基于单片机的直流可调电源的设计毕业论文.doc

长沙航空职业技术学院 题 ???目： 基于单片机的直流可调电源的设计系部名称： ?专业班级： ?电 气班 ?学生姓名：??? 学 ???号：200900012037 指导教师： ?? 教师职称： ?讲 ?师 ??? 2012年 月 2日 摘 要 随着电子技术的迅速发展,直流电源应用非常广泛,其好坏直接影响着电气设备或控制系统的工作性能,目前,市场上各直流电源的基本环节大致相同，主要都包括交流电源、交流变压器(有时可以不用)、整流电路、滤波稳压电路等。因此对稳压直流电源的工作原理的理解非常必要。 本文运用了将单片机控制系统应用于开关稳压电源的方法和原理，提出的开关电源可调稳压输出的观点。认为可以实现开关电源的数控调节，并通过分析稳压工作原理、电压调节方法、AD芯片和单片机的工作原理，使输出电压下实现了0V~18V步进调节并具有“+”、“-”步进调节，最小步进为0.05V。经过调节的电源电压进过A/D转换和单片机处理，用相应的显示设备直观的显示出来，最终得出了直流开关电源在单片机的控制下能够输出稳定的、可调的直流电压的结论。 该可调稳压电源不仅具有开关电源体积小，损耗低，效率高的优点，还具有线性电源输出电压纹波小，输出特性好的优点。并且引入单片机控制，使其在功能上具有一定智能化，能够满足一般低限度场合的供电需要。具有一定的的研究意义及实用价值。 关键字: 稳压电源，单片机，AD芯片 Abstract With the rapid development of electronic technology, the DC power supply is widely used, its quality directly affects the electrical device or control the working performance of the system, at present, the market of the direct current power supply the basic link of roughly the same, mainly includes the AC power, the AC transformer ( sometimes can not), a rectification circuit, a filtering voltage stabilizing circuit. So the regulated DC power supply, the working principle of the understanding is necessary. This paper discusses the application of the single chip microcomputer control system applied in switching power supply method and principle, put forward switching power supply adjustable voltage regulator output point of view. That can realize switching power supply control regulation, and through the analysis of the working principle of voltage, voltage regulation method, A / D chip and the principle, so that the output voltage to achieve 0.1 ~ 15V step regulator. Finally draw the conclusion that the DC switching power supply under the control of single-chip microcomputer can output stable, adjustable DC voltage to the conclusion. The adjustable regulated power supply not only has the switching power supply has the advantages of small volume, low loss, also has the advantages of small output ripple voltage of linear power supply, output characteristics of