具有阈值电压自动设定和调节功能的电压比较器设计及FPGA实现  

Design and FPGA Implementation of Voltage Comparator with Automatic Threshold Voltage Setting and Adjusting

作　　者：詹贵阳 曾以成 ZHAN Guiyang;ZENG Yicheng(School of Physics and Optoelectronic Engineering,Xiangtan University,Xiangtan Hu’nan 411105,China)

机构地区：[1]湘潭大学物理与光电工程学院,湖南湘潭411105

出　　处：《电子器件》2021年第5期1084-1089,共6页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(62071411)。

摘　　要：为了准确有效解决电压比较器阈值电压取值大小问题,改进阈值电压的调节方式,设计了一个以FPGA、AD转换器、DA转换器为核心的电压比较电路。该电路用AD模块对脉冲波形采样,并将采样数据输入到FPGA,FPGA读取波形峰值,然后根据峰值设定阈值电压大小。设定好的阈值电压数值被DA模块以模拟电压的方式输出,从而实现阈值电压的自动设定和调节。实测阀值电压与理论值相比,最大相对偏差为3.778%。结论表明,该电压比较电路实现了阈值电压大小的自动设定和调节,稳定性好,操作便利,具有很好的应用价值。A voltage comparison circuit with FPGA,AD converter and DA converter as the core is designed,in order to accurately and effectively resolve issues with threshold voltage value of the voltage comparator,and to improve the regulation mode of the threshold voltage.The pulse waveform is sampled utilizing AD module,and the sampling data are inputted to FPGA which reads the waveform peak value and then sets the threshold voltage according to the peak value.The set threshold voltage value is outputted by the DA module in the way of analog voltage,so as to achieve the automatic setting and regulation of threshold voltage.The maximum relative deviation is 3.778%between the measured threshold voltage and the theoretical value.The conclusion demonstrates that the voltage comparison circuit realizes the automatic setting and adjustment of the threshold voltage,with excellent stability,convenient operation,and good practical application.

关 键 词：电压比较器 FPGA AD/DA转换 阈值电压 峰值检测 

分 类 号：TM938.42[电气工程—电力电子与电力传动]