基于AT89C51單片機的電源切換控制器的設計

電子機電論文編號:JD549 附外文翻譯,開題報告.原理圖,論文字數:17556,頁數:36

目   錄

1  引言……………………………………………………………………………………1
1.1  電源切換器簡介……………………………………………………………………1
1.2  開關電源的應用……………………………………………………………………1
1.3  國內外發展狀況……………………………………………………………………2
1.4  課題要求……………………………………………………………………………3
2  硬件部分………………………………………………………………………………4
2.1  硬件原理圖的總體設計……………………………………………………………4
2.2  光電耦合器…………………………………………………………………………4
2.3  ADC0809模數轉換器………………………………………………………………7
2.4  AT89C51單片機………………………………………………………………… 10
2.5  74LS373………………………………………………………………………… 15
2.6  8255A接口電路………………………………………………………………… 16
2.7  保護電路設計…………………………………………………………………… 18
2.8  聲光報警電路…………………………………………………………………… 19
2.9  繼電器…………………………………………………………………………… 20
2.10 直流電源……………………………………………………………………………25
3  軟件設計…………………………………………………………………………… 27
3.1  主程序流程圖…………………………………………………………………… 27
3.2  A/D轉換………………………………………………………………………… 27
結論 ………………………………………………………………………………………29
致謝 ………………………………………………………………………………………30
參考文獻………………………………………………………………………………… 31
附錄A  程序清單……………………………………………………………………… 33
附錄B  硬件電路圖 ……………………………………………………………………36

摘要
該設計介紹了用AT89C51單片機構成的電源切換系統。它是一種能在電源之間進行自動切換的裝置，以保證某路正在使用的電源在出現故障時能自動切換到另外的正常電源上，保證供電不間斷或間斷時間在允許的范圍內。該電源切換裝置必須具有反應靈敏、工作可靠、功能齊全、聲光指示等特點。本設計包括硬件電路的設計及分析，以及軟件程序的編程及其分析，主要實現對常用電源和備用電源的自動切換。首先通過ADC0809將采集的模擬信號進行模數轉換后輸入單片機。單片機根據控制要求將輸入信號與預設標準信號進行對比，如果采樣信號與預設信號不符，單片機控制繼電器進行電源切換，同時發光二極管和揚聲器工作，發出聲光報警。本系統成本低、可靠性高、工作模式多、對工作環境沒有特殊要求，具有重要的現實意義。

關鍵詞  電源切換  不間斷電源  聲光報警

Title  the design of power switching controller based on AT89C51 single-chip microcomputer                                         

Abstract 
The design introduces a switching power supply system constituted by AT89C51 single chip microcomputer. It is a device that can automatically switch between different power supplys, to guarantee a certain way could automatically switch to another normal power in the event of failure, guaranteeing uninterrupted power supply or droped time with in the extent of permitted. The power switching devices must be responsive, reliable, multifunctional and acousto-optic characteristics. The design includes hardware circuit design and analysis, and software programming and analysis to switch automatically between main power and substitute power. Connection between ADC 0809 will be the first acquisition by the analog signal for analog-to-digital conversion after importation of SCM. SCM under control requires the input signal and the default standard signal contrast, If the sampling signal was inconsistent with the predetermined signal, the single chip will control relays for switching power supply. Meanwhile LEDs and   loudspeakers work, sound and light warning issued . The low cost, high reliability, multi-mode, the wide working environment without special requirements of the system have important practical significance.

Keywords  power switch  uninterrupted power supply  acousto-optic alarm