| D类音频功率放大器的关键技术 |
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| 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. |
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| 作者姓名： | 朱高峰 吴黎明 王桂棠 张艳蕾 |
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| 作者单位： | 广东工业大学信息工程学院,广州,510643 |
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| 基金项目： | 广东省科技计划项目(2005B10201017) |
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| 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。
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| 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 |
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| ZHU Gao-feng,WU Li-ming,WANG Gui-tang and ZHANG Yan-lei.Key techniques of class D audio power amplifier[J].Technical Acoustics,2006,25(5):452-456. |
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| Authors: | ZHU Gao-feng WU Li-ming WANG Gui-tang and ZHANG Yan-lei |
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| Affiliation: | Information Engineering Institute of Guangdong University of Technology, Guangzhou 510643, China |
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| 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%. |
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| Keywords: | pulse width modulation total harmonic distortion one cycle control dynamic compensation electromagnetic interference |
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