【正文】 關(guān)電源來取代傳統(tǒng)的相控電源。隨著時代的進(jìn)步，由于開關(guān)電源的變換效率有所提高，能耗也就有所減少，進(jìn)而降低了電源周圍環(huán)境的溫度，改善了廣大工作人員的工作環(huán)境。但是，隨著國內(nèi)技術(shù)的不斷進(jìn)步和生產(chǎn)規(guī)模的迅速擴(kuò)大，國外的中小型功率模塊電源正在快速的被國產(chǎn)的 DC/DC 產(chǎn)品所代替。 基于 51單片機(jī)的開關(guān)穩(wěn)壓電源 設(shè)計(jì) 2 國內(nèi)發(fā)展研究現(xiàn)狀 國內(nèi)是從 1977 年才開始進(jìn)入電源的初期發(fā)展，起步的比較晚、技術(shù)也相對比較落后。 自從單片開關(guān)電源開發(fā)以來，便顯示出了強(qiáng)大的生命力，作為一項(xiàng)具有很大的發(fā)展前景、頗具影響力的新產(chǎn)品，開關(guān)電源在世界上引起了電源界人士的普遍關(guān)注。意 法半導(dǎo)體公司隨后也開發(fā)出了 VIPer100、 VIPer100A、 VIPer100B 等中、小型功率單片電源系列的產(chǎn)品，并且得到了廣泛的應(yīng)用。 1994 年，美國電源集成公司在全世界領(lǐng)先研制成功了三端隔離式 PWM 型的單片開關(guān)電源，它叫做 AC/DC電源變換器。隨后，國外又相繼研制出開關(guān)頻率達(dá)到 1MHz 的高速 PWM、 PFM 芯片。第一是向?qū)崿F(xiàn)集成化開關(guān)電源的控制電路方向發(fā)展。 隨著集成電路的進(jìn)展，開關(guān)電源就逐漸向集成化方向發(fā)展，趨向于小型化與模塊化。這些改進(jìn)都可以使開關(guān)穩(wěn)壓電源的性能和效率大為提高，使其應(yīng)用范圍大大拓寬，尤其是在新興的通信領(lǐng)域大有用武之地 [1]。 關(guān)鍵詞 ： Boost 電路； 51 單片機(jī)； PWM； DCDC 變換器 基于 51 單片機(jī)的開關(guān)穩(wěn)壓電源 設(shè)計(jì) II ABSTRACT III A swiching power supply based on 51 singlechip SCM ABSTRACT Power electronic devices such as televisions, puters and mobile munication terminal occupies an important position, it is the basis of all the circuit works correctly. Switching power supplies due to its small size, light weight, high efficiency, wide range of output voltage and other advantages, are applied in various areas of electronic and electrical equipment. Especially in recent years, with the rapid growth of portable, and its supporting power also have an increasingly wide range of markets. Because of the functional and performance requirements for electronic products continue to improve, as well as on the importance of energy conservation and environmental protection, high efficiency, and highprecision has bee essential aspects of design, which is the main purpose of this design. Design based on 51 single chip switching power supply. To China mains voltage as entered, after transformer, and rectifier and filtering get a DC 15V voltage, then to Boost chopped wave circuit for core, using 51 single tablets machine output PWM, through press regulation PWM accounted for empty than of size, makes output DC voltage for 30V~36V can adjustable, output maximum current reached 2 a, voltage adjustment rate and load adjustment rate as low, output noise lines wave voltage peakpeak as small, DCDC transform device of efficiency can reached 80% above. And using a variety of protective functions to achieve the reliability of the system and the display capabilities of the output voltage and current. Key words: Boost Chopper,51 single chip microputer,PWM,DCDC converter 基于 51 單片機(jī)的開關(guān)穩(wěn)壓電源 設(shè)計(jì) IV 目 錄 V 目 錄 摘 要 ............................................................................................................................... I ABSTRACT .................................................................................................................... III 1 緒論 ...............................................................................................................................1 本設(shè)計(jì)的意義 .....................................................................................................1 國內(nèi)外發(fā)展研究現(xiàn)狀 .........................................................................................1 國外發(fā)展研究現(xiàn)狀 ...................................................................................1 國內(nèi)發(fā)展研究現(xiàn)狀 ...................................................................................2 本設(shè)計(jì)主要內(nèi)容 .................................................................................................2 本章小結(jié) .............................................................................................................3 2 方案論證與比較 ...........................................................................................................5 主回路拓?fù)? .........................................................................................................5 控制方法及實(shí)現(xiàn)方案 .........................................................................................6 系統(tǒng)的總體框圖 .................................................................................................6 系統(tǒng)的總體要求 .................................................................................................7 本章小結(jié) .............................................................................................................7 3 硬件設(shè)計(jì) .......................................................................................................................9 主電路的設(shè)計(jì)與計(jì)算 .........................................................................................9 控制電路的分析與計(jì)算 ...................................................................................10 保護(hù)電路的設(shè)計(jì) ................................................................................................ 11 顯示電路的設(shè)計(jì) ...............................................................................................12 效率的分析及計(jì)算 ...........................................................................................13 系統(tǒng)特色 ...........................................................................................................14 本章小結(jié) ...........................................................................................................14 4 軟件設(shè)計(jì) .....................................................................................................................15 軟件設(shè)計(jì)思路 ...................................................................................................15 PWM 程序 ..........................................................................................................16 按鍵程序 ...........................................................................................................17 本章小結(jié) ...........................................................................................................18 5 系統(tǒng)仿真測試 ..............................................................................................................19 系 統(tǒng)仿真 ..................