采用时分割乘法器的电能测量系统

Time-division multiplier-based electric power measuring system

针对当前电能参数测量系统精度低、受器件和温度影响较大的现状,采用时分割乘法器设计了电能参数测量系统。该系统主要由时分割乘法器、低通滤波器、电压频率转换器组成,能够完成电流、电压真有效值以及无功功率、有功功率、视在功率、功率因数等的测量和显示。误差分析表明:该系统对有功功率的测量精度可达0.1级,其测量范围广且设计灵活,适合于设计高精确度、高准确度的电能测量仪器。

This paper is an effort to remove the negative features of currently used electric power measurement, such as the lower accuracy and more vulnerability to components and temperature by developing an electric power paramerter measurement system, using time-division multiplier. The system designed with three modules, the time-division multiplier, low pass filter and voltage to frequency converter allows the measurement and display of rms current and rms voltage, along with the calculation and display of reactive power, active power, apparent power and power factor. Error analysis shows that the system with active power measurement precision of 0. 1% offers a wider measuring range and more flexible design, lending itself better to the design of power-detecting instrument of higher accuracy.