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众所周知,电压—频率变换器(V/F 变换器)在测量和控制系统中是一种用途很广的功能电路。只要被测物理量,诸如:压力、温度、应力、扭矩,位移、角度等,变成电压信号之后,它都可以很方便地将它们变换成频率信号输出。特别是在遥测系统和旋转部件信息的引电系统中,它具更大的意义。对于电压—频率变换电路本身的要求是利用廉价元件、简单电路来实现高精度的V/F 变换。众所周知,利用闭环反馈原理,即利用反馈回路的增并来改善V—F 变换器的线性度和稳定度是行之有效的方法。系统原理方框图如图1所示。
As we all know, voltage-frequency converter (V / F converter) in the measurement and control system is a versatile function circuit. As long as the measured physical quantities, such as pressure, temperature, stress, torque, displacement, angle, etc., become voltage signals, they can easily be converted into frequency signal output. Especially in the telemetry system and rotating parts of the information of the system, it is more significant. The requirement of the voltage-frequency conversion circuit itself is to use a low-cost component and a simple circuit to achieve high-precision V / F conversion. As we all know, the use of closed-loop feedback principle, that is, the use of feedback loop to improve the linearity and stability of the V-F converter is an effective method. System principle block diagram shown in Figure 1.