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1、xx大学毕业设计（论文）基于UC3842的开关稳压电源的设计摘要随着电力电子技术的发展以及创新，使得开关电源这一项技术也在不断地发展与创新，由于这一成本反转点日益向低输出电力端的移动，为开关电源提供了广阔的发展空间。电源设备用以实现电能变换和功率传递，是各种电子设备正常工作的基础，而高频高效小型开关电源又是开关电源发展的必然趋势，在通信、军事装备、交通设施、仪器仪表、工业设备、家用电器等领域得到了越来越多的广泛应用。开关电源是利用现代电力电子技术，控制开关管开通和关断的时间比率，维持稳定输出电压的一种电源，
2、开关电源一般由脉冲宽度调制（PWM）控制IC和MOSFET构成。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，但二者增长速率各异。线性电源成本在某一输出功率点上，反而高于开关电源，这一点称为成本反转点。设计论文主要是利用一种性能优良的电流控制型脉宽调制器UC3842。假如由于某种原因使输出电压升高时，脉宽调制器就会改变驱动信号的脉冲宽度，亦即占空比D，使斩波后的平均值电压下降，从而达到稳压目的，反之亦然。UC3842可以直接驱动MOS管、IGBT等，适合于制作20～80W小功率开关电源。关键
3、词：开关电源；UC3842；脉宽调制35xx大学毕业设计（论文）AbstractAlongwiththePowerelectronictechnologydevelopmentandinnovation,itmakethattechnologySwitchingpowersupplyisalwaysinthewayofdevelopingandinnovating,whitthecostofinversionpointsincreasinglytothelowoutputpowerendmobile,mak
4、etheSwitchpowersupplyprovideabroadspacefordevelopment.Powerequipmentusedtoachievethepowerconversionandpowertransmission，whichisbasictothevariouselectronicdevicesworkingnormally,andthehighfrequencyandhighefficientsmallswitchingpowersupplyisaninevitabledevel
5、opmenttrend,whichisusedmoreandmoreincommunications,militaryequipment,transportacilities,instrumentation,insustrialequipment,householdappliancesandotherares.SwitchingpowersupplyusetheModernelectronictechnologytocontroltheturn-onandturn-offtimeratio,maintain
6、thestabilityoftheoutputvoltageofPowersupply.SwitchingpowersupplyusedbyPulsewidthmodulation(PWM)ControlICandMOSFET.SwitchingpowersupplyandLinearpowercomparison,theyarecost'sastheOutputPowerincreases,Buttheirgrowthisdifferent.LinearpowersupplycostsinCertaino
7、utputpowerpoint,ishigherthanSwitchingpowersupply.ThispointiscalledCostinversionpoint.DesignthesisismainlyusingakindofhighperformancecurrentcontrolPulsewidthmodulationUC3842.Ifsomereasonsmaketheoutputvoltagerise,Pulsewidthmodulatorcanchangethedrivesignalpul
8、sewidth,theDutyratioD,thechopperaftertheaveragevoltagedrop,toachievethegoalofstabilizingvoltage,Thereverseisalsotrue.UC3842CandirectlydriveMOSFET,IGBTandsoon.Suitablefortheproductionof20～80WSmallpowerswitchpo
