臺灣博碩士論文加值系統

超音波技術已廣泛運用在工業加工、民生及醫療等方面，超音波震盪子(Ultrasonic Transducer)的外型種類繁多，常見有錐體喇叭形狀的超音波震盪子，應用於超音波清洗、霧化等方面。雖然已有許多相關文獻研究超音波震盪子驅動器，但對於實際在驅動震盪子時，震盪子振動效果的好壞、電能轉換成機械能的效率、電路和震盪子的溫升問題等，皆較少討論。因此，本論文旨在基於實務考量下，在設計驅動超音波震盪子的同時，探討在不同的測試條件下，震盪子的振動效果及轉換效率等情形。
本文採用半橋換流器結合LC 串聯諧振並聯負載(Series Resonant Parallel Loaded,SRPL)之電路作為驅動器的主要架構，提供弦波電壓、電流給震盪子，使其穩定振動。在此架構中，探討震盪子的諧振頻率、驅動器的操作頻率、震盪子電壓、振動量及轉換效率之間的關係，並整理出SRPL 電路中諧振電感與諧振電容的設計方法。依據本文所提出的設計方法流程，套用在不同特性的震盪子上，同時以不同的輸入電壓進行設計，找出合適的諧振電感與諧振電容值。最後，製作出具自動掃頻功能的超音波震盪子驅動器，並與市售的驅動器進行測試比較，驗證出此設計方法的可行性。

Ultrasonic technology has been widely used in industrial processing, daily life, and medical fields. Ultrasonic transducers come in various shapes, with the conical horn-shaped transducer being common for applications such as ultrasonic cleaning and atomization. Although many studies have focused on ultrasonic transducer drivers, there has been less discussion on the actual performance of transducers when driven, including the quality of transducer vibration, the efficiency of converting electrical energy into mechanical energy, and issues related to the temperature rise in the circuit and transducer. Therefore, this thesis aims to design an ultrasonic transducers driver circuit from practical perspective. To explore the vibration and conversion efficiency under different test conditions. The main structure of the driver circuit in this study is a half-bridge inverter combined with an LC series resonant parallel loaded (SRPL) circuit, which provides a stable sine wave voltage and current to the transducer. This research investigates the relationships among the resonant frequency of the transducer, the operating frequency of the driver, the voltage applied to the transducer, the vibration amplitude, and the conversion efficiency. It also formulates a design method for the resonant inductance and resonant capacitance in the SRPL circuit. By applying the proposed design methodology to transducers with different characteristics and under varying input voltages, appropriate values for the resonant inductance and capacitance are determined.
Finally, an ultrasonic transducer driver with an automatic frequency scanning function is developed. Comparative tests with commercially available drivers demonstrate the feasibility of this design method.

摘要......i
Abstract......ii
誌謝......iv
目錄......v
表目錄......vii
圖目錄......viii
第一章緒論......1
1.1 研究目的與動機......1
1.2 文獻回顧......2
1.3 論文架構......5
第二章超音波震盪子特性介紹......6
2.1 超音波震盪子介紹......6
2.2 壓電陶瓷元件介紹......7
2.2.1壓電材料之特性......7
2.2.2 壓電材料性質參數......8
2.2.3 壓電陶瓷等效電路模型......9
2.2.4 超音波震盪子等效元件量測......11
2.3 超音波震盪子的振動特性......13
第三章驅動系統之匹配電路設計......18
3.1 匹配電路分析與推導......19
3.2 Matlab 演算......22
3.2.1 PSIM輔助驗證......25
3.2.2 測試環境......28
3.2.3 驗證測試......30
3.2.4 電壓增益修正測試......34
3.2.5 不同輸入電壓之設計及測試......40
3.3 測試結果討論......45
3.4 匹配電路設計流程圖......47
第四章驅動系統硬體架構及軟體規劃......49
4.1 硬體架構......50
4.1.1 半橋換流器......50
4.1.2 輔助電源......51
4.1.3 頻率控制電路......52
4.2 軟體規劃......53
4.2.1 主程式規劃......53
4.2.2 掃頻副程式規劃......54
第五章實驗結果與討論......55
5.1 實驗樣品特性......56
5.2 超音波震盪子B 設計......58
5.2.1 輸入電壓150V 系統設計......58
5.2.2 輸入電壓48V 系統設計......63
5.3 超音波震盪子C 設計......66
5.3.1 輸入電壓150V 系統設計......66
5.3.2 輸入電壓48V 系統設計......70
5.4 自動掃頻驗證......72
5.5 市售驅動器比較......73
第六章結論與未來方向......77
6.1 結論......77
6.2 未來研究方向......77
參考文獻......78
Extended Abstract......82
1. Introduction......83
2. Piezoelectric Characteristic......83
3. Design and Configuration......84
4. Experimental Results......85

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