應用音頻放大器設計功率驅動電路

本研究目標為設計壓電致動器之功率放大驅動電路。此驅動器電路包含電壓控制放大器(Voltage Control Amplifier, VCA)電路、D類放大器(Class-D Amplifier)電路、方向選擇電路。本研究所設計之VCA電路是由全波整流器、方波產生器與積分器所組成，其信號控制範圍可大於之前所使用之音頻放大IC。功率放大是以D類放大器為基準，其中脈寬調變訊號是由單晶片所產生，D類放大器後端使用LC濾波方式，此濾波器搭配壓電致動器之電容性負載特性，可將衰減合成信號中之高頻信號予以還原其波形。方向選擇電路以MOSFET取代TRIAC，可簡化其電路設計。最後，經實驗測試驗證所設計之驅動電路可達到提高驅動器的精度，亦可降低電路之複雜度，也可以減少能源的消耗之目標。

關鍵字

LC濾波器；壓電致動器； D類放大器；電壓控制放大器

並列摘要

The objective of this research is to design a driving circuitry of power amplifier for application to piezoelectric actuators. The circuit design consists of the Voltage Control Amplifier (VCA) circuit, the class-D amplifier circuit, and the direction selection circuit. The VCA circuit consists of the full-wave rectifier, the square wave generator, and the integrator. The range of control signal of VCA is greater than that of the previous designed audio amplification Integrated Circuit (IC). The power amplifier is designed base upon a class-D amplifier. The pulse width modulation (PWM) of the class-D amplifier is generated by a single chip. 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. MOSFET is used for the direction selection circuit to replace TRIAC for the purpose of simplifying the circuit design. Finally, via the experimental test, the design of the driving circuitry is verified to be able to improve accuracy as well as reduce circuit complexity and energy consumption.

並列關鍵字

LC filter ； class-D amplifier ； piezoelectric motor ； voltage control amplifier (VCA)

參考文獻

[23] 侯秉寬, “壓電致動器功率驅動電路之設計,” 私立中原大學,機工程學系, 碩士論文, 2008.

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國際替代計量

應用音頻放大器設計功率驅動電路

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