东北石油大学课程设计2015年7月24日课程通信电子线路课程设计题目高效音频功率放大器院系电气信息工程学院专业班级信13-2学生姓名李笥岐学生学号130602140215指导教师张秀艳、阚玲玲东北石油大学课程设计任务书课程通信电子线路课程设计题目高效音频功率放大器专业通信工程姓名李笥岐学号130602140215主要内容、基本要求、主要参考资料等主要内容:设计一个高效音频功率放大器。功率放大器的电源电压为+5V电路其他部分的电源电压不限),负载为8欧姆的电阻。基本要求:(1)功率放大器a.3dB通频带为300Hz~3400Hz,输出正弦信号无明显失真。b.最大不失真输出功率≥1W,输入阻抗>10k,电压放大倍数1~20连续可调。(2)设计并制作一个放大倍数为1的信号变换电路,将功率放大器双端输出的信号转换为单端输出,经RC滤波供外接测试仪表用。(3)设计并制作一个测量放大器输出功率的装置,要求具有3位数字显示,精度优于5%。主要参考资料:[1]高扬.AB类音频功率放大器产生选型指南[J].电子设计应用,2009,13(2):78~85.[2]雍家鹏.D类音频功率放大器的研究与设计[J].微电子学与固定电子学,2008,15(6):154~164.[3]徐良雄.基于可编程控制器施密特触发器的分析与设计[J].电气传动自动化,2012,02(2):13~18.完成期限2015年7月20日~2015年7月24日指导教师专业负责人2015年7月20日摘要本设计主要由功率放大器、信号变换电路和输出功率显示电路组成。功率放大器部分采用D类功率放大器确保高效率,在5V供电情况下输出功率大于1W,且输出波形无明显失真,低频输出噪声电压很低(输出频率为20kHz以下时低频噪声电压约1mV);信号变换部分采用差分放大电路,将双端输出信号变为1:1的单端输出信号;输出功率显示部分用乘法器电路及带A/D转换的电压表表头显示功率值,电路简单合理。本文中的D类音频功率放大器的功率器件受一种高频脉宽调制信号的控制工作在开关状态,理论上其效率可以达到100%,其不足之处在于会产生高频干扰及噪声,但是若精心设计低通滤波器及合理地选择元器件参数,其音质噪声完全能够满足人们的需求。关键词:D类放大器;脉宽调制器;H桥互补输出电路;低通滤波器目录1.设计要求······································································错误!未定义书签。2.方案设计······································································错误!未定义书签。3.方案论证································································································13.1高效功率放大器······················································错误!未定义书签。3.2信号变换电路···················································································23.3功率测量电路···················································································34.单元电路设计、参数计算和器件选择·····························································34.1三角波产生电路················································································34.2比较器电路······················································································44.3音频前置放大电路...