基于真有效值法测量交流电压信号有效值的仿真研究

The Simulation Research of the Valid Value Measurement of AC Voltage Signal Based on TRMS Method

本文通过对真有效值法的数学定义式进行恒等变形,利用变形后的定义式搭建了以精密整流电路、对数运算电路和指数运算电路构成的自反馈式模拟电路,实现测量交流电压有效值的目的。基于Multisim仿真软件搭建仿真电路,对50Hz^50k Hz的交流电压信号以及畸变电压信号进行测量,经仿真测量最大误差维持在0.1%~0.3%,证明可行性和准确性。

Based on the identical deformation of the TRMS definition,the issue proposes that a new analog feedback circuit to measure the valid value of the AC voltage.The feedback circuit is consisted of the precision rectifier circuit,the exponential arithmetic circuit and the logarithmic arithmetic circuit.According to measuring 50 Hz ~ 50 k Hz AC voltage signal and the distortion of voltage by building the simulation with Multisim,the feasibility and accuracy of the circuit are proved with the maximum deviation at 0.1% to 0.3%.