程志意方1210-8基于TOP258PN的单端反激式单片开关电源控制系统设计

石家庄铁道大学四方学院毕业设计基于TOP258PN的单端反激式单片开关电源控制系统设计TheDesignofSingleEndedFlybackSwitchingPowerSupplyControlSystemBasedonTop258pn2016届电气工程系专业电气工程及其自动化学号20127145学生姓名程志意指导老师高艳玲完成日期2016年6月1日毕业设计成绩单学生姓名程志意学号20127145班级方1210-8专业电气工程及其自动化毕业设计题目基于TOP258PN的单端反激式单片开关电源控制系统设计指导教师姓名高艳玲指导教师职称副教授评定成绩指导教师得分评阅人得分答辩小组组长得分成绩：主任签字(盖章）：年月日四、预期达到的效果220V电源输入通过预定程序的编程，以达到稳定输出电压的目的。2016年3月18日2016年3月18日交流220输入电压整流滤波高频变压整流滤波高压直流输出功率变换电路脉宽调制比较器取样器振荡器基准电压摘要开关电源朝着高频化电源发展创新，高频化带来的效益使开关电源装置空前地小型化，并使开关电源进入更广泛的领域，特别是在高新技术领域的应用，推动了高新技术产品的小型化、轻便化。另外开关电源的发展与应用在节约资源及保护环境方面都具有深远的意义。本次设计通过TOP258PN集成芯片为核心，来实现一款单端反激式单片开关电源。电压取自于市电压220V，输出36W的电源设计，交流供电的输入经过单端反激式变压器调压，进行器件整流滤波，电流电压信号进入TOP258PN的内部进行相关引脚的钳位和导通，进行信号的转换从而稳定电压电流。利用TOP258PN来控制PWM的波形和开关断时间，实现电流电压的控制，采用PC817、TL431等专用芯片以及其他的电路元件相配合作为反馈电路，对输出信号进行调节进而稳定输出电压达到额定的输出值并且保持稳定不变，通过以上电路的构成使设计出的开关电源具有自动稳压功能。经过实物的运行与调试，结果表明输出电压达到稳定值24V，输出电流1.5A，完成了设计的要求，并且实现了过欠压保护。关键词：开关电源TOP258PN单端反激式AbstractPowerswitchtowardshighfrequencypowerdevelopmentinnovation,thefrequencywillbringthebenefitsoftheunprecedentedminiaturizationofswitchpowersupplydevice,andmaketheswitchpowersupplyintobroaderareas,particularlytheapplicationinthefieldofhightechnology,promotetheminiaturizationofhightechnologyproducts,light.Inadditiontoswitchingpowerdevelopmentandapplicationinsavingresourcesandprotectingtheenvironmenthasfar-reachingsignificance.ThedesignbyTOP258PNintegratedchipasthecore,toachieveasingleendedflybackmonolithicswitchingpowersupply.Voltageistakenfrominthecityvoltage220V,36Woutputpowersupplydesign,ACpowersupplyinputthroughasingleendflybacktransformerpressure,rectifierfilter,currenttovoltagesignalsintotheinternalTOP258PNwererelatedtopinclampandconduction,signalconversionandthusthestabilityofvoltageandcurrent.TheTOP258PNtocontrolPWMwaveformandswitchofftime,realizesthecontrolofvoltageandcurrent,thePC817andTL431dedicatedchipandotherelectricRoadelementmatchingcooperationasafeedbackcircuit,ontheoutputsignalofregulatorandtostabilizetheoutputvoltagereachestheratedoutputvalueandkeepstable,bycompositionoftheabovecircuitmakesthedesignofswitchingpowersupplywithautomaticvoltageregulatorfunction.Afterrunninganddebugginginkind,theresultsshowthattheoutputvoltagereachesastablevalueof24V,theoutputcurrent1.5A,completedthedesignrequirements,andachievedoverundervoltageprotection.Keywords：SwitchingpowersupplyTOP258PNSingle-endedflybacktypeI目录第1章绪论··································································································································31.1课题研究的目的意义··········································································································31.2国内外研究现状··················································································································31.3论文研究内容······················································································································5第2章控制系统的要求及方案···································································································62.1设计要求·····························································································································62.2设计方案·····························································································································62.2.1主电路设计···················································································································72.2.2控制电路原理设计·······································································································7第3章单端反激式单片开关电源原理·······················································································83.1单端反激式拓扑分析··········································································································83.2基本关系式··························································································································93.3开关电源电路图················································································································103.4TOPSwitch系列芯片工作原理·······················································································11第4章控制系统硬件电路设计·································································································134.1高频开关控制电路的设计································································································134.2元器件的选择与设计········································································································144.2.1控制芯片TOP258PN·································································································144.2.2TOP258PN内部结构和引脚功能·············································································164.2.3TOP258PN的特点·····································································································184.2.4线性光耦合器PC817·································································································184.2.5可调精密并联稳压器TL431·····················································································194.2.6反馈回路的设计······································