低待机功耗ACDC开关电源

Q260046902专业做论文I低待机功耗AC/DC开关电源设计摘要：随着电力电子技术的发展，电力电子设备与人们的工作、生活关系日益密切，而任何电子设备都离不开可靠的电源。开关电源中核心的部分是控制IC，由于其具有高集成度、高性价比、最简单外围电路、高效率等优点，所以得到了广泛应用。本文主要设计了一台新型低待机功耗AC/DC开关电源。使用单端反激变换器电路，用PWM信号控制开关管MOSFET。该电源输入电压为交流220V±22V，工作频率为65KHz，输出直流功率为90W，输出直流电压为18V，同时在轻载下提供跳周期模式，具有很低的待机功耗。整个电路具有过压保护、过流保护等功能。关键词：开关电源；低待机功耗；PWMQ260046902专业做论文IIDesignofLowStandbyPowerAC/DCSwitchingPowerSupplyAbstract:Withthedevelopmentofelectricandelectronictechnology,theelectricandelectronicequipmentshavebeenusedbroadlyinourworkandlife.Thecoreofswitchingpoweriscontrollingintegratedcircuits.Becauseithasthecharacteristicsofhighintegration,mostcosteffective,simpleperipherycircuitandhighefficiency,itisusedwidely.Inthisthesis,anewtypelow-standbyAC/DCswitchingpowercontrollerisdesigned.Singleflybackconvertercircuit,aswellasthePWMsignal,isusedtocontroltheMOSFET.TheinputvoltageofthedesignedpowerisAC220V±22V,theoperatingfrequencyis65KHz,theDCpoweroutputis90W,andtheDCvoltageoutputis18V.Simultaneously,ifthepowerislightloading,jumpingcyclepatternwillbeprovided,andthestandbypowerconsumptionwillbeverylow.Inaddition,theswitchingpowerhasfunctionofover-voltageandover-currentprotection.Keywords:Switchingpower,lowpowerdissipation,PWMQ260046902专业做论文III目录第1章绪论················································································11.1课题背景、目的及意义··························································11.1.1课题的背景·································································11.1.2课题的目的及意义·······················································21.2论文的主要内容···································································2第2章电源技术介绍·······································································32.1开关电源·············································································32.2线性电源·············································································42.3电源控制IC·········································································42.4DC-DC变换器·····································································52.5带变压隔离器······································································62.5.1隔离型单端正激变换器·················································62.5.2隔离型半桥变换器·······················································72.5.3隔离型全桥变换器·······················································82.5.4隔离型反激变换电路····················································92.7开关电源控制方式·······························································102.7.1电压型控制································································112.7.2电流型控制································································122.8低待机技术介绍··································································122.8.1降频模式···································································122.8.2间歇模式···································································13第3章电源的设计方案···································································143.1控制芯片选择·····································································143.2芯片引脚介绍·····································································143.3整体电路分析·····································································153.4电源器件选择及计算····························································163.4.1变压器介绍································································16Q260046902专业做论文IV3.4.2设计输出能力的确定···················································163.4.3变压器磁芯选择及计算················································173.4.4输出滤波···································································203.4.5输出整流二极管、开关管·············································213.4.6缓冲器······································································213.4.7电流检测电阻选择······················································223.5过压保护············································································223.6过流保护············································································233.7输出控制············································································243.8输出电压调整·····································································25第4章电源的制作与调试································································274.1PCB图制作·········································································274.2实物图以及调试··································································27结论······························································································29致谢······························································································30参考文献························································································31附录······························································································33西南科技大学本科生毕业论文1第1章绪论1.1课题背景、目的及意义1.1.1课题的背景随着电力电子技术的发展，电力电子设备与人们的工作、生活的关系日益密切，而任何电子设备都离不开可靠的电源，进入80年代计算机电源全面实现了开关电源化，率先完成计算机的电源换代，进入90年代开关电源相继进入各种电子、电器设备领域，程控交换机、通讯、电子检测设备电源、控制设备电源等都已广泛地使用了开关电源，更促进了开关电源技术的迅速发展[1]。在目前世界能源供应日趋紧张,要求节能的呼声日益高涨。随着经济的发展和科学技术的进步，节约能源、保护环境已被社会各界所重视。电源是节约能源的重要环节，经过电力电子和电源技术处理之后的电力