中文摘要随着电力电子技术的发展和新型功率元器件的不断出现，开关电源技术得到了飞速的发展，在计算机、通讯、电力、家用电器、航空航天等领域得到广泛应用，取得了显著的成果。本论文是通过用电源适配器芯片CR6850C设计并制作12V5A开关电源。论文主要完成的内容有：（1）根据设计需要选择开关电源电路；（2）设计主电路，控制电路，功率因数校正电路，并确定相关器件参数；（3）基于CR6850C对开关电源的控制核心部分进行设计；（4）通过实验和计算对设计中的数据进行验证；（5）进行MATLAB仿真分析。本论文对开关电源的滤波、整流、反馈电路等分别作了细致的研究工作，通过实验和计算，掌握了开关电源设计的核心技术，并对设计过程进行了详尽的阐述。关键词：开关电源；CR6850C；电路AbstractWiththedevelopmentoftheelectronictechnologyandtheemergingofnewpowercomponents,switchingpowersupplyhasbeenwidelyusedincomputer,communications,electricity,homeappliancesandaerospacefields,achievingremarkableresults.ThepresentpaperisthroughusepowercontrolchipdesignandproductionCR6850C12V5Aswitchpowersupply.Themaincontentofthepapersare:(1)Accordingtothedesignneedstochooseswitchingpowersupplycircuit;(2)Designmaincircuit,controlcircuit,thepowerfactorcorrectioncircuit,andidentifythedeviceparameters;(3)BasedonCR6850Ccontrolcoreofswitchpowerpartdesign；(4)Throughexperimentandcomputingtoverifythedatadesign;(5)OnMATLABsimulationanalysis；Inthethesis,theswitchingpowersupplyfiltering,rectifierandthefeedbackcircuitarestudiedindetails.Themaintechnologyofdesigningswitchingpowersupplyisobtainedbyexperimentsandcalculations.Thedesignprocessisspecifiedalso.Keywords:Switchpowersource;CR6850C；目录中文摘要............................................................................................................IAbstract.............................................................................................................II1绪论................................................................................................................11.1开关电源的概念和分类.......................................................................11.1.1开关电源的概念..........................................................................11.1.2开关电源的分类..........................................................................31.2开关电源设计中存在的问题与未来发展...........................................41.2.1开关电源中存在的问题..............................................................41.2.2开关电源的发展趋势..................................................................41.3开关电源设计中的开关电源术语.......................................................52开关电源设计的设计基础............................................................................72.1开关电源的主电路设计.......................................................................72.1.1主电路设计........................................................................................72.2控制电路设计.......................................................................................92.3功率因数校正电路设计.....................................................................102.3.1有源功率因数校正峰值............................................................102.4其它软开关技术应用及发展概况.....................................................113开关电源的设计基础..................................................................................133.112V5A开关电源适配器芯片CR6850C...........