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標題: | 適用於壓電能量擷取系統的同步切換介面電路與全電容式脈衝頻率調變直流降壓轉換器 Self-powered synchronized switching techniques and pulse frequency modulation switched-cap DC-DC converter for piezoelectric energy harvesting system |
作者: | Weian Chen 陳韋安 |
指導教授: | 陳信樹(Hsin-Shu Chen) |
關鍵字: | 壓電能量擷取,同步切換介面電路,直流降壓轉換器, Piezoelectric energy harvesting,Switched Capacitor,DC-DC Converter,Pulse Frequency Modulation,self-powered Synchronized Switching Harvesting on an Inductor, |
出版年 : | 2019 |
學位: | 碩士 |
摘要: | 本論文研究期望經由壓電元件將振動能轉換為電能,經過整流介面電路AC-DC Converter將電能儲存一小段時間後,再經由一個DC-DC Converter將所儲存的電能提供給無線藍芽溫度感測器。本論文包含整流介面電路AC-DC Converter 及DC-DC Converter兩部份。
壓電能量擷取系統輸出並非理想電源,擁有內部阻抗與寄生電容,導致壓電元件輸出效率不佳,可以採用同步切換技術(Synchronized switching techniques) 來提升壓電元件轉換效率。傳統的同步切換技術需要額外的控制訊號即能量去切換開關。 本論文第一部分使用的是一種Self-powered的Synchronized Switching Harvesting on an Inductor(SSHI)介面電路,MOS跟電容所實現的峰值檢知器與比較器產生控制訊號來達到自動切換開關而不需要額外的控制能量。本晶片電路在使用電流振幅為30 μA、頻率120 Hz、寄生電容為6.7 nF之壓電元件做為輸入時,根據使用T25HVG2的製程,設計出的整流晶片量測結果,輸出功率可達21.3 μW。與標準界面電路相比,本整流晶片提供161 %的輸出功率增益。 第二部分則是提出一個全電容式的直流電壓轉換器(Switched-cap DC-DC Converter),除了可以得到無使用電感的好處之外,使用discrete-time pulse frequency modulation (PFM)控制,達到低控制功耗與高輕載效率的目標,根據使用T25HVG2的製程,設計出的晶片量測結果,此轉換器在輸入電壓為5 V時的最高效率為62.8 %,而輕載(負載電流10μA)時的效率大於53 %,輸出電壓在1.3V至1.33V之間。 In this thesis, we expect vibration energy can transfer to electronic energy by piezoelectric device, harvesters can be installed around vibration sources to harvest energy from ambient vibrations, The output from a piezoelectric energy harvester is in alternating current (AC) form, and needs to be transformed into direct current (DC) form to supply electronic devices by an interface circuit. After interface circuit usually consists of a DC/DC converter to supply the blue-tooth wireless sensor. This thesis consists of AC-DC interface circuit and DC-DC converter. The output from a piezoelectric energy harvester is non-ideal it cause power -loss, so we can use Synchronized switching techniques to improve output-power, conventional Synchronized switching techniques need another power to control switch signal. This thesis fist presents self-powered的Synchronized Switching Harvesting on an Inductor(SSHI)interface circuit. The control signal is auto generated by MOS switch, peak detector and the comparator without external power.t According to measurement results, this chip has maximum output power of 21.3 μW when operating with a piezoelectric harvester with current amplitude 30 μA, operating frequency 120 Hz and internal static capacitance 6.7 nF. Compared to the standard interface circuit, this chip provides 161% output power (use T25HVG2 process) This thesis presents switched-cap DC/DC convertor adopts discrete-time pulse frequency modulation (PFM) control to achieve the design goals of low control power a without inductor. According to the measurement results, this chip has a peak efficiency of 62.8 % with 5 V input voltage and lock on 1.3V-1.33 voltage。 |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73942 |
DOI: | 10.6342/NTU201903635 |
全文授權: | 有償授權 |
顯示於系所單位: | 電子工程學研究所 |
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