基于STC12C5410AD單片機(jī)的數(shù)字功率放大器設(shè)計(jì)

電子信息工程論文編號:DZXX108  論文字?jǐn)?shù):12312,頁數(shù):42 
目  錄

摘要 I
ABSTRACT II
第1章 緒論 1
1.1 課題的背景 1
1.2 課題的意義 2
1.3 課題的目標(biāo) 3
第2章 設(shè)計(jì)方案論證 5
2.1 D類功率放大器 5
2.2采用常規(guī)、通用元器件設(shè)計(jì)D類數(shù)字功率放大器的實(shí)現(xiàn)方案 6
2.2.1 高效率音頻功率放大器的組成框圖 6
2.2.2 單元電路及工作原理 6
2.2.3 小結(jié) 10
2.3采用單片機(jī)設(shè)計(jì)與制作D類數(shù)字功率放大器的實(shí)現(xiàn)方案 10
第3章 數(shù)字功放系統(tǒng)硬件設(shè)計(jì) 12
3.1前置音頻采集放大器電路的設(shè)計(jì) 12
3.2后向驅(qū)動電路設(shè)計(jì) 16
3.2.1 采用H型橋式功率放大器實(shí)現(xiàn)驅(qū)動 16
3.2.2 采用單端推挽輸出電路實(shí)現(xiàn)驅(qū)動 18
3.3 STC12C5410AD單片機(jī) 19
3.4系統(tǒng)總體電路圖 26
第四章 系統(tǒng)軟件設(shè)計(jì) 28
4.1概述 28
4.2程序主模塊 29
第五章 設(shè)計(jì)指標(biāo)的驗(yàn)證 32
第六章 系統(tǒng)設(shè)計(jì)總結(jié) 34
致  謝 35
參考文獻(xiàn) 36
附錄1 子程序 37

摘要

 D類數(shù)字功率放大器以其極高的效率逐漸為人們所青睞，在大功率、超低音的功率放大電路中已廣泛使用。D類功率放大器早在1958年就有構(gòu)想和實(shí)驗(yàn)電路，由于當(dāng)時(shí)技術(shù)條件的限制，進(jìn)展一直較慢，但是引起了廣大音頻功率放大器設(shè)計(jì)師的關(guān)注。從1999開始D類數(shù)字功率放大器開始興起，市場日益擴(kuò)大。
 本文通過對采用常規(guī)元器件和采用單片機(jī)設(shè)計(jì)與制作D類數(shù)字功率放大器的兩種方案的論證，鑒于對成本的分析計(jì)算和適用范圍寬廣的考慮，最后采用單片機(jī)方案來實(shí)現(xiàn)數(shù)字功率放大器的設(shè)計(jì)。本設(shè)計(jì)采用STC12C5410AD單片機(jī)，其核心作用是用程控的方式實(shí)現(xiàn)把音頻信號轉(zhuǎn)換成不同占空比的PWM方波信號輸出。PWM方波輸出后經(jīng)單端推挽電路功率放大后經(jīng)低通濾波器可得到所需功率的音頻信號。

關(guān)鍵詞：D類放大器；單片機(jī)；低通濾波器

ABSTRACT

 Class-D amplifiers win people favour because of their excellent efficiency,and they have been used extensively in the Power-enlargement electrocircuit which need high power and ultra bass.The blueprint and the experimental electrocircuit about the class-D amplifiers had already been given birth since 1958,but because of the low technology then and there,they had little headway during a long time. But that arosed numerous experts’ attention. And this technology has been springing up since 1999,so the foreground become better and better.
 This paper discussed two kinds of projects that one adopt the groovy equipments and the other adopt a single-chip microprocessor design and create class-D amplifiers. I analyzed and calculated the cost and the service scope, Finally, I adopted a single-chip microprocessor project to cope with the design of class-D amplifier. This product designed with a single-chip microprocessor of the STC12C5410AD what the key-function is change audio-signal by program controls into the different space of PWM and output. PWM transits by unilateral push-pull and Power-enlargement electrocircuit and then through low-pass filter. At last we get the right power audio-signal.
 
 Keywords：class-D amplifier;single-chip microprocessor;low-pass filter