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论文编号 ZXX108 论文字数:12312,页数:42
摘要
D类数字功率放大器以其极高的效率逐渐为人们所青睐，在大功率、超低音的功率放大电路中已广泛使用。D类功率放大器早在1958年就有构想和实验电路，由于当时技术条件的限制，进展一直较慢，但是引起了广大音频功率放大器设计师的关注。从1999开始D类数字功率放大器开始兴起，市场日益扩大。
本文通过对采用常规元器件和采用单片机设计与制作D类数字功率放大器的两种方案的论证，鉴于对成本的分析计算和适用范围宽广的考虑，最后采用单片机方案来实现数字功率放大器的设计。本设计采用STC12C5410AD单片机，其核心作用是用程控的方式实现把音频信号转换成不同占空比的PWM方波信号输出。PWM方波输出后经单端推挽电路功率放大后经低通滤波器可得到所需功率的音频信号。
关键词：D类放大器；单片机；低通滤波器
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
目 录
摘要 I
ABSTRACT II
第1章 绪论 1
1.1 课题的背景 1
1.2 课题的意义 2
1.3 课题的目标 3
第2章 设计方案论证 5
2.1 D类功率放大器 5
2.2采用常规、通用元器件设计D类数字功率放大器的实现方案 6
2.2.1 高效率音频功率放大器的组成框图 6
2.2.2 单元电路及工作原理 6
2.2.3 小结 10
2.3采用单片机设计与制作D类数字功率放大器的实现方案 10
第3章 数字功放系统硬件设计 12
3.1前置音频采集放大器电路的设计 12
3.2后向驱动电路设计 16
3.2.1 采用H型桥式功率放大器实现驱动 16
3.2.2 采用单端推挽输出电路实现驱动 18
3.3 STC12C5410AD单片机 19
3.4系统总体电路图 26
第四章 系统软件设计 28
4.1概述 28
4.2程序主模块 29
第五章 设计指标的验证 32
第六章 系统设计总结 34
致 谢 35
参考文献 36
附录1 子程序 37 |
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发表于 20:51