臺灣博碩士論文加值系統

本論文將設計的鎖相迴路鎖頻演算法應用於超音波噴塗系統，為因應不同超音波換能器，在此所允許的驅動頻率為20至80千赫。換能器在共振與反共振點，電壓電流的相位差為零，利用數位鎖相迴路技術能保持與輸入訊號頻率及輸入相位一致的特性，來自動鎖頻。希望所規劃的演算法，可自動使超音波換能器驅動於共振頻率或反共振頻率，並抑制其它頻率的諧振。所設計的鎖頻與偵測演算法將利用可程式規劃邏輯陣列晶片(Field Programmable Gate Array，FPGA) 來實現。

A phase-locked-loop frequency-locking algorithm implemented on an FPGA is presented for an ultrasonic spray coating system. The algorithm generates a sine wave for driving the ultrasonic transducer and ensures the frequency of the sine wave to automatically follow the transducer resonance (or anti-resonance) frequency, thereby maximizing the conversion efficiency from electrical power to vibration power. By the observation, the transducer''s impedance becomes purely resistive at its resonance (or anti-resonance). So a digital phase locked loop is employed to track the transducer resonance (or anti-resonance) by adjusting the driving frequency to where the driving voltage and current are in phase. The targeted driving frequencies range from 20 kHz to 80 kHz. The experiments performed on different transducers in the ultrasonic spray coating system confirm the effectiveness of the algorithm.

審定書 i
致 謝 ii
摘 要 iii
Abstract iv
目　錄 v
圖目錄 vii
表目錄 ix
第 一 章 緒論 1
1.1 研究動機 1
1.2 文獻回顧 2
1.3 論文貢獻 5
第 二 章 超音波噴塗系統 6
2.1 超音波換能器 7
2.2 超音波換能器驅動於共振點與反共振點的特性 8
第 三 章 鎖相迴路基本操作原理 10
3.1 鎖相迴路簡介 10
3.2 鎖相迴路電路架構 10
3.2.1相位頻率偵測器 11
3.2.2充電泵與迴路濾波器 12
3.2.3電壓控制振盪器 13
第 四 章 鎖頻迴路應用於超音波噴塗系統 14
4.1 鎖相迴路應用於AB類驅動電路 14
4.1.1數位鎖頻演算法 16
4.2.2FPGA程式規劃 16
4.2鎖相迴路應用於D類驅動電路 22
第 五 章 量測結果 33
5.1 系統實作架構 33
5.1.1超音波AB類驅動系統實作架構 33
5.1.2超音波D類驅動系統實作架構 36
5.2 鎖頻效果量測 38
5.2.1將鎖相迴路用於AB類驅動電路的量測結果 38
5.2.2將鎖相迴路用於D類驅動電路的量測結果 40
第 六 章 結論 43
參考文獻 44

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