- 學位論文
應用音效放大技術於壓電馬達驅動器之設計
The Design of Audio Amplifier Technique For Piezoelectric Motor Driver
摘要
本研究目標主要是利用音效放大技術之電壓控制放大器(Voltage Control Amplifier,VCA )，研製應用於壓電陶瓷致動器之功率放大驅動電路。此電壓控制放大器之輸出電壓大小可由輸入電壓決定，利用其具有可隨輸入直流電壓之不同而改變輸出交流訊號振幅的特性，只要把VCA電路設計在線性區內，即可利用此特性做為電腦端與放大電路端之間的溝通橋樑。利用D類放大器(Class-D Amplifier)當作驅動電路中功率放大之核心，並將其中之脈寬調變產生方式改良為自激產生脈寬調變訊號；放大器後端所使用之LC濾波方式，更可以有效解決因為壓電陶瓷致動器之電容性造成電路匹配之問題。所發展之新型驅動器，不僅可以縮小以往驅動器龐大體積，且可提高使用效率，同時於電路設計上亦降低電路之複雜程度。經實驗驗證所設計之驅動電路可以滿足功能需求。
並列摘要
Using voltage control amplifier on the basis of audio amplifier technique to drive a piezoelectric motor is the main focus of this article. Output voltage of the voltage control amplifier can be determined by the input voltage command. Since the output alternate current signal is changed following the input DC voltage signal, the bridge between PC and amplifier circuit can thus be linked as long as the circuit of voltage control amplifier is designed in the liner range. Class-D amplifier is used as the core of the driver. Generation of PWM signal is improved by using Self-Oscillating PWM. LC filter is used and implemented in the Back amplifier so that matching impedance between the piezoelectric capacitance and the circuit becomes easier and more efficient. The proposed driving circuitry has good merits of small volume and less complexity and high efficiency. Experimetn is carried out and presented to verify its performance.