基于SIMULINK的BUCK型变换器复合控制研究

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Researchon Composite Control ofBUCKConverterBased on SIMULINK

JIANG Jinjin ZHANG Yajie （Anhui Water Conservancy Technical College，Hefei 231603， China）

Abstract： [Purposes] The buck chopper （BUCK circuit） is widely used，but its output voltage has a steady-state error during open-loop operation，which makes it dificult to meet practical application requirements.Therefore，simulation research is necessary to improve its performance.[Methods] Based on the principle of PWMclosed-loop negative feedback PID control，a simulation model was established using SIMULINK.A closed-loop negative feedback control strategy was introduced into the circuit to perform closed-loop regulation of the output voltage，which can eliminate the steady-state error，but its dynamic response is not fast enough. Therefore，composite control combining open-loop and closed-loop was considered，aiming to both eliminate the steady-state error and accelerate the dynamic response. [Findings] Through the design of the simulation model and the tuning of verification parameters，the results show that the composite control combining open-loop and closed-loop can effectively eliminate the steady-state error of the output voltage of the BUCK circuit and meet the system's requirement for a fast dynamic response.[Conclusions] By using SIMULINK simulation to quickly adjust parameters and conduct repeated experiments，complex real-world scenarios were simulated at extremely low cost and risk， greatly enhancing the flexibility and efficiency of engineering experiments.

Keywords：SIMULINK simulation; BUCK circuit; PWM; closed-loop negative feedback; composite control; PID control

0 引言

直流-直流变换电路，也称DC/DC变换器[]，是将幅值固定的直流电压（或电流）变换成幅值和极性都可变的电路，常用于构成直流脉冲调速电压和开关稳压电源。（剩余2670字）