目录
摘要--------------------------------------------------------------------3 Abstract----------------------------------------------------------------3 第一章绪论
1.1 双声道BTL功放电路国内外发展现状与研究意义----4 1.2 双声道BTL功放电路设计内容以及要求-----------------5 1.3 方案设计以及方案比较---------------------------------------5 第二章系统原理框图与说明
2.1 BTL功率放大电路简介---------------------------------------7 2.2 BTL功放电路工作原理---------------------------------------7 2.3电路原理结构框图---------------------------------------------8 2.4 BTL电路原理---------------------------------------------------8 第三章双声道BTL单元电路设计与仿真
3.1电源电路-----------------------------------------------------------9 3.2电源前置放大电路----------------------------------------------11 3.3功率放大电路----------------------------------------------------13 3.4电路仿真----------------------------------------------------------16 第四章系统测试与整机指标
4.1 测试仪表---------------------------------------------------------18 4.2 测试方法与数据处理------------------------------------------18 总结---------------------------------------------------------------------18
致谢------------------------------------------------------------------------19 参考文献------------------------------------------------------------------20 附录------------------------------------------------------------------------20
摘要
了解和分析BTL分立元件的输入和输出特点，归纳出构成BTL电路的一般原则，同时介绍了集成功放电路在不同用法下如何构成BTL。在实际工作中使用起来更加方便容易。集成功率放大器由于不仅具有体积小、重量轻、成本低、外围元件少、安装调试简单、使用方便的优点；而且在性能上也优于分立元件，例如温度稳定性好，功耗小、失真小，特别是集成功率放大器内部还设置有过热、过电流、过电压等自动保护功能的电路对电路自行进行保护。由于集成功率放大器具有分立元件不具有的很多优点，近年来集成功率放大器件发展很快，使用相当广泛。集成功放在实际应用中通常接成OCL电路，或OTL电路，接成BTL（Balanced Transformer Less）电路却很少，而BTL电路的优点是电源利用率比前面两种电路高4倍。采用音频电位器控制，通过改变输入音频功放的电压大小，从而改变输出声音大小。整体电路连接，输入小音频信号，接通电源，便可听到放大后的双声音频效果。
关键字：BTL电路；集成功率放大器；电位器
Abstract
BTL circuit analysis division element and the input signal and the characteristics of the output signal, summarized the BTL circuit constitute the general principle, and introduces the integrated amplifier circuit different usage in how to constitute BTL. In practical work convenient for operation easy. Integrated power amplifier has not only because of its small volume, light weight, low cost, peripheral less component, installation and debugging of the advantages of simple and easy to use; And the performance is better than division components, like temperature stability, low consumption, distortion is small, especially integrated internal power amplifier is set overheated, over electric current, over voltage and automatic protection function of the circuit to circuit to make their own protection. Due to the integrated power amplifier has elements have divided in recent years many advantages, and integrated power amplifier device development soon, use very wide. Set on the practical application of success usually take into OCL circuit, or OTL circuit, then into BTL (Balanced Transformer Less) circuit, and BTL circuit but rarely the advantages of power utilization rate is more than the first two circuit four times as high. The audio potentiometer, through the change control input audio power amplifier, which changes the output voltage size voice size. The whole circuit connection, input small audio signal, switch on the power, and you can hear the audio amplification sees effect.
Keywords: BTL circuit;integrated power amplifiers;potentiometer
