量擷取系統分析與實驗

Abstract

壓電能量儲存系統的架構主要是由振動能量源，全波整流器，轉換電路，以及儲能元件集合而成。本文利用壓電材料將振動能轉換成電能，並接上一全波整流器與buck-boost轉換器，buck-boost轉換器的功能是作為輸出阻抗，設計上必須與壓電振動發電裝置匹配，用此概念將轉換器作為壓電能量輸出與儲能元件之間的介面電路。同時，轉換器的耗能也必須納入考慮，轉換器的耗能會影響到儲能元件的儲存功率，既而影響到整體儲能系統的效率。本文是在懸臂樑的第一共振模態下，研究壓電振動發電裝置的儲能系統，並針對轉換器的效率進行討論。實驗結果顯示，此方法在不同的共振模態下，有好的儲能效果。

This research is aimed to study on the energy harvesting from a vibration system. Energy harvester consists of a piezoelectric material and a buck-boost converter and a energy storage device. Energy harvest from ambient vibration has been a popular issue over past few years. Some researchers have great breakthrough to enhance the efficiency of the device. In this research, buck-boost converter is used as an adaptive circuit to adjust the voltage of piezo-generator. In addition, power loss from buck-boost converter and impedance matching between piezoelectric generator and buck-boost converter is considered. .The experiment results show that the efficiency of the energy harvester on the beam is obviously promoted by adjusting the duty cycle, capacitor and frequency of the system to increased harvested power.