高效功率音频放大器

^论文字数:10760,页数:24 

摘要：在音频领域发展的几十年里，A类，B类，AB类音频功率放大器一直占着主导地位，随着科技的不断发展，音频功率放大器也有了新的研究成果—D类功率放大器。D类功率放大器有很多优点，因为低功耗产生热量较少，节省印制电路板（PCB）面积和成本，并且能够延长便携式系统的电池寿命。D类放大器，是通过控制开关单元的ON/OFF，驱动扬声器的放大器。D类放大器是最近几年才发展起来的，在系统的耐用上以及音频质量等都有了很大的提高。
关键词：D类功率放大器、TDA8922TH、PWM调制、电压开关型驱动电路。
 In the audio field for decades, A Class, B Class, AB audio power amplifier has occupied the leading position, with the technology continuous development of the audio power amplifier also has a new research-D power amplifier. Class D power amplifier has many advantages, because the low-power generating less heat, saving printed circuit board (PCB) area and cost, and can extend battery life in portable systems. Class D amplifier, through the control switch unit ON / OFF, the amplifier drives the speaker. Class D amplifier is only developed in recent years, the durability of the system and so on and the audio quality has been greatly improved.
Key words: D power amplifier, TDA8922TH, PWM modulation, the voltage switching drive circuit.

目  录
一、绪论 3
1.1 D类功放的发展背景 3
1.2 D类功放诞生的原因 3
1.3功率放大器的基本组成 4
1.4 对功率放大器的基本要求 5
二、D类功放的特点与电路组成 6
2.1 功放的分类 6
2．2几类经典功放的工作原理点 6
2.4 D类功放的特点 9
2.5 D类功放的组成与原理 9
2.6 D类功放的要求 11
2.7 D类功放选择 13
三、结论 21
3.1 调试过程 22
3.2 毕业设计感想 22
四、致谢 23
五、参考文献 23

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