【正文】 char i。 delay_ms(100)。/*功能：進入系統(tǒng)的初始化函數(shù)*/void intosys(){uchar i。而早期單片機I/O口的驅(qū)動能力只有5mA，驅(qū)動LED時，還需要增加外部的驅(qū)動電路和器件。驅(qū)動芯片負(fù)載顯示器示器電 源 圖1 電路系統(tǒng)結(jié)構(gòu)圖 4．2 硬件模塊分析 ATmage16單片機模塊 ATmage16的簡介 ATmega16是AVR系列單片機中比較典型的芯片，其主要特點有：(1)采用先進RISC結(jié)構(gòu)的AVR內(nèi)核（2）片內(nèi)含有較大容量的非易失性的程序和數(shù)據(jù)存儲器（3）片內(nèi)含JTAG接口（4）寬電壓、高速度、低功耗（5）片內(nèi)含上電復(fù)位電路以及可編程的掉電檢測復(fù)位電路BOD；片內(nèi)含有1M/2M/4M/8M，經(jīng)過標(biāo)定的、可校正的RC振蕩器，可作為系統(tǒng)時鐘使用；多達21個各種類型的內(nèi)外部中斷源；有6種休眠模式支持省電方式工作等等。單相橋式整流電路可以將單相交流電變換為直流電；整流后的電壓脈動較大，需要濾波后變?yōu)榻涣鞣至枯^小的直流電壓用來供電；濾波后的輸出電壓容易隨電網(wǎng)電壓和負(fù)載的變化波動不利于設(shè)備的穩(wěn)定運行；將輸出電壓經(jīng)過穩(wěn)壓電路后輸出電壓不會隨電網(wǎng)和負(fù)載的變化而變化，從而提高設(shè)備的穩(wěn)定性和可靠性，保障設(shè)備的正常使用；關(guān)于輸出電壓在不同檔位之間的變換，可以將穩(wěn)壓電源的電壓設(shè)置為標(biāo)準(zhǔn)電壓再對其進行變換，電壓在檔位間的調(diào)節(jié)可以通過電位器來進行調(diào)節(jié)，從而實現(xiàn)對輸出電壓的調(diào)節(jié)。(2)控制靈活，系統(tǒng)升級方便，甚至可以在線修改控制算法，而不必改動硬件線路。學(xué)號:12202130163機電工程學(xué)院?？粕厴I(yè)論文(設(shè)計)論 文 題 目： 數(shù)控直流穩(wěn)壓電源作 者 姓 名：專 業(yè) 班 級： 電 氣 指 導(dǎo) 老 師： 二○一五 年 四 月 二十 日目 錄緒論……………………………………………………………………………………3一、前言………………………………………………………………………………3二、系統(tǒng)功能…………………………………………………………………………4三、方案論證與比較…………………………………………………………………4 穩(wěn)壓電源的分類…………………………………………………………… 4 穩(wěn)壓電源部分方案………………………………………………………… 5 三端集成穩(wěn)壓芯片………………………………………………………… 6 數(shù)字顯示部分……………………………………………………………… 6 系統(tǒng)硬件設(shè)計……………………………………………………………………7 ………………………………………………………………………7 ……………………………………………………………… 7 ATmage16單片機模塊……………………………………………… 7 L6203驅(qū)動模塊……………………………………………………… 9 5V系統(tǒng)電源模塊…………………………………………………… 11 1602液晶顯示模塊………………………………………………… 12 輸出電壓采集反饋電路模塊………………………………………12五、系統(tǒng)的軟件設(shè)計………………………………………………………………12 程序設(shè)計………………………………………………………………… 程序流程圖……………………………………………………………… 附錄1……………………………………………………………………………14附錄2…………………………………………………………………………… 結(jié)束語……………………………………………………………………… 27 參考文獻…………………………………………………………………… 27 致謝………………………………………………………………………… 27 緒論數(shù)控支流穩(wěn)壓電源是一種常見的電子儀器，廣泛的用于電子電路，教學(xué)實驗和科學(xué)研究等領(lǐng)域。(3)控制系統(tǒng)的可靠性提高，易于標(biāo)準(zhǔn)化，可以針對不同的系統(tǒng)(或不同型號的產(chǎn)品)，采用統(tǒng)一的控制板，而只是對控制軟件做一些調(diào)整即可。 方案三：輸出可調(diào)的開關(guān)電源 開關(guān)電源的功能元件工作在開關(guān)狀態(tài)，因而效率高，輸出功率大；且容易實現(xiàn)短路保護與過流保護，只是電路在低輸出電壓時開關(guān)頻率低，紋波大，穩(wěn)定度差。(2）ATmage16的引腳分析[4]。芯片Reset復(fù)位后，所有I/O口的缺省狀態(tài)為輸入方式，上拉電阻無效，即I/O為輸入高阻的三態(tài)狀態(tài)[4]。 lcd_init()。 } }/*用戶界面一，設(shè)置界面*/void user_1(){uchar i。 write_(lcd_clr)。 ch3=data%10。)。)。i++) { for(j=0。j30。 delay_ms(50)。 } if(==1) { volt=0。 //8位快速PWM，OC1A為普通用途，OC1B為PWM TCCR1B=0X09。