【正文】 本 科 畢 業(yè) 設(shè) 計(jì)題目 ：數(shù)控可調(diào)穩(wěn)壓電源的設(shè)計(jì) 摘 要隨著電源技術(shù)的不斷發(fā)展，數(shù)控可調(diào)穩(wěn)壓電源成為電源研究領(lǐng)域的熱門對(duì)象，其突出特點(diǎn)是數(shù)控特性，數(shù)控特性體現(xiàn)在以單片機(jī)為核心實(shí)現(xiàn)對(duì)電源的輸出電壓的控制。本設(shè)計(jì)使用的單片機(jī)芯片為 89C51。先通過鍵盤輸入數(shù)字電壓，再將電壓數(shù)值顯示在數(shù)碼管上，最后通過數(shù)/模轉(zhuǎn)換得到模擬輸出電壓。本文主要探討了數(shù)控可調(diào)穩(wěn)壓電源的設(shè)計(jì)方法。首先，簡(jiǎn)單介紹了數(shù)控可調(diào)穩(wěn)壓電源的選題背景，全面總結(jié)了數(shù)控電源的概念、特性以及設(shè)計(jì)思路等方面的問題。其次，系統(tǒng)介紹了數(shù)控可調(diào)穩(wěn)壓電源的設(shè)計(jì)方法。本文所討論的數(shù)控可調(diào)穩(wěn)壓電源的設(shè)計(jì)共包括兩個(gè)部分的設(shè)計(jì)：硬件電路設(shè)計(jì)和軟件系統(tǒng)的設(shè)計(jì)。硬件部分包括：數(shù)字顯示電路、鍵盤電路、單片機(jī)電路、數(shù)字/模擬轉(zhuǎn)換電路、模擬信號(hào)放大電路以及輸出電流過流保護(hù)電路的設(shè)計(jì)。軟件部分包括：?jiǎn)纹瑱C(jī)的初始化以及各模塊的執(zhí)行程序。其中初始化包括：調(diào)整堆棧指針、需要使用的內(nèi)部數(shù)據(jù)存儲(chǔ)器的初始化、設(shè)置數(shù)控電源的開機(jī)輸出電壓以及 CPU 中斷部分設(shè)置。接著，將軟件和硬件相結(jié)合，從總體上實(shí)現(xiàn)數(shù)控電源的位選、數(shù)值調(diào)整等特性。最后，對(duì)設(shè)計(jì)結(jié)果做了整體地概述和分析。包括設(shè)計(jì)中遇到的問題、元器件的選擇和個(gè)人體會(huì)等。關(guān)鍵詞：數(shù)控可調(diào)穩(wěn)壓電源；單片機(jī)；數(shù)字顯示；位選擇；數(shù)值調(diào)整 IAbstractWith the power technical progress, NC adjustable power supply power have bee the most popular object of research areas, the prominent feature of the NC is NC embodied in the microcontroller as the core to achieve the power output voltage design of the microcontroller chip for the 89 C51. first, Through digital keyboard input voltage, and then voltage values in the digital display on the final through D / A converters are analog output voltage. This article on the NC adjustable power supply design.Firstly, the NC adjustable power supply of choice to do a simple background briefing, a prehensive summary of the NC concept of power, features and design ideas, and other aspects.Secondly, the NC adjustable power supply design to the system introduced. This paper presented by the NC adjustable power supply design, including a total of two parts of the design: hardware circuit design and software systems design. Hardware, including: the power supply design, figures show circuit, keyboard circuit, SCM circuits, digital / analog converter circuit, analog amplifier and the output current overcurrent protection circuit. Software includes: MCS module initialization and the implementation procedures. Initialized which include: adjusted stack pointer, the need to use the internal data memory of the initialization, set up the boot NC power output voltage and CPU interruption of the set.In succession, that is software and hardware integration, the overall realization of the power of the NC digital election, numerical adjustments characteristics.Finally, the results do the overall design overview and analysis. This includes some of the problems encountered in the design, the choice of ponents and personal experience and so on.Key words: NC adjustable power supply。 SCM。 figures show。 digital Choice。 numerical adjustment II目 錄1 緒論 .......................................................................................................................................1 簡(jiǎn)介 .................................................................................................................................1 論文選題背景 .................................................................................................................1 論文研究?jī)?nèi)容及結(jié)構(gòu) .....................................................................................................2 論文研究的主要內(nèi)容 ..............................................................................................2 論文結(jié)構(gòu) ..................................................................................................................22 系統(tǒng)電源的設(shè)計(jì) ...................................................................................................................4 穩(wěn)壓電源的基本原理 .....................................................................................................4 穩(wěn)壓電源的原理圖 .........................................................................................................5 紋波處理 .........................................................................................................................5 紋波的概念 ..............................................................................................................6 紋波的害處 ..............................................................................................................6 紋波電壓的抑制方法 ..............................................................................................63 硬件電路設(shè)計(jì) .......................................................................................................................7 硬件系統(tǒng)結(jié)構(gòu)框架 .........................................................................................................7 單片機(jī)發(fā)展和組成 .........................................................................................................7 單片機(jī)的組成 ..........................................................................................................8 89C51 單片機(jī)的引腳描述及片外總線結(jié)構(gòu) ..........................................................9 譯碼顯示電路 ...............................................................................................................11 輸入、輸出接口 P0～P3 ......................................................................................11 并行輸入/輸出口概述 ...........................................................................................11 串行輸入/輸出口概述 ...........................................................................................11 數(shù)碼管 ....................................................................................................................13 基于串行輸入/輸出口的數(shù)碼管電路 ...................................................................14 數(shù)字/模擬轉(zhuǎn)換電路 ......................................................................................................16 DAC0832 數(shù)字/模擬轉(zhuǎn)換器的應(yīng)用 .....................................................................16 DAC0832 數(shù)字/模擬轉(zhuǎn)換器的介紹 .....................................................................16 III 鍵盤電路 .......................................................................................................................19 中斷系統(tǒng)介紹 ........................................................................................................19 鍵盤電路 ..........................................................................................