平板显示器电源设计

洛阳理工学院毕业设计（论文）I平板显示器电源设计摘要随着电力电子技术的高速发展，电力电子设备与人们日常工作生活联系日益密切，而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控制设备电器、通讯设备领域，电子检测设备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。开关电源是利用现代电力电子技术，控制开关晶体管开通和关断的时间比率，维持稳定输出电压的一种电源，开关电源一般由开关器件（MOSFET、BJT等）构成利用脉冲宽度调制（PWM）控制。开关电源和线性电源相比，二者的成本都随着输出功率的增加而增长，但二者增长速率不同。随着电力电子技术的发展和创新，开关电源技术在不断地创新，使得低输出电源成本下降，这为开关电源提供了广泛的发展空间。开关电源的发展方向是高频化，因为它使开关电源向小型化发展，并使开关电源进入更广阔的应用领域，特别是在高新技术领域，从而推动了高新技术产品的小型化、轻便化。关键词：开关电源，整流，自激式振荡洛阳理工学院毕业设计（论文）IIFlatpaneldisplaypowersupplydesignABSTRACTWiththerapiddevelopmentofpowerelectronics,powerelectronicsequipmentandpeople'sdailyworklivesevercloser,andelectronicequipmentareinseparablefromthereliablepowersupply,computerpowerintothe80'sfullrealizationoftheswitchingpowersupplytechnology,thefirsttocompletethecomputer'spowergeneration,the1990shaveenteredintoavarietyofswitchingpowerelectronics,electricalappliances,communicationsdevices,electronictestingequipment,controlequipment,etc.havebeenwidelyusedswitchingpowersupply,butalsotopromotetherapiddevelopmentofswitchingpowersupplytechnology.Switchingpowersupplyistheuseofmodernpowerelectronicstechnology,controlswitchingtransistorturn-onandturn-offtimeratio,tomaintainastableoutputvoltageofapower,switchingpowersupplyswitchingdevicesgenerally(MOSFET,BJT,etc.)constitutetheuseofpulsewidthmodulation(PWM)control.Switchingandlinearpowercomparedtobothofthecostsareincreasedastheincreaseoftheoutputpower,buttheygrowatdifferentrates.Withthedevelopmentofpowerelectronicstechnologyandinnovation,constantlyswitchingpowersupplytechnologyinnovation,makingthelowoutputpowercostsdown,whichistheswitchingpowersupplyprovidesabroadspacefordevelopment.Switchingpowersupplydevelopmentinthedirectionofhigh-frequency,becauseitmakestheswitchingpowersupplytosmalldevelopmentandtoswitchpowertoenterawiderfieldofapplication,especiallyinhigh-techfields,therebypromotinghigh-techproductsofthesmall,lighter.KEYWORDS:SwitchingPowerSupply,BridgeRectifier,Self-excitation洛阳理工学院毕业设计（论文）III目录前言................................................................................................1第1章开关电源基本原理...............................................................21.1开关电源的组成与工作原理................................................21.1.1开关电源工作原理.....................................................21.1.2开关电源的构成.........................................................31.1.3开关电源的特点.........................................................41.2开关电源应用的问题与未来发展........................................51.2.1开关电源应用的问题.................................................51.2.2开关电源的发展趋势.................................................61.3开关电源的主要类型...........................................................61.3.1控制方式.....................................................................61.3.2输出取样方式.............................................................71.3.3其他方式.....................................................................9第2章自激式开关电源.................................................................112.1自激式开关电源的结构和保护电路..................................112.1.1自激式降压电源的结构和工作原理........................112.1.2降压型电源保护电路...............................................142.2自激式开关电源的器件.....................................................152.2.1开关晶体管...............................................................162.2.2开关二极管...............................................................182.2.3光电耦合器...............................................................192.2.4可调稳压器件TL431................................................222.2.5热敏电阻...................................................................222.2.6稳压器件78XX.........................................................23第3章自激式开关电源的设计.....................................................253.1总体设计.............................................................................253.2电路模块.............................................................................253.2.1启动与滤波电路.......................................................25洛阳理工学院毕业设计（论文）IV3.2.2DC/AC变换电路.......................................................263.2.3反馈与保护电路.......................................................273.2.4输出转换电路...........................................................28第4章开关电源的维护.................................................................304.1开关电源的维护方法及注意事项......................................304.2开关电源的维护方法.........................................................314.2.1常用维护方法...........................................................314.2.2常见故障的判断方法...............................................33结论..................................................................................................36谢辞..................................................................................................37参考文献..........................................................................................38附录..................................................................................................39外文资料.....................................................