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D类音频功率放大器的关键技术
引用本文:朱高峰,吴黎明,王桂棠,张艳蕾.D类音频功率放大器的关键技术[J].声学技术,2006,25(5):452-456.
作者姓名:朱高峰  吴黎明  王桂棠  张艳蕾
作者单位:广东工业大学信息工程学院,广州,510643
基金项目:广东省科技计划项目(2005B10201017)
摘    要:随着移动音频设备的迅速发展,传统的模拟线性放大器已不能满足大功率输出同时发热量少的要求,而D类放大器能克服以上缺点,但其引入的失真通常大于线性放大器,研究适合的控制方法以改善D类放大器的保真度,是近年来声学技术和音频功率放大领域研究的热点。本文除了介绍D类放大器的基本原理之外,还着重分析了几种新型的关键控制技术以及元器件选择、电磁兼容、电路板布局方面需要重视的一些问题。

关 键 词:PWM(脉冲宽度调制)  THD(谐波畸变率)  单周控制  动态补偿  EMI(电磁干扰)
文章编号:1000-3630(2006)-05-0452-05
收稿时间:2005-09-28
修稿时间:2005-09-282005-12-29

Key techniques of class D audio power amplifier
ZHU Gao-feng,WU Li-ming,WANG Gui-tang,ZHANG Yan-lei.Key techniques of class D audio power amplifier[J].Technical Acoustics,2006,25(5):452-456.
Authors:ZHU Gao-feng  WU Li-ming  WANG Gui-tang  ZHANG Yan-lei
Affiliation:Information Engineering Institute of Guangdong University of Technology, Guangzhou 510643, China
Abstract:With the rapid development of mobile audio equipment,conventional linear amplifiers can no longer meet the requirements of large power with low heat radiation.In this respect,class D ampli-fier has good performance as a switching power amplifier.However its distortion is greater than amplifiers.New control techniques to improve fidelity of class D amplifier have been studied in recent years.In this paper,the principle of D amplifiers is presented.Some control techniques including component selection,electromagnetic compatibility,and PCB layout are discussed.Using these techniques,efficiency of 90% can be achieved,and distortion can be made below 0.5%.
Keywords:pulse width modulation  total harmonic distortion  one cycle control  dynamic compensation  electromagnetic interference  
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