壓電致動器功率驅動電路之設計

Power Driver Design for Piezoelectric Actuator

侯秉寬(Bing-Kuan Hou)

指導教授 ： 丁鏞

中原大學/工學院/機械工程研究所/碩士(2009年)

https://doi.org/10.6840/cycu200900278

摘要

本研究是設計一應用於壓電致動平台系統之功率放大驅動電路，此放大電路是以D類放大器為設計基礎。自激振盪PWM模組可由回授產生切換信號，不需額外提供切換信號，此模組功能為將類比信號調變為數位信號，由誤差放大電路、比較器、回授控制器、數位緩衝器及準位調整電路組成。功率放大模組是由功率驅動電路和功率放大電路組成，使用目前最常見之切換式技術，以獲得較高之工作效率；濾波模組是以LC型巴特沃斯濾波器為主，搭配壓電致動器之電容性負載特性，設計能為將衰減合成信號中之高頻信號予以還原其波形之濾波器。最後進行實驗，實際驅動壓電致動平台系統並量測其輸出信號與增益值，驗證其功能。

關鍵字

自激振盪PWM ； 功率放大器 ； D類放大器 ； 壓電致動器

並列摘要

In this thesis, designing a power driver based on Class-D amplifier for piezoelectric actuator is the primary goal. Self oscillating PWM modulation is constructed with error amplifier, comparator, feedback controller, digital buffer, and level shifter. This modulation is able to convert analog signal to digital signal by switching signals in the feedback with no need of extra switching signals. Power amplifier modulation is composed of power drive and power amplifier, which makes use of switched-mode technique in order to gain higher power efficiency. Filter modulation is designed based upon the Butterworth filter associated with the characteristics of capacitive load of piezoelectric actuator. Such filter modulation can attenuate high-frequency synthesized signal so as to restore its original waveform efficiently. Finally, function test and performance evaluation is carried out in experiment.

並列關鍵字

self oscillating pwm ； power amplifier ； Piezoelectric actuator ； Class D amplifier

參考文獻

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