多維度量化調變技術於六開關音頻放大器之應用

Abstract

本論文提出了一種多維度量化的六開關脈波寬度調變開關模式。當揚聲器使用的數量大時，如果每一個揚聲器是由一獨立驅動控制，驅動電路會變得昂貴和笨重的。所提出的架構允許共用驅動架構在揚聲器之間，而降低開關裝置的數量。該架構採用開關狀態進行了分析，其目的在減少驅動電路架構所需的控制元件。模擬結果說明了該方法的有效性，使用六開關脈波寬度調變實現六開關揚聲器驅動。考慮輸入電壓與輸出電壓開關限制，以得到最大的輸出範圍。此外，也提出一種以傳統脈波寬度調變的控制方式做為比較。為了進一步了解實際的可行性，本文以三星電子生產的ARM9晶片實現所提之多維度量化調變技術於六開關音頻放大器之應用，且利用電壓頻譜做測試加以驗證。

In this thesis, a six-switch pulse width modulation mode is proposed. When the number of loudspeakers used is large, the driver circuity becomes expensive and bulky if each speaker is controlled by an independent driver. The proposed architecture allows sharing of the driver architecture between the loudspeakers while reducing the number of switching devices. The architecture is analyzed using switching states, with the goal of reducing the control elements required in the architecture. The simulation results show the effectiveness of the proposed method. Six-switch pulse width modulation is used to realize six-switch speaker driving. We consider the input voltage and output voltage switch limits to get the maximum output range. The results of the conventional six-switch pulse-width modulation (PWM) are also provided for comparison. All the controls are implemented in Samsung Electronics production of ARM9 chip to verify the proposed method. Finally, we verify the difference between six-switch pulse width modulation and multi-dimension quantized modulation pulse width modulation by simulation and experiment.