本科学生毕业论文
论文题目：学 院：年 级：专 业：姓 名：学 号：指导教师： D类音频功率放大器的设计
电子工程学院 2012级 电子信息工程
年 月 日
摘要
在过去的近一个世纪的时间里，音频功率放大器随着电子器件的制作工艺越来越精湛也在不断发展更新。主要经过了电子管阶段，晶体管阶段，集成电路阶段及场效应管四个阶段。在工作方式上，功率放大器从最初的A、B类不断发展到在现今占有统治地位的AB类放大器以及具有更高效率的D类音频功率放大器。基于D类功放具有效率高、散热小、体积小、适用于大功率放大器等特点，其在未来必定逐渐抢占AB类放大器的市场。
D类功率放大器件因其受脉冲PWM信号的控制，使其处于开关的工作状态。在理想情况下，其工作效率可达100%。本课题的目的主要是完成一个D类音频功率放大器的设计。完成对输入的音频信号进行放大，输出功率设置在0~5W之间，且输出信号无明显的失真，并完成对其功率及音量的大小进行显示输出等功能。
关键词
D类放大器；脉冲宽度调制；功率
I
Abstract
In the past one century's time, the development of audio power amplifier in the material with the production process of electronic devices more and more excellent also in the continuous development and renewal. Mainly through the tube, transistor stage, integrated circuit and FET four stages. In the work, from the initial A, class B amplifier development class AB amplifier occupies a dominant position in the current and class D audio power amplifier has higher efficiency. Based on class D amplifier with high efficiency, low heat dissipation, small size, suitable for high power amplifier and other features, in the future will gradually to seize the AB class amplifier market.
D class power amplifier device because of its control of the pulse signal, so that it is in the working state of the switch. Under ideal circumstances, the working efficiency can reach 100%. The main purpose of this project is to complete the design of a class D audio power amplifier. Amplification of the audio signal to the input and output power settings in 0~5W, and the output signals have no obvious distortion, and the completion of the power and the size of the volume display output function.
Key words
Class D amplifier; Pulse width modulation; power
II
目录
摘要 ............................................................................................................................................ I Abstract ................................................................................................................................... II 目录 ........................................................................................................................................... 1 第一章 引言 ............................................................................................................................. 1
1.1 研究背景与现状 ........................................................................................................ 1 1.2 设计目的与意义 ........................................................................................................ 1 1.3 论文主要内容 ............................................................................................................ 2 第二章 功率放大器的简介 ..................................................................................................... 4
2.1 放大器的性能指标 .................................................................................................... 4 2.2 功率放大器的种类 .................................................................................................... 5
2.2.1 A类功率放大器原理 ...................................................................................... 5 2.2.2 B类功率放大器原理 ...................................................................................... 5 2.2.3 AB类功率放大器原理 .................................................................................... 6 2.2.4 D类功率放大器原理 ...................................................................................... 7 2.3 小结 .......................................................................................................................... 8 第三章 原器件介绍 ................................................................................................................. 9
3.1 TDA2030音频功法电路特性 ..................................................................................... 9 3.2 STC12单片机的基本特性 ....................................................................................... 10 3.3 LCD1602液晶显示器简介 ....................................................................................... 10 3.4 小结 .......................................................................................................................... 11 第四章 D类音频功率放大器电路设计 ................................................................................ 13
4.1 TDA2030音频放大整体电路 ................................................................................... 13
4.1.1 拾音输入电路 ............................................................................................... 13 4.1.2 负反馈电路 ................................................................................................... 14 4.1.3 输出电路 ....................................................................................................... 14 4.2 显示模块电路 .......................................................................................................... 15
4.2.1 STC12主控电路 ............................................................................................ 15
相关推荐：
loading