D类音频功放输出LC低通滤波器滤波电容的选择分析  

Analysis on Selection of Filter Capacitors for Class D Audio Power Amplifier Output LC Low-pass Filter

作　　者：潘志祥 魏路军 龚平 PAN Zhixiang;WEI Lujun;GONG Ping(Sichuan Hushan Electric Appliance Co.,Ltd.,Sichuan 621000,China)

机构地区：[1]四川湖山电器股份有限公司,四川621000

出　　处：《集成电路应用》2023年第9期16-18,共3页Application of IC

摘　　要：阐述D类音频功放输出LC低通滤波器滤波电容的选择方法,对电压参数相同(250V)、电容容值相同(1μF)、频率(1kHz)损耗角正切值接近的三个品牌金属化聚丙烯薄膜电容器的Q值测试,以及将电容器装入D类音频放大器,进行失真度、信噪比等参数的对比测试,再通过对金属化聚丙烯薄膜电容器的基础材料以及加工工艺的研究发现,无极性的PP膜,通过端面喷金工艺生产的金属化聚丙烯薄膜电容器具有良好的滤波效果。This paper describes the selection of filter capacitors for class D audio power amplifier output LC low-pass filter.Through the Q value test of three brands of metallized polypropylene film capacitors with the same voltage parameter(250V),capacitance value(1μF)and similar frequency(1KHz)loss angle tangent value,as well as the comparison test of distortion,signal-to-noise ratio and other parameters when the capacitors are loaded into Class D audio amplifier,and the research on the basic materials and processing technology of metallized polypropylene film capacitors,it is found that:non-polar PP film,The metallized polypropylene film capacitor produced by the end face gold spraying process has good filtering effect.

关 键 词：D类音频功率放大器 LC低通滤波器 金属化聚丙烯薄膜电容器 Q值 

分 类 号：TN761[电子电信—电路与系统]