编号：
课程设计说明书
题目：OCL音频功率放大器
院（系）：信息与通信学院
专业：电子信息工程
学生姓名：蔡宝明
学号： 1200220707 指导教师：符强
2014年10月30日
摘要
OCL功率放大器是一种直接耦合的功率放大器，它具有频响宽，保真度高。动态特性好及易于集成化等特点。OCL是英文Output Capacitor Less 的缩写，意为无输出电容。采用双电源供电，使用了正负电源，在电压不太高的情况下，也能获得比较大的输出功率，省去了输出端的耦合电容。使放大器低频特性得到扩展。OCL功率放大电路也是定压式输出电路，由于电路性能比较好，所以广泛的应用在高保真扩音设备中。本次课程设计采用分立元件电路法设计一台OCL音频功率放大器。
设计的功率放大电路由三部分组成：输入级、推动级和输出级。输入级由有两个三极管组成差分放大电路，推动级由一个三极管组成，输出级由两个三极管对称构成。两输出管分别由正、负两组电源供电，扬声器直接接在两输出管的输出端与地之间，功率放大电路类型很多，目前电子电路中广泛采用乙类（或甲乙类）互补对称功率放大电路，所以这里只对乙类（或甲乙类）互补功率放大电路进行分析。
关键词：OCL功率放大器、双电源、分立元件电路法、互补功率放大电路
Abstract
OCL power amplifier is a kind of direct coupling of power amplifier, it has a wide frequency response, high fidelity.Good dynamic characteristics and easy integration, etc.The abbreviation of OCL is English the Output Capacitor Less, meaning no Output capacitance.With double power supply, the use of the positive and negative power supply, under the condition of the voltage is too high, also can obtain larger output power, saves the output coupling capacitance.The character of low frequency amplifier was expanded.OCL power amplification circuit and constant pressure output circuit, because the circuit performance is good, so widely used in the high fidelity audio amplifiers.The course design of discrete component circuit method is used to design an OCL audio power amplifier.
Design of power amplifier circuit consists of three parts: the input stage, promote the level and output level.Input stage is composed of two triode differential amplifier circuit, driver stage consists of a transistor, the output level consists of two triode symmetry.Two output pipe respectively by the positive and negative two sets of power supply, the speaker directly connect between the output pipe output terminal and ground, power amplification circuit type many, now widely used in electronic circuit b class (or class ab) complementary symmetry power amplifier circuit, so here only to b class (or class ab) complementary power amplification circuit is analyzed.
Key words:the OCL power amplifier, dual power supply, discrete element method, the complementary power amplification circuit
目录
引言 (5)
1 OCL功率放大器设计方案 (6)
1.1 OCL功率放大器设计的参数及要求 (6)
1.2 OCL功率放大器设计思路 (6)
1.3 总体设计方案框图 (6)
2电路主要器件选择及其参数 (7)
2.1 2N5551介绍 (7)
2.2 2N5401介绍 (7)
2.3 TIP41介绍 (8)
3 OCL功率放大器电路设计与分析 (9)
3.1 整体电路图设计 (9)
3.2 各级电路分析 (9)
3.2.1 输入级电路分析 (9)
3.2.2 推动级电路分析 (9)
3.2.3 输出级电路分析 (10)
4 电路板的制作及调试 (11)
4.1 PCB的印制与电路板的制作 (11)
4.2 电路板的调试 (12)
4.2.1调试过程中使用到的仪器 (12)
4.2.2电路板的调试过程 (12)
4.2.3调试参数的记录与分析 (12)
5 总结 (12)
谢辞 (14)
参考文献 (15)
附录 (16)
