基于MC1495的有效值音频数字功率计的设计  

Design on RMS Audio Digital Powermeter Based on MC1495

作　　者：尹继武[1] 

机构地区：[1]陕西理工学院电信工程系,陕西汉中723003

出　　处：《电声技术》2007年第9期38-41,共4页Audio Engineering

摘　　要：利用模拟乘法器MC1495实现负载电流与电压的乘积运算,经电平转换,滤波,由ICL7107完成A/D转换并驱动LED数码管,设计了有效值音频电功率计,实现对音频信号作用下负载有功功率的测量和数字显示,工作频率可从直流扩展到100kHz。电功率测量满度误差不超过±3%。可方便地作为一个独立单元插入到各类音频功率设备中。Based on the principle that power is equal to the product of current and voltage, a RMS audio digital powermeter is designed. Analog multiplier MC1495 is used to generate the product of load current and voltage. A/l） converter ICL7107 is employed to drive LED display. The active power of complex audio signal can be measured. The power error is below ±3%, and operating frequency can be expanded from DC to 100 kHz.

关 键 词：音频 数字功率计 有功功率 模拟乘法器 

分 类 号：TM933.3[电气工程—电力电子与电力传动]