毕业设计压缩稿.doc

简易数控直流电源的设计 盐城工学院本科生优秀毕业设计选编 PAGE 4 PAGE 1 简易数控直流电源的设计 电气工程及其自动化0661402103彭亚颖 成开友 摘 要 简述了电源系统的发展历史及国内外研究概况，确定了简易数控直流电源系统设计方案，阐述了简易数控直流电源系统的构成及控制原理。设计分硬件和软件两部分，硬件部分包括数控直流电源系统的数控部分、键盘/显示器接口电路、功率放大电路及辅助电源的设计，整个系统可编程，使得系统灵活性大大的增加了。系统以8031单片机为核心，通过电源面板键盘对电压值的预置和步进调节实现独立工作；电源的输出部分也不再采用传统的调整管方式，而是在D/A转换之后，经过稳定的功率放大而得到；采用三位半的数字电压表（DVM）直接对输出电压进行采样并显示输出实际电压值，一旦系统工作异常，出现预置值与输出值偏差过大，用户可以根据该信息予以处理。软件采用汇编语言编写，应用模块化设计思想。设计的数控直流电源不仅输出可调、步进精确、纹波电流极小，而且可将输出电压预置、实测值及预置值在LED上同时显示。因此系统具有通用性好、可靠性高、线路简单、步进精度高、显示直观、使用方便等优点，有较高的性价比。经过论证表明，该系统设计合理，性能可靠。 关键词：数字控制；D/A转换；步进；单片机 Simply tells the development history and the survey of researches at home and abroad about the system of power source, ascertain the designing scheme of the unsophisticated numerical control direct power source system and expounds the tenet of component and control of unsophisticated numerical control direct power source system. The design includes hardware and software parts, The hardware part introduces the numerical control part of numerical control direct power system, keyboard/the joint circuit of electron kinescope, power-manifested circuit and the design of supplementary power .the whole system can be programmed and make more flexibility. The system takes 8031monolithic integrated circuit as a core and achieves independent work through the power source kneading board keyboard to the voltage value initialization and step-by-step adjustment; The output units of power source no longer adopt traditional regulation tube way, but obtain after the transformations of D/A and passing through the stable power to enlarge; It adopts three and a half number DVM to do samplings about output power directly and shows actual result of power. If system works unexpectedly and the result of output is much larger than measured results, the users can deal this based upon this information. The software uses assembly language compilation and the application modulation designing thoughts That designed digital-control direct-current po