开关电源论文分析解析

编号：电源技术实训(论文)说明书题目：反激式开关电源制作院（系）：信息与通信学院专业：电子信息工程学生姓名：学号：指导教师：2014年1月6日桂林电子科技大学实训说明书用纸I摘要本实验设计的开关稳压电源电路，主要采用交流-直流-交流-直流（AC-DC-AC-DC）变换技术。即将220V、50HZ的交流电（市电）转换成12V的直流电输出，中间经过滤波整流电路转换成直流电，再经过25W、12V反激式变换器整合成交流电，以提高变换效率，再经滤波整流电路转换成12V直流输出，最终得到直流电。其中用SD4870芯片控制输出电压的占空比D，采用降压式斩波方式电路，即非隔离的交换方式，调节输入输出之间一定电流通道，电感平均电流：IL=I0/1-D,调占空比可调节12V直流电压输出。总的原理是:在交流-直流电压变换器功能的中间接入直流-交流电路的结构，以增大转换效率。其主要优越性是变换效率高，可高达70%~95%，除此之外，开关稳压电源的优越性还表现有：功耗小、稳压范围宽、体积小、重量轻、安全可靠等而被人们广泛使用。关键字：AC-DC-AC-DC；反激式变换器；整流滤波；负反馈回路；占空比；SD4870桂林电子科技大学实训说明书用纸IIAbstractTheexperimentaldesignofswitchingpowersupplycircuit,themainAC-DC-AC-DC(AC-DC-AC-DC)conversiontechnology.Isabout220V,50HZAC(mains)into12VDCoutput,intermediatefilteredrectifiercircuittoconvertdirectcurrent,through25W,12VflybackconverterintegratedintotheAC,inordertoimproveconversionefficiency,andthenfilteredrectifiercircuitconvertedto12VDCoutput,andultimatelygetDC.WhichcontroltheoutputvoltagewiththeSD4780chipdutycycleD,theuseofstep-downchoppercircuit,thatis,non-isolatedexchange,regulatingcertaincurrentbetweeninputandoutputchannels,theaverageinductorcurrent:IL=I0/1-D,adjustthedutycycleadjustable12VDCvoltageoutput.Generalprincipleis:theAC-DCconverterfunctioninthemiddleofaccessDC-ACcircuitstructuretoincreasetheconversionefficiency.Itsmainadvantagesarehighconversionefficiencycanbeashighas70%to95%,inadditiontotheadvantagesofswitchingpowersupplyisalsoreflectedare:powerconsumption,widevoltagerange,smallsize,lightweight,safeandreliableetc.arewidelyused.keywords:AC-DC-AC-DC;flybackconverter;rectifierfilter;feedbackloop;duty;SD4870；桂林电子科技大学实训说明书用纸III目录引言............................................................................................................................................11设计思想与总体方案..........................................................................................................11.1设计基本要求.............................................................................................................................................11.2总体设计方案.............................................................................................................................................11.3总原理框图.................................................................................................................................................22反击式开关电源工作原理及分析......................................................................................32.1滤波电路.....................................................................................................................................................42.2整流电路.....................................................................................................................................................42.3变压器.........................................................................................................................................................62.4取样比较电路.............................................................................................................................................62.5脉宽调制电路.............................................................................................................................................63电路的安装及焊接..............................................................................................................83.1变压器的绕制.............................................................................................................................................83.2变压器的测验.............................................................................................................................................83.3元器件的焊接.............................................................................................................................................84产品调试及问题分析..........................................................................................................94.1产品调试.....................................................................................................................................................94.2问题与分析改进.......................................................................................................................................105工作总结............................................................................................................................106实训总结............................................................................................................................11谢辞......................................................................................................................................12参考文献..................................................................................................................................13附录......................................................................................................................................14桂林电子科技大学实训说明书用纸1引言开关电源高频化是其发展的方向，高频化使开关电源小型化，并使开关电源进入更广泛的应用领域，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能源、节约资源及保护环境方面都具有重要的意义。反激式开关电源变换器：也称Flyback变换器，是将