摘要
为解决现有交流电压幅值测量方法中对模数转换器性能要求高、硬件电路复杂的问题,采用电压/频率转换器将交流电压幅度信息调制成数字频率信号,通过分析数字频率信号,可计算出调制前的交流电压幅值。推导出变换周期内电压/频率转换器的输出频率与输入交流电压幅值的数学关系;在此基础上设计出仅含有电压/频率转换芯片和一片双运放的交流电压幅值检测电路。实验结果表明,该方法正确,电路设计合理有效。该方法利用数字频率信号易积分特性,将每个测试值均用于计算待测信号的幅度,提高了测试数据的利用率,且简洁的电路设计提高了测量的稳定性。
In order to solve the problems of high performance requirements and complex hardware circuits in existing AC(Alternating Current)voltage amplitude measurement methods.A voltage/frequency converter is used to modulate AC voltage amplitude information into a digital frequency signal.By analyzing the digital frequency signal,the AC voltage amplitude before modulation can be calculated.The mathematical relationship between the output frequency of the voltage-frequency converter and the input AC voltage amplitude during the conversion period is deduced in detail.An AC voltage amplitude detection circuit is designed which contains only a voltage/frequency converter chip and a double operational amplifier.The experiment results show that the method is correct and the circuit design is reasonable and effective.The method utilizes the easy integration characteristics of digital frequency signals,and each test value is used to calculate the amplitude of the signal to be measured.The simple circuit design reduces the design cost and improves the measurement stability.
作者
王睿
王菲
张宗达
杨罕
WANG Rui;WANG Fei;ZHANG Zongda;YANG Han(College of Electronic Science and Engineering,Jilin University,Changchun 130012,China)
出处
《吉林大学学报（信息科学版）》
CAS
2020年第3期308-311,共4页
Journal of Jilin University（Information Science Edition）
基金
吉林大学本科教学改革研究基金资助项目(2019XYB209)。
关键词
电压/频率转换
模数转换
积分
voltage-to-frequency conversion
analog-digital conversion
integration
