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1、摘要车载逆变器就是一种能把汽车上12V直流电转化为220V/50Hz交流电的电子装置,是常用的车用电子用品。在日常生活中逆变器的应用也很广泛,比如笔记本电脑、录像机和一些电动工具等。本设计主要基于开关电源电路技术等基础知识,采用二次逆变实现逆变器的设计。主要思路是:运用TL494以及SG3525A等芯片,先将12V直流电源升压为320V/50Hz的高频交流电,再经过整流滤波将高频交流电整流为高压直流电,然后采用正弦波脉冲调制法,通过输出脉冲控制开关管的导通。最后经过LC工频滤波及相应的输入输出保护电路后,输出稳定的准正弦波,供负载使用。本设计具有灵活方便
2、、适用范围广的特点,基本能够满足实践需求。而且本设计采用高频逆变方式,具有噪声降低、反应速度提高以及电路调整灵活的优点。设计符合逆变电源小型化、轻量化、高频化以及高可靠性、低噪声的发展趋势。关键词:车载逆变器;脉冲调宽;保护电路;TL494;SG3525A;ABSTRACTCarinverterisakindofvehiclethatcanbeconvertedto220V/50Hz12VDCACelectronicdevicewhichiscommonlyusedinautomotiveelectronicproducts.Theinverterapp
3、licationsareverybroadinthedailylife,suchasnotebookcomputer,videorecorderandelectrictoolsetc.Thisdesignismainlybasedonswitchpowersupplycircuittechnologybasicknowledge,usingtwoinverterrealizeinverterdesign.ThemainideausestheTL494andSG3525Aetcchip,thefirst12Vdcpowerboostfor320V/freq
4、uency50Hzhighfrequencyalternatingcurrent,andrectificationofhighfrequencyacfilterwillrectifierforhighvoltagedcandthenusingsinepulseregulationlaw,throughtheoutputpulsecontrolswitchtubeconduction.FinallyafterLCindustrialfrequencyfilterandthecorrespondinginput/outputprotectioncircuit
5、s,stableoutputprospectivesinewave,usedforload.Thedesignisflexibleandconvenient,applyawiderangeoffeatures,canbasicallymeetthedemandofpractice.Besidesthedesignusesthehighfrequencyinverter,withnoisereduction,responsespeedandadjusttheadvantagesofflexiblecircuit.Finallythedesignconfor
6、mstothepowersupplyminiaturization,lightweight,highfrequencyandhighreliability,lownoisetrend.Keywords:carinvert;pulsewidthmodulation;circuitprotection;TL494;SG3525A;目录1绪论...............................................11.1车载逆变器及其发展......................................11.2逆变电源技术的发展
7、......................................21.3逆变电源的发展趋势......................................52设计总体目标.......................................72.1设计要求及系统指标......................................72.2总体方案的选取..........................................83整体电路设计................................
8、......113.1逆变电源整体框图.....................