有源滤波器MAX274在电力参数测量中的应用

Application of Active Filter MAX274 in the Measuring of Electric Power Parameters

针对基于DSP的电力参数测量装置中采用普通硬件实现低通滤波器存在的问题,提出了采用MAXIM公司有源滤波芯片MAX274设计低通滤波器的方法。详细介绍了装置中模拟信号调理电路的组成和工作过程。通过介绍MAX274的性能特征和内部结构,详细地叙述了采用MAX274设计低通滤波器的过程。认真分析设计效果图证实该滤波器达到了实际的应用要求,提高了电力参数测量装置的实时性、精确性和稳定性。

Contraposing the problem of low-pass filter which adopts general hardware in the electric power parameters measuring device based on DSP, the method of designing low-pass filter which adopts active filter MAX274 of MAXIM Company was introduced. The makeup and work process of analog signal conditioning circuit in the device were detailed. By introducing the performance character and internal structure of MAX274, the process of designing low-pass filter which adopts active filter MAX274 were also detailed. By analyzing the designing effect graph seriously, this filter achieves factual application requirement and improves real-time quality, accuracy and stabilization of electric power parameters measuring device.