基于比例积分控制器的恒定相移低通滤波电路  

Low-pass Circuit of Constant Phase Shift Based on Proportional Integral Controller

作　　者：王帅[1,2] 刘文怡[1,2] 王红亮[1,2] 符多铎[1,2] 

机构地区：[1]中北大学电子测试技术国家重点实验室,山西太原030051 [2]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051

出　　处：《探测与控制学报》2013年第5期69-73,共5页Journal of Detection & Control

基　　金：国家自然科学基金项目资助(61004127)

摘　　要：在硬件电路中,低通滤波器在滤波的同时使输入信号产生非线性相位偏移。针对这个问题,提出基于比例积分控制器的恒定相移低通滤波电路。该电路利用低通滤波器与比例积分控制器级联,设置低通滤波器的极点值等于比例积分控制器积分时间常数的倒数,且低通滤波器的阶数与比例积分控制器的个数相同,从而使信号经过低通滤波器与比例积分控制器的相位偏移的和为恒定值。理论分析与仿真表明,与全通滤波器和零相移滤波器实现线性相移或恒定相移相比,提出的电路计算简单,误差较小,并且容易实现。The low-pass filter could make the input signal suffer nonlinear phase shift while it is working in the hardware circuit. To solve the problem, this paper presented a low-pass circuit of constant phase shift based on proportional integral controller, which was achieved by cascade of low-pass filter and proportional integral con- troller, pole value of low-pass filter was set equal to the reciprocal of proportional integral controller integral time constant, and the orders of low-pass filter was the same as the number of proportional integral controllers, when the signal passes through the filter and the controller, phase shift of which was equal to constant value. Result of theoretical analysis and simulation showed that the circuit was of less calculation amount, less error and easier to implement, compared with the all-pass filter and zero-phase-shift filter, the circuit achieved a con- stant linear phase shift or constant phase shift.

关 键 词：电路 滤波 低通 相移 

分 类 号：TP11[自动化与计算机技术—控制理论与控制工程]