【正文】 穩(wěn)壓電源功能簡單、難控制、可靠性低、干擾大、精度低且體積大、復(fù)雜度高 、效率低 。 關(guān)鍵字 : 穩(wěn)壓電源，單片機(jī)， AD 芯片 長沙航空職業(yè)技術(shù)學(xué)院 3 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 microputer 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 ~ 15V step regulator. Finally draw the conclusion that the DC switching power supply under the control of singlechip microputer 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 good advantages. And the introduction of SCM control, its function has certain intelligence, can satisfy the general low limit the power needs of occasions. Has certain research value and practical significance. Keywords: Regulated Power Supply SCM A/D Chip 長沙航空職業(yè)技術(shù)學(xué)院 4 目錄 摘 要 ............................................................. 2 Abstract .......................................................... 3 目錄 .............................................................. 4 第 1 章 緒論 ..................................................... 6 穩(wěn)壓電源的發(fā)展和現(xiàn)狀 .................................................... 6 線性穩(wěn)壓電源 ....................................................... 6 開關(guān)穩(wěn)壓電源 ....................................................... 7 穩(wěn)壓電源的應(yīng)用 .......................................................... 7 第 2 章 電源設(shè)計(jì)方案論證 .......................................... 9 設(shè)計(jì)方案的分析 .......................................................... 9 方案一采用分立元件 ................................................. 9 方案二采用單片機(jī)為控制核心 ........................................ 10 方案選擇 ............................................................. 11 第 3 章 電源系統(tǒng)硬件介紹 ......................................... 12 AT89S52 單片機(jī)的介紹 .................................................. 12 主要性能 .......................................................... 13 功能引腳說明 ...................................................... 13 控制或與其他電源復(fù)用引腳 RST， ALE,VPP ............................. 13 輸入 /輸出引腳 ..................................................... 14 AT89S52 內(nèi)部電路框圖 .............................................. 15 數(shù)碼管顯示 ........................................................... 16 數(shù)碼管結(jié)構(gòu)及原理 ................................................ 16 數(shù)碼管顯示方式 .................................................. 18 TLC1543AD 轉(zhuǎn)換芯片 .................................................... 19 TLC1543 芯片的工作時(shí)序 .......................................... 20 TLC1543 的軟硬設(shè)計(jì)要點(diǎn) ........................................ 21 TLC1543 芯片的應(yīng)用 .............................................. 22 TIP41 芯片 .............................................................. 22 DAC0832 轉(zhuǎn)換芯片 ........................................................ 23 DAC0832 引腳功能說明 .............................................. 23 D/A 轉(zhuǎn)換原理 ..................................................... 25 D/A 轉(zhuǎn)換器性能參數(shù) ............................................... 28 DAC0832 的工作方式 ................................................ 29 第 4 章 電源硬件電路設(shè)計(jì) ......................................... 30 硬件電路的總體結(jié)構(gòu) ...................................................... 30 主機(jī)電路設(shè)計(jì) ............................................................ 31 長沙航空職業(yè)技術(shù)學(xué)院 5 系統(tǒng)電源模塊硬件電路設(shè)計(jì) ............................................. 32 系統(tǒng)供電模塊電路設(shè)計(jì) .............................................. 32 電壓調(diào)整模塊 ...................................................... 34 D／ A轉(zhuǎn)換模塊 ........................................................... 35 A/D 模數(shù)轉(zhuǎn)換電路 ...................................................... 36 鍵盤電路設(shè)計(jì) ........................................................... 37 數(shù)碼管顯示電路 .......................................................... 38 74LS373 芯片 ...................................................... 38 74ls138 芯片 ...................................................... 39 串行通信接口電路 ........................................................ 40 復(fù)位電路 ................................................................ 41 時(shí)鐘電路 .............................................................. 42 硬件電路 PCB 圖 ........................................................ 42 硬件扛干擾措施 ......................................................... 43 第 5 章 電路軟件設(shè)計(jì) ............................................. 44 第 6 章 電路板的焊接及調(diào)試 ........................................ 45 電路板的焊接 ............................................................ 45 電路板的調(diào)試 ............................................................ 45 結(jié) 論 ............................................................ 47 參考文獻(xiàn) ......................................................... 48 致 謝 ............................................................ 49 附錄一 系統(tǒng)原理圖 ................................................. 50 附錄 2 程序源代碼 ............................