基于180度迭代的有限相角集无PI锁相环

Finite Phase Angle Set PI-less Phase Locked Loop Based on 180 Degrees Iteration

针对常规锁相环需要设计比例积分(PI)控制器的问题,提出了一种改进的基于180度迭代的有限相角集无PI锁相环。首先,分析了常规锁相环存在的问题;其次,提出了一种新的目标函数设计方法,由于该目标函数在180度范围内具有唯一的最大点,可以通过在180度内寻优得到最优角度,从而缩小了相角迭代范围;然后,提出了一种改进的迭代方法,可以用更少的迭代次数获得和常规方法相同的相角迭代精度,从而减少了计算量;最后,通过对比试验验证了所提迭代锁相环的有效性。

To solve the problem of designing proportional integral(PI)controller for conventional phase locked loop,an improved finite phase angle set PI-less phase locked loop based on 180 degrees iteration is proposed.Firstly,the problems existing in the conventional phase locked loop are analyzed.Secondly,a new cost function design method is proposed.Since the cost function has a unique maximum point within the range of 180 degrees,the optimal phase angle can be searched within this range,reducing the phase angle iteration range.Then,an improved iteration method is proposed,which can obtain the same phase angle iteration accuracy as the conventional method with fewer iteration times,thus reducing the amount of computation.Finally,the effectiveness of the proposed iterative phase locked loop is verified bycomparativetests.