同步Buck变换器数字控制研究与实现

发布时间：2018-07-05 09:32

本文选题：开关电源 + 同步Buck　；参考：《东北石油大学》2017年硕士论文

【摘要】：开关电源在工业生产生活中应用广泛,传统的开关电源以模拟控制为主,存在一些缺点和不足。随着数字控制器主频的不断提高、价格的不断下降、以及运算能力的增强,开关电源数字控制成为开关电源发展的新趋势。本文主要研究同步Buck变换器的数字控制技术。首先以同步Buck变换器为研究对象,分析其工作原理,建立数学模型,然后进行仿真分析。仿真工具使用新型电力电子仿真软件StarSim和图形化编程软件LabVIEW,图形化的编程环境可以更直观的展示算法的结构。在算法方面,选择PID算法和极点配置算法。提出了极点配置与积分分离相结合的方法,这样不仅保证了系统具有良好的启动性能,又消除了系统的稳态误差。最后通过仿真实现两种控制算法做对比分析。仿真结果表明极点配置算法在启动、抗电源扰动、抗负载扰动的性能比PID算法更具优势。在仿真分析中,首先详细介绍PID算法和极点配置算法的原理,说明在LabVIEW中如何编写PID算法和通过状态反馈控制实现极点配置。阐述了用LabVIEW实现载波比较、死区时间、纹波计算的方法。为了对算法进一步验证,以STM32为主控芯片,实际制作同步Buck变换器控制样机。分别介绍了控制电路、功率电路、驱动电路、信号调理电路的设计过程和设计要点。重点说明了开关电源PCB设计的过程和设计规范。最后在STM32上实现以上两种算法,给出程序设计流程图。通过实验分别得出两种算法在启动、负载扰动、电源扰动的波形图,其结果与仿真分析一致,验证了仿真分析的正确性,也证明极点配置算法的优越性。
[Abstract]:Switching power supply is widely used in industrial production and life. The traditional switching power supply is based on analog control, which has some shortcomings and shortcomings. With the increasing of the main frequency of the digital controller, the decreasing of the price and the enhancement of the operation ability, the digital control of the switching power supply has become a new trend in the development of the switching power supply. This paper mainly studies the digital control technology of synchronous Buck converter. Firstly, the synchronous Buck converter is studied, its working principle is analyzed, the mathematical model is established, and then the simulation analysis is carried out. The simulation tool uses the new power electronic simulation software StarSim and the graphical programming software LabVIEW. The graphical programming environment can show the structure of the algorithm more intuitively. In the aspect of algorithm, choose pid algorithm and pole assignment algorithm. The method of combining pole assignment with integral separation is proposed, which not only guarantees the system with good startup performance, but also eliminates the steady-state error of the system. Finally, two control algorithms are simulated and compared. The simulation results show that the pole assignment algorithm is better than pid algorithm in the performance of anti-power disturbance and anti-load disturbance. In the simulation analysis, the principle of pid algorithm and pole assignment algorithm are introduced in detail, how to write pid algorithm in LabVIEW and how to realize pole assignment by state feedback control are introduced in detail. The method of carrier comparison, dead time and ripple calculation with LabVIEW is described. In order to further verify the algorithm, the synchronous Buck converter control prototype is made with STM32 as the main control chip. The design process and key points of control circuit, power circuit, drive circuit and signal conditioning circuit are introduced respectively. The process and specification of PCB design for switching power supply are described. Finally, the above two algorithms are implemented on STM 32, and the flow chart of program design is given. The waveforms of the two algorithms in start-up, load disturbance and power supply disturbance are obtained by experiments. The results are in agreement with the simulation analysis, which verifies the correctness of the simulation analysis and proves the superiority of the pole assignment algorithm.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

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