llis going on in Beijing, the exhibit aims to show the world this brilliant section of history. The Silk Road is a series of trade and cultural transmission routes that were central to cultural interaction through regions of the Asian continent. It connected the West and East by linking traders, merchants, pilgrims, monks, soldiers, nomads, and urban dwellers from China and India to the Mediterranean Sea during various periods of time. I met my dear hubby in 2009 the second year I was in my school and it was the first year when he came here. We became colleagues. And there was nothing special happening during that year. He was just a kind and humble brother graduated from the same college as me. But we did not know each other till he became my colleague and his office desk was just in front of me. There was only a glass between us. So actually we could see each other when we both look up. But it is not the main reason that really draws us close. How we bee close to each other was something seems quite natural. We went out to play badminton with other colleagues and we sometimes chatted for a while. He is a man of few words but somehow sometimes will say something really humorous. Then one day, to my great surprise, I found a pot of beautiful flower on my desk. It was just the flower I had talked about with my colleague the other day, and I thought it was her who put the flower there. But the truth is not. It was the humble guy sitting in front of me. He just simply said ,”well, I caught sight of this flower and thought that it’s beautiful and you may like it”. I wonder why I was moved because of these simple words and present. Maybe it is the sincerity and the true self that impress me. I thanked him and some colleagues walked past my desk would appreciate the beautiful flower and they noticed that something romance happened there. Then later on, there were some little surprises once in a while. Once, there was something wrong with my drawer and I had plained about it unconsciously. And he fixed it for me. Then the other day, he placed several pink diamond roses beside the flower with a piece of paper saying” I love you more than I can say! Diamond stands for marriage, rose stand for love. I hope you are mine, bee my wife. You are the only girl who I really want to spend the rest of my life to stand by.” Although there were some grammar errors but I got what he meant. He meant so clear and so direct. Nestled close to the country39。 intosys()。 } if(volt120) { volt=120。 delay_ms(50)。 data[i]=data[j]。j++) { if(ampdata[i]ampdata[j]) { temp=ampdata[i]。 write_data(0x30+ch2)。 write_data(0x30+ch3)。 delay_ms(4)。 delay_ms(5)。 write_(0x80)。 write_(0x80)。它可以先產(chǎn)生一定脈寬的PWM 波，作為L1603 驅(qū)動電路輸入信號，然后根據(jù)所需要的基準(zhǔn)電壓與檢測到的輸出電壓的比較，調(diào)整脈寬，即改變占空比，最終實現(xiàn)高性能可調(diào)直流穩(wěn)壓 圖3內(nèi)部晶體振蕩器外接電路 L6203驅(qū)動模塊L6203驅(qū)動模塊就是將5V的輸入電壓變成Vin的電壓24V，一方面提高電壓，一方面提高電流。AVcc：為端口A和片內(nèi)ADC模擬電路電源輸入引腳。我們在選擇方案的時候考慮到電路要簡單，元件要容易找，所以我們選擇了上述的方案中的第三個方案[1]。輸出電壓可用1602LCD液晶顯示。利用分離器件組成，其體積大，功率底，可靠性差，操作使用不方便，自我保護功能不夠，因而故障率高。從組成上，數(shù)控電源可分成器件、主電路與控制等三部分。由于整個控制過程是一個負(fù)反饋過程，所以這樣的穩(wěn)壓