基于51单片机-开关稳压电源设计

分类号TP303单位代码11395密级学号1105230236学生毕业设计（论文）题目基于51单片机的开关稳压电源设计作者杨晓燕院(系)能源工程学院专业电气工程及其自动化指导教师杨宏斌答辩日期2015年5月23日榆林学院毕业设计（论文）诚信责任书本人郑重声明：所呈交的毕业设计（论文），是本人在导师的指导下独立进行研究所取得的成果。毕业设计（论文）中凡引用他人已经发表或未发表的成果、数据、观点等，均已明确注明出处。尽我所知，除文中已经注明引用的内容外，本论文不包含任何其他个人或集体已经公开发表或撰写过的研究成果。对本文的研究做出重要贡献的个人和集体，均已在文中以明确方式标明。本人毕业设计（论文）与资料若有不实，愿意承担一切相关的法律责任。论文作者签名:年月日摘要I摘要电源在电视、计算机和移动通信终端等电子设备中占有重要位置，它是一切电路能否正常工作的基础。开关稳压电源由于具有体积小、重量轻、效率高、输出稳压范围宽等优势，被应用于各种电子、电器设备领域。近年来，随着便携式电子产品的迅速增长，与其配套的电源也具有越来越广泛的市场。由于人们对电子产品的功能及性能的要求不断提高以及对节能环保的重视，高效率及高精度已经成为设计中至关重要的因素，这也是本次设计的主要目的。本文设计了一个基于51单片机的开关稳压电源。以我国市电电压作为输入，经过变压、整流和滤波得到一个直流15V电压，然后以Boost斩波电路为核心，利用51单片机输出PWM，通过按键调节PWM占空比的大小，使得输出直流电压为30V～36V可调，输出最大电流可以达到2A，电压调整率和负载调整率较低，输出噪声纹波电压峰-峰值较小，DC-DC变换器的效率能够达到80%以上。整个电路采用多种保护功能来实现系统的可靠性，而且具有输出电压、电流的显示功能。关键词：Boost电路；51单片机；PWM；DC-DC变换器基于51单片机的开关稳压电源设计IIABSTRACTIIIAswichingpowersupplybasedon51singlechipSCMABSTRACTPowerelectronicdevicessuchastelevisions,computersandmobilecommunicationterminaloccupiesanimportantposition,itisthebasisofallthecircuitworkscorrectly.Switchingpowersuppliesduetoitssmallsize,lightweight,highefficiency,widerangeofoutputvoltageandotheradvantages,areappliedinvariousareasofelectronicandelectricalequipment.Especiallyinrecentyears,withtherapidgrowthofportable,anditssupportingpoweralsohaveanincreasinglywiderangeofmarkets.Becauseofthefunctionalandperformancerequirementsforelectronicproductscontinuetoimprove,aswellasontheimportanceofenergyconservationandenvironmentalprotection,highefficiency,andhigh-precisionhasbecomeessentialaspectsofdesign,whichisthemainpurposeofthisdesign.Designbasedon51singlechipswitchingpowersupply.ToChinamainsvoltageasentered,aftertransformer,andrectifierandfilteringgetaDC15Vvoltage,thentoBoostchoppedwavecircuitforcore,using51singletabletsmachineoutputPWM,throughpressregulationPWMaccountedforemptythanofsize,makesoutputDCvoltagefor30V~36Vcanadjustable,outputmaximumcurrentreached2a,,voltageadjustmentrateandloadadjustmentrateaslow,outputnoiselineswavevoltagepeak-peakassmall,DC-DCtransformdeviceofefficiencycanreached80%above.Andusingavarietyofprotectivefunctionstoachievethereliabilityofthesystemandthedisplaycapabilitiesoftheoutputvoltageandcurrent.Keywords:BoostChopper,51singlechipmicrocomputer,PWM,DC-DCconverter基于51单片机的开关稳压电源设计IV目录V目录摘要...............................................................................................................................IABSTRACT...................................................................................................................III1绪论..............................................................................................................................11.1本设计的意义....................................................................................................11.2国内外发展研究现状........................................................................................11.2.1国外发展研究现状..................................................................................11.2.2国内发展研究现状..................................................................................21.3本设计主要内容................................................................................................21.4本章小结............................................................................................................32方案论证与比较..........................................................................................................52.1主回路拓扑........................................................................................................52.2控制方法及实现方案........................................................................................62.4系统的总体框图................................................................................................62.5系统的总体要求................................................................................................72.6本章小结............................................................................................................73硬件设计......................................................................................................................93.1主电路的设计与计算........................................................................................93.2控制电路的分析与计算..................................................................................103.3保护电路的设计................................................................................................113.4显示电路的设计..............................................................................................123.5效率的分析及计算..........................................................................................133.6系统特色..........................................................................................................143.8本章小结..........................................................................................................144软件设计....................................................................................................................154.1软件设计思路..............................................................................