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Intelligentswitchpowersupply英文：Withtherapiddevelopmentofelectronictechnology,applicationfieldofelectronicsystemismoreandmoreextensive,electronicequipment,therearemoreandmorepeopleworkwithelectronicequipment,lifeisincreasinglycloserelationship.Anyelectronicequipmentareinseparablefromreliablepowersupplyforpowerrequirements,theymoreandmoreisalsohigh.Electronicequipmentminiaturizedandlowcostinthepoweroflightandthin,smallandefficientfordevelopmentdirection.Thetraditionaltransistorsseriesadjustmentmanostatiscontinuouscontrollinearmanostat.Thistraditionalmanostattechnologymoremature,andtherehasbeenalargenumberofintegratedlinearmanostatmodule,hasthestableperformanceisgood,outputripplevoltagesmall,reliableoperation,etc.Butusuallyneedarebulkyandheavyindustrialfrequencytransformerandbulkandweightarebigfilter.Inthe1950s,NASAtominiaturization,lightweightasthegoal,forarocketcarryingtheswitchpowerdevelopment.Inalmosthalfacenturyofdevelopmentprocess,switchpowerbecauseofitssmallvolume,lightweight,highefficiency,widerange,voltageadvantagesinelectric,control,computer,andmanyotherareasofelectronicequipmenthasbeenwidelyused.Inthe1980s,acomputerismadeupofallofswitchpowersupply,thefirstcompletecomputerpowergeneration.Throughoutthe1990s,switchingpowersupplyinelectronics,electricalequipment,homeappliancesareastobewidely,switchpowertechnologyintotherapiddevelopment.Inaddition,largescaleintegratedcircuittechnology,andtherapiddevelopmentofswitchpowersupplywithaqualitativeleap,raisedhighfrequencypowerproductsof,miniaturization,modulartide.Powerswitchtube,PWMcontrollerandhigh-frequencytransformerisanindispensablepartoftheswitchpowersupply.Thetraditionalswitchpowersupplyisnormallymadebyusinghighfrequencypowerswitchtubedivisionandthepins,suchasusingPWMintegratedcontrollerUC3842+MOSFETisdomesticsmallpowerswitchpowersupply,thedesignmethodofamorepopularity.Sincethe1970s,emergedinmanyfunctioncompleteintegratedcontrolcircuit,switchpowersupplycircuitincreasinglysimplified,workingfrequencyenhancesunceasingly,improvingefficiency,andforpowerminiaturizationprovidesthebroadprospect.Threeendoff-linepulsewidthmodulationmonolithicintegratedcircuitTOP(ThreeswitchLine)willTerminalOffwithpowerswitchMOSFETPWMcontrolleronepackagetogether,hasbecomethemainstreamofswitchpowerICdevelopment.AdoptTOPswitchICdesignswitchpower,canmakethecircuitsimplified,volumefurthernarrowing,costalsoisdecreasedobviouslyMonolithicswitchingpowersupplyhasthemonolithicintegrated,theminimalistperipheralcircuit,bestperformanceindex,noworkfrequencytransformercanconstituteasignificantadvantageswitchingpowersupply,etc.AmericanPI(with)companyinPowerinthemid1990sfirstlaunchedthenewhighfrequencyswitchingPowersupplychip,knownasthetopswitchPower,withlowcost,simplecircuit,higherefficiency.Thefirstgenerationofproductslaunchedin1994representedTOP100/200series,thesecondgenerationproductistheTOPSwitch-debutedin1997Ⅱ.Theaboveproductsonceappearedshowedstrongvitalityandhegreatlysimplifiesthedesignof150Wfollowingswitchingpowersupplyandthedevelopmentofnewproductsforthenewjob,also,highefficiencyandlowcostswitchpowersupplypromotionandpopularizationcreatedgoodcondition,whichcanbewidelyusedininstrumentation,notebookcomputers,mobilephones,TV,VCDandDVD,perturbationVCR,mobilephonebatterychargers,poweramplifierandotherfields,andformvariousminiaturization,density,onpricecancompetewiththelinearmanostatAC/DCpowertransformationmodule.Switchingpowersupplytointegrateddirectionoffuturedevelopmentwillbethemaintrend,powerdensitywillmoreandmorebig,toprocessrequirementswillincreasinglyhigh.Insemiconductordevicesandmagneticmaterials,nonewbreakthroughtechnologyprogressbeforemajormightfindithardtoachieve,technologyinnovationwillfocusonhowtoimprovetheefficiencyandfocusonreducingweight.Therefore,craftlevelwillbeinthepositionofpowersupplymanufacturinghigherin.Inaddition,theapplicationofdigitalcontrolICisthefuturedirectionofthedevelopmentofaswitchpower.ThistrustinDSPforspeedandanti-interferencetechnologyunceasingenhancement.Asforadvancedcontrolmethod,nowtheindividualfeelshaven'tseenpracticabilityofthemethodappearsparticularlystrong,perhapswiththepopularityofdigitalcontrol,andtherearesomenewcontroltheoryintoswitchingpowersupply.（1）Thetechnology:withhighfrequencyswitchingfrequenciesincrease,switchconvertervolumealsodecrease,powerdensityhasalsobeenboosted,dynamicresponseimproved.SmallpowerDC-DCconverterswitchfrequencywillrisetoMHz.Butastheswitchfrequencyunceasingenhancement,switchcomponentsandpassivecomponentslossincreases,high-frequencyparasiticparametersandhigh-frequencyEMIandsoonthenewissueswillalsobecaused.（2）Softswitchingtechnologies:inordertoimprovetheefficiencyofnon-linearityofvarioussoftswitch,commutationtechnicalapplicationandhygiene,representativeofsoftswitchtechnologyispassiveandactivesoftswitchtechnology,mainlyincludingzerovoltageswitch/zerocurrentswitch(ZVS/ZCS)resonance,quasiresonant,zerovoltage/zerocurrentpulsewidthmodulationtechnology(ZVS/ZCS-PWM)andzerovoltagetransition/zerocurrenttransitionpulsewidthmodulation(PWM