基于555定时器的V/F转换电路分析与应用

Analysis and Application of V/F-converter Circuit Based on 555 Timer

该文介绍一款由555定时器和差分式积分电路构成的V/F(电压/频率)转换电路。在分析电路工作时序的基础上,建立电容充放电的数学模型计算各个关键参数。最后以实际的Pt100温度采集卡电路为例,验证参数以及电路整体性能。

This paper introduces an circuit by the 555 timer and a differential integration unit,which is used to convert voltage to frequency.Make the mathematic model of charge-discharge capacitance to calculate each key parameter after analying the circuit＇s sequence.Finally,take an circuit of temperature acquisition based on Pt100 as an example to check these parameters and the circuit＇s performance.