基于PID调节器的Buck电路的系统设计与仿真

System Design and Simulation of Buck Circuit Based on PID Regulator

PID控制是最早发展起来的控制策略之一,由于其算法简单、鲁棒性好和可靠性高,被广泛应用于工业过程控制。尤其是适用于可建立精确数学模型的确定性控制系统[1]。一般的DC/DC变换器是一种非线性系统,单一的控制策略往往不能满足系统动态和静态指标的要求,因此需要加上一个负反馈构成一个闭环系统来提高输出精度和动态特性。针对这种情况,本文设计了一个PID调节器,并与Buck电路构成一个负反馈系统。通过小信号建模,得出Buck变换器的数学模型,并通过Matlab软件中sisotool工具模块仿真并设计出PID调节器的参数,极大地改善了DC-DC变换器系统的动态特性。

ABSTRACT:PID control is one of the earliest developed control strategy, because of its simple algorithm, good robust-ness and high reliability, is widely used in industrial process control. Especially, it is suitable for the deterministic control system which can establish the precise mathematical model. DC / DC converter is a nonlinear system, a single control strategy often fails to meet the requirements of the system dynamic and static performance. Therefore, , adding a negative feedback to consti-tute a closed-loop system to improve the output precision and dynamic characteristic is necessary. In view of this situation, this paper designs a PID regulator, and constitute a negative feedback system with Buck circuit. Getting the mathematical model of the buck converter by the small signal modeling, and Designing the parameters of the PID regulator through MATLAB software SISOTOOL tool module, greatly improve the dynamic characteristics of the DC-DC converter system.