| 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,(5):452~456 |
| D类音频功率放大器的关键技术 |
| Key techniques of class D audio power amplifier |
| 投稿时间：2005-09-28 修订日期：2005-12-29 |
| DOI： |
| 中文关键词: 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) |
| 英文关键词: pulse width modulation total harmonic distortion one cycle control dynamic compensation electromagnetic interference |
| 基金项目:广东省科技计划项目(2005B10201017) |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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 amplifier 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%. |
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