一款可变增益的电压信号采集电路设计  

Design of a voltage signal acquisition circuit with variable gain

作　　者：江振青 胡振山 吕海燕 Jiang Zhenqing;Hu Zhenshan;Lyu Haiyan(Linyi University,Linyi 276000,China)

机构地区：[1]临沂大学,山东临沂276000

出　　处：《无线互联科技》2021年第13期67-71,共5页Wireless Internet Technology

基　　金：临沂大学2020年校级大学生创新创业训练项目,项目编号:X202010452055;临沂大学引进博士科研启动基金,项目编号:LYNDX2018BS051。

摘　　要：在现代电气仪表和传感器系统中,电压信号采集电路应用广泛。文章通过对常用信号处理电路进行整合与改进,设计了一款能够在保证精度的同时,可以使用低成本元件实现的可变增益的电压信号采集与变换电路。本设计避免了手动挡位调整,增加了测量的灵活性。采用正负5 V双电源供电,具有宽电压输入、高输入阻抗、低输出阻抗、增益可调、低功耗和小型化的特点。该电路输出信号完整保留了输入信号的信息,便于后级电路进行信号处理。In modern electrical instruments and sensor systems,voltage signal acquisition circuits are widely used.This article integrates and improves common signal processing circuits to realize a voltage signal acquisition and conversion circuit with variable gain that can be realized with low-cost components while ensuring accuracy.This design avoids manual gear adjustment and increases the flexibility of measurement.It adopts positive and negative 5 volt dual power supply,with wide voltage input,high input impedance,low output impedance,adjustable gain,low power consumption and miniaturization.The output signal of the circuit completely retains the information of the input signal,which is convenient for the subsequent circuit to perform signal processing.

关 键 词：电气仪表 电压采集 自动增益控制 精密整流电路 

分 类 号：TM930[电气工程—电力电子与电力传动]