毕业设计《音频功率放大器》完整版.rar
毕业设计《音频功率放大器》完整版,摘 要在音频功率放大器的市场上，ab类一直处于统治地位。近年来，随着mp3、dvd和移动电话等便携式消费电子产品的普及，d类音频功率放大器以高效率、低功耗、小体积的优点日益成为音响领域的主流，在未来便携式和大功率音频视频领域中将具有广阔的发展前景，因此对高效音频功率放大器的设计具有十分重要的意义。本设计根据d类放大器的...
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内容介绍
原文档由会员 渭水亭榭 发布
摘 要
在音频功率放大器的市场上，AB类一直处于统治地位。近年来，随着MP3、DVD和移动电话等便携式消费电子产品的普及，D类音频功率放大器以高效率、低功耗、小体积的优点日益成为音响领域的主流，在未来便携式和大功率音频视频领域中将具有广阔的发展前景，因此对高效音频功率放大器的设计具有十分重要的意义。
本设计根据D类放大器的工作原理设计的D类音频功率放大器，能对音频信号进行放大，放大器的通频带达到300~3400HZ，输出功率1W，输出信号无明显失真。根据D类功放的原理分别设计了前置放大模块、三角波产生模块、比较器模块、驱动模块、H桥互补对称输出及低通滤波模块等。其中三角波产生器及比较器共同组成脉宽调制（PWM）模块，H桥互补对称输出电路采用驱动电流小、低导通电阻及良好开关特性的VMOSFET管，滤波器采用两个相同的四阶Butterworth低通滤波器。
关键词：高效，音频，D类功放，放大器
Abstract
In the audio amplifier market. AB has been the dominant class. In recent years, along with MP3，DVD and mobile phones, the popularity of portable consumer electronic products, D audio power amplifier with high efficiency, low power, small size advantage of the field is increasingly becoming the mainstream audio, portable and high-power audio in the future Video area will have a bright future. Therefore, efficient audio power amplifier design is of great significance.
According to the working principle of class D amplifier, this product is designed and the audio signal can be amplified to the amplifier’s pass band to 300 ~ 3400 HZ, the output power 1W, the output without significant distortion. Class D amplifier according to the principle of preamp modules were designed, triangular wave generator module, comparison module, driver module, H bridge output and the complementary symmetric low-power filter module. One triangular wave generator and pulse width modulation comparator common form (PWM) module, H bridge output circuit using complementary symmetry drive current, low resistance and good switching characteristics of VMOSFET tube, filter uses two identical fourth-order Butterworth low-pass filter.
KEY WORDS: High-Efficient, Audio, Class D amplifier, Amplifier
目 录
1 绪论 ................................................................................................1
1.1 音频功率放大器概述 ................................................................1
1.2 D类音频功率放大器的发展现状 ................................................................2
1.3 本论文主要内容 ................................................................................3
2 音频功率放大器 ................................................................................4
2.1 音频功率放大器的指标 ................................................................4
2.1.1 THD+N指标 ................................................................................4
2.1.2 功率放大器的效率η ................................................................4
2.1.3 最大输出功率（POCM） ................................................................4
2.1.4 脉冲宽度调制（PWM） ................................................................5
2.1.5 转换速率 ................................................................................6
2.2 功率放大器的分类 ................................................................................6
2.2.1 A类放大器 ................................................................................6
2.2.2 B类放大器 ................................................................................7
2.2.3 AB类放大器 ................................................................................8
2.2.3 D类放大器 ................................................................................8
2.2.4 T类放大器 ................................................................................9
2.3音频功放的主要技术指标 ................................................................9
3 D类功率放大器 ................................................................................11
3.1 D类放大器原理 ................................................................................11
3.2 D类放大器的系统分析 ................................................................12
3.3 综合比较 ................................................................................13
4 D类音频功率放大器的设计 ................................................................14
4.1设计任务与要求 ................................................................................14
4.1.1 设计任务 ................................................................................14
4.1.2 设计要求 ................................................................................14
4．2方案论证与比较 ................................................................................14
4.2.1 脉宽调制器（PWM） ................................................................14
4.2.2 高速开关电路 ................................................................................15..
在音频功率放大器的市场上，AB类一直处于统治地位。近年来，随着MP3、DVD和移动电话等便携式消费电子产品的普及，D类音频功率放大器以高效率、低功耗、小体积的优点日益成为音响领域的主流，在未来便携式和大功率音频视频领域中将具有广阔的发展前景，因此对高效音频功率放大器的设计具有十分重要的意义。
本设计根据D类放大器的工作原理设计的D类音频功率放大器，能对音频信号进行放大，放大器的通频带达到300~3400HZ，输出功率1W，输出信号无明显失真。根据D类功放的原理分别设计了前置放大模块、三角波产生模块、比较器模块、驱动模块、H桥互补对称输出及低通滤波模块等。其中三角波产生器及比较器共同组成脉宽调制（PWM）模块，H桥互补对称输出电路采用驱动电流小、低导通电阻及良好开关特性的VMOSFET管，滤波器采用两个相同的四阶Butterworth低通滤波器。
关键词：高效，音频，D类功放，放大器
Abstract
In the audio amplifier market. AB has been the dominant class. In recent years, along with MP3，DVD and mobile phones, the popularity of portable consumer electronic products, D audio power amplifier with high efficiency, low power, small size advantage of the field is increasingly becoming the mainstream audio, portable and high-power audio in the future Video area will have a bright future. Therefore, efficient audio power amplifier design is of great significance.
According to the working principle of class D amplifier, this product is designed and the audio signal can be amplified to the amplifier’s pass band to 300 ~ 3400 HZ, the output power 1W, the output without significant distortion. Class D amplifier according to the principle of preamp modules were designed, triangular wave generator module, comparison module, driver module, H bridge output and the complementary symmetric low-power filter module. One triangular wave generator and pulse width modulation comparator common form (PWM) module, H bridge output circuit using complementary symmetry drive current, low resistance and good switching characteristics of VMOSFET tube, filter uses two identical fourth-order Butterworth low-pass filter.
KEY WORDS: High-Efficient, Audio, Class D amplifier, Amplifier
目 录
1 绪论 ................................................................................................1
1.1 音频功率放大器概述 ................................................................1
1.2 D类音频功率放大器的发展现状 ................................................................2
1.3 本论文主要内容 ................................................................................3
2 音频功率放大器 ................................................................................4
2.1 音频功率放大器的指标 ................................................................4
2.1.1 THD+N指标 ................................................................................4
2.1.2 功率放大器的效率η ................................................................4
2.1.3 最大输出功率（POCM） ................................................................4
2.1.4 脉冲宽度调制（PWM） ................................................................5
2.1.5 转换速率 ................................................................................6
2.2 功率放大器的分类 ................................................................................6
2.2.1 A类放大器 ................................................................................6
2.2.2 B类放大器 ................................................................................7
2.2.3 AB类放大器 ................................................................................8
2.2.3 D类放大器 ................................................................................8
2.2.4 T类放大器 ................................................................................9
2.3音频功放的主要技术指标 ................................................................9
3 D类功率放大器 ................................................................................11
3.1 D类放大器原理 ................................................................................11
3.2 D类放大器的系统分析 ................................................................12
3.3 综合比较 ................................................................................13
4 D类音频功率放大器的设计 ................................................................14
4.1设计任务与要求 ................................................................................14
4.1.1 设计任务 ................................................................................14
4.1.2 设计要求 ................................................................................14
4．2方案论证与比较 ................................................................................14
4.2.1 脉宽调制器（PWM） ................................................................14
4.2.2 高速开关电路 ................................................................................15..
