Buck变换器MATLAB仿真控制研究

MATLAB Simulation Control of Buck Converter

Buck变换器原理简单、应用广泛,但开环控制输出电压易受负载和电源电压的影响,导致输出不稳定.给出了一种闭环设计的方案:采用超前-滞后校正,利用MATLAB软件中的sisotool工具进行Bode图校正,通过Bode图计算出合理稳定的补偿函数.利用所求得的补偿函数进行闭环仿真,输出电压稳定精确,符合预期结果.

Buck converter is simple in principle and widely used in application.However,the output voltage of open-loop control is easily affected by load and power supply voltage,which can easily lead to unstable output.In this paper,a closed-loop design scheme is presented:with lead-lag revision and sisotool in MATLAB,the Bode diagram is corrected,through which the reasonable and stable compensation functions are worked out.The output voltage of the closed loop simulation is stable and accurate,which is in line with the expected result.