流恒脉冲波的设计--毕业设计.doc

┊┊┊┊┊┊┊┊┊┊┊┊┊装┊┊┊┊┊订┊┊┊┊┊线┊┊┊┊┊┊┊┊┊┊┊┊┊毕业设计（论文）说明书摘要随着电力电子技术的飞速发展,各种电子设备对于电源的性能、重量、体积、效率提出了更高的要求,目前开关电源的控制方式多釆用电压控制型技术。电压控制型存在响应速度慢等缺点。针对电压控制型电路的缺点,最近十几年发展起来了电流控制型技术,它具有很好的快速响应，因此,对其进行研究设计具有十分重要的意义。本论文是在研究分析了开关电源的基本原理以及UC3846芯片与TLP250芯片的功能与特性的基础上，设计了一种基于UC3846的电流型全桥拓扑结构的恒流高频开关电源。主要进行了输入整流电容滤波、高频变压器的设计、驱动电路和控制电路等主要元器件和电路模块的选型与参数设计。论文所设计的开关电源的输入为市电220V交流，输出电压为24V，电流为5A，开关频率为90khz。最后基于原理分析与计算，搭建全桥拓扑实验平台。实验结果表明：输入整流滤波电压符合理论分析，控制电路的调试也基本符合要求。关键词:PWM控制；全桥电路；高频变压器；UC3846AbstractWiththerapiddevelopmentofpowerelectronicstechnology,variouskindsofelectronicequipmentfortheperformanceofthepower,weight,volumeandefficiencyputforwardhigherrequest,thecontrolmodeofswitchpowersupplymorebrighttypewithvoltagecontroltechnology.Voltagecontroltypeshortcomingsslowresponsespeedandsoon.Forvoltagecontrolcircuitfaulttype,typethecurrentcontroltechnologydevelopedinrecenttenyears,ithastheverygoodquickresponse,therefore,tostudydesignhastheveryvitalsignificance.Thispaperislieontheresearchandanalysisofthefullbridgetopologyofswitchpowersupplyprinciple,UC3846andTLP250chiponthebasisofthefunctionandcharacteristics.DesignedacurrentmodebasedonUC3846fullbridgetopologystructureofhighfrequencyswitchingpowersupplywithconstantcurrent.Itcontainsinputrectifiercapacitancefilter,high-frequencytransformerdesign,drivecircuit,controlcircuitofthemaincomponentsandcircuitmoduleselectionandparameterdesign.ThepaperdesignofswitchpowersupplyinputfromthemainsAC220V,outputvoltageis24V,currentis5A,theswitchingfrequencyof90khz.Thelastitbasedontheprincipleanalysisandcalculation,buildfullbridgetopologyexperimentplatform.Experimentalresultsshowthattheinputrectifierfiltervoltageaccordwiththeoreticalanalysis,thecontrolcircuitofthePWMpulsemeettherequirements,hasthegoodwaveformfeatures,varioustechnicalindicatorscanmeetthepowerrequirementsofexperimentalplatform.Keywords:PWMcontrol;fullbridgetopology;highfrequencytransformer;UC3846第PAGE\*MERGEFORMAT37页目录TOC\o"1-4"\h\uHYPERLINK\l_Toc242411绪论PAGEREF_Toc242413HYPERLINK\l_Toc