基于ARM的单级PFC恒流源研究

发布时间：2018-02-15 05:01

本文关键词： 高功率因数反激变换器智能化模糊PID　出处：《西安科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：大功率的LED多应用于航海、军事、广场照明、农业大棚照明等领域。其驱动电源性能的优劣,直接影响到LED的发光效果,以及工作的可靠性与稳定性。因此,研究开发高功率因数、高效率、智能化、长寿命的驱动电源意义重大。数字控制驱动电源的优势在于能够通过编写软件,从而改进或改变控制策略。另外,数化控制能够简化系统的硬件电路,使得电源的制造成本大幅降低,同时也可以减小电路受硬件老化而带来的影响。更重要的是,数字控制能够实现高精度控制,在提高系统性能的同时,可以使得驱动电源更加智能化。设计以STM32F103RCT6为主控制器,反激变换器为主拓扑结构,并基于模糊PID的控制策略,设计了模糊规则表。从优化电源效率,提高电源功率因数,提升电源工作的可靠性与稳定性,以及使得驱动电源的控制方式更加智能化等多方面因素综合考虑,设计了一种基于模糊PID控制的单级PFC恒流源。在Matlab/Simulink环境中建立了基于模糊PID控制的系统模型,并对其进行了仿真,仿真结果验证了控制策略的可行性以及系统工作的稳定性与可靠性。在此基础之上,以STM32作为主控制器,对输出电压、输入电压以及输入电流进行采样,将采样值输入STM32控制器,控制器通过程序的运算处理,产生相应的PWM波形,控制开关管的导通与关断,从而实现电源的恒流输出以及功率因数的校正。最终在实际试验中测得的实验数据表明,对恒流源的理论分析正确,控制策略也是可行的,并且系统性能指标能够达到设计的要求。
[Abstract]:High-power LED is widely used in navigation, military, square lighting, agricultural greenhouse lighting and other fields. The performance of its driving power directly affects the luminous effect of LED, as well as the reliability and stability of work. The research and development of high power factor, high efficiency, intelligent, long life driving power supply is of great significance. The advantage of digital control drive power supply lies in the ability to improve or change control strategy by writing software. Digital control can simplify the hardware circuit of the system, greatly reduce the manufacturing cost of the power supply, and reduce the influence of the hardware aging on the circuit. More importantly, the digital control can achieve high precision control. While improving the performance of the system, the drive power supply can be more intelligentized. In this paper, STM32F103RCT6 is used as the main controller and flyback converter is the main topology. Based on the fuzzy PID control strategy, the fuzzy rule table is designed to optimize the power supply efficiency. To improve the power factor of power supply, improve the reliability and stability of power supply, and make the control mode of driving power more intelligent and so on, A single stage PFC constant current source based on fuzzy PID control is designed. The system model based on fuzzy PID control in Matlab/Simulink environment is established and simulated. The simulation results verify the feasibility of the control strategy and the stability and reliability of the system. On this basis, the output voltage, input voltage and input current are sampled with STM32 as the main controller. The sampling value is input into the STM32 controller. The controller generates the corresponding PWM waveform through the calculation and processing of the program, and controls the switch on and off. Thus, the constant current output of the power supply and the correction of the power factor are realized. Finally, the experimental data measured in the actual experiment show that the theoretical analysis of the constant current source is correct, and the control strategy is also feasible. And the system performance index can meet the design requirements.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM46

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