数控直流电流源设计 毕业设计 毕业论文及文献综述.doc

摘 要 随着电子技术的不断进步，对电子仪器的要求也不断提高。电源作为电路的动力源泉更是扮演着越来越重要的角色，不论是学校实验室还是维修中心都离不开实验电流源，然而传统的电流源不论是在控制精度还是输出特性上都无法满足要求。 随着单片机技术的不断发展和D/A，A/D技术的不断成熟使得数控电源成为可能，数控电流源不论是在控制精度还是在可操作性上都有传统电源无法比拟的优势。 本文在参考传统电流源以及普通数控电流源的基础上，在充分考虑性价比的同时极大地提高了数控电流源的准确性，本硬件设计是以AT89C52为核心部件，由键盘输入模块、显示模块、数模（D/A）转换模块、 电源模块、恒流源模块及单片机主控部分等几个模块组成。通过软件修正以后在使用普通元件的情况下数控电流源的性能也达到了比较高的水平。 关键字：高精度； DAC0832； D/A转换； 恒流源；  Abstract Progress unremittingly the request to the electronics instrument technically to also raise continuously along with the electronics, the power supply is the motive source of the electric circuit to play a more and more important role more, is the school a laboratory still repair centerses to all can not get away from an experiment power supply in spite of, however the traditional power supply is control accuracy or output the tops of the characteristic in spite of and can't satisfy a request. Along with single slice machine technical of develop continuously with the D/A, the A/D is technical continuously the maturity make the number control power supply to make possible, count to control the electric current source and is control accuracy in spite of still on the maneuverability all there is traditional power supply can't compare to of advantage. This text in making reference to the foundation that the traditional electric current source and common number control the electric current source, at the full consideration price compare of in the meantime raised a number to control the accuracy of the electric current source biggest. This hardware design is take AT89C52 as the core part, by the keyboard entry module, the display module, the digital-analog (D/A) transforms the module, the power source module, the constant current module and the monolithic integrated circuit master control part and so on several modules is composed. Pass the software correction hereafter while use the circumstance of the common component the number controls the electric current source of the function also c