基于单片机数字直流电流源设计.doc

毕 业 设 计 [论 文] 题 目：基于单片机的数字直流电流源设计 学 院：电气与信息工程学院 专 业：电子信息工程 摘 要 由于现代科技发展的日新月异，它极大地促进了社会的不断向前发展，而且为高端电子设备的研发提供了新的技术支持。同时，电源充当这些设备的食粮，众所周知，不同的电子元件和线路对电源的大小要求是不同的，所以，我们对其的探索仍是十分的迫切。近些年基于单片机的各种器件的兴起，为数控恒定电流源的研究与开发指明了发展方向。 本文系统的介绍了以STC89C52单片机为中心控制器数控电流源的设计方法，并运用仿真软件如Proteus进行了仿真。利用按键设置输出电流，单片机将该电流值送1602液晶屏显示，同时， DAC TLC5615把数字量转换由运算放大器输出的模拟电压值，它作为参考电压控制晶体管电流的输出，又有限制电路输入输出的作用。该数控电流源是基于单片机设计的，因此精确度很高，体积小，功耗低等优点。 关键词：电流源；STC89C52；LCD显示；Proteus；TLC5615 Summary Due to the rapid development of modern technology, which greatly promoted the continuous development of society, but also for the development of high-end electronic equipment provides a new technical support. At the same time, serve as a food supply for these devices is well known, different electronic components and circuit size of the power supply requirements are different, so we explore it remains very urgent. In recent years the rise of a variety of devices based on single-chip microcomputer, as the research and development of numerical control constant current source pointed out the development direction. System in this paper are introduced the STC89C52 microcontroller as the center controller design method of numerical control current source, and has carried on the simulation using the simulation software such as Proteus. Using the current value Settings output current, MCU send 1602 LCD screen display, at the same time, with TLC5615 d/a converter to convert digital to analog, the output reference voltage, through the op-amp TLC5615 This article describes the system as a central controller to STC89C52 microcontroller digitally controlled current source design methods and the use of simulation software such as Proteus simulation. Use buttons to set the output current, the current value is sent to the microcontroller 1602 LCD screen display, while, DAC TLC5615 analog to digital converter output voltage from the operational amplifier, which is used as a reference voltage