基于DSP的数控电源设计

发布时间：2018-03-11 00:27

本文选题：数字电源　切入点：数字信号处理　出处：《湖南大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着电子科学技术的不断发展，人们对电源的要求日益增高，模拟电路解决方案越来越难以满足要求，数字电源便应运而生。数字电源主要是采用数字的方式来实现电源的智能控制、保护电路和通信接口的新型电源技术。数字信号处理器DSP的发展更加促进了开关电源数字化的进程。文章介绍了DSP作为电源的控制核心，通过控制电源的功率开关管，实现了对输出电压的精确控制。系统由功率因数校正电路、直流转换电路和控制部分电路三部分组成。在介绍功率因数校正电路基本原理的基础上，选择升压型拓扑结构；通过平均电流控制方法，对电路中各元件的参数进行计算和选择，完成元器件的选型；采用电压电流双环控制结构及PI算法，建立了数学模型，实现功率因数校正电路的设计。直流转换电路部分完成了后半部分的DC/DC电路的设计。根据设计的实际需求，在介绍的几种常见经典拓扑结构中选择了一种并对其进行改进，最终确定了包含同步整流结构的具有多路输出双管单端正激结构；在选定变压器、电感等磁性元件基础上，设计了控制部分和驱动电路等外围电路。控制部分采用DSP作为主控制芯片，，主要利用到DSP内部的事件管理器模块和模数转换模块，通过软件编程对电路中的电压电流进行采样，输出合适的PWM波形控制电路中开关管的通断时间以达到调节输出电压的目的。通过搭建实验及检测电路，对各个模块进行了相应的仿真和实验，仿真结果表明电源能实现功率因数校正的作用，最后的输出电压为三路16V，功率能达到500W，证明了方案的可行。
[Abstract]:With the development of electronic science and technology, the demand for power supply is increasing, and analog circuit solutions are becoming more and more difficult to meet the requirements. The digital power supply comes into being. The digital power supply mainly adopts the digital method to realize the intelligent control of the power supply. The development of digital signal processor (DSP) promotes the digitization process of switching power supply. This paper introduces DSP as the control core of power supply, which is controlled by power switch tube of power supply. The accurate control of output voltage is realized. The system consists of three parts: power factor correction circuit, DC converter circuit and control circuit. On the basis of introducing the basic principle of power factor correction circuit, the boost topology is selected, and the average current control method is adopted. The parameters of each component in the circuit are calculated and selected to complete the selection of components, and the mathematical model is established by using the voltage and current double loop control structure and Pi algorithm. The design of the power factor correction circuit is realized. The DC conversion circuit completes the design of the DC/DC circuit in the second half. According to the actual requirements of the design, one of the common classical topologies is selected and improved. Finally, the multi-channel output double-transistor single-terminal forward structure with synchronous rectifier structure is determined. Based on the selection of magnetic elements such as transformer, inductor, etc. In the control part, DSP is used as the main control chip, which is mainly used in the event manager module and analog-to-digital conversion module of DSP, and the voltage and current in the circuit are sampled by software programming. The switching time of the switch in the PWM waveform control circuit can be adjusted to adjust the output voltage. The simulation results show that the power supply can realize the function of power factor correction. The final output voltage is three channels 16V and the power can reach 500W, which proves the feasibility of the scheme.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

【引证文献】