Характеристики
Проектирани за изискванията на комуникационната индустрия
Приемане на международна високочестотна високочестотна фазово-изместена резонансна технология, ултра-широк обхват на енергийна мрежа ACinput,
Themoduleadoptspowerfactorcorrectiontechnology,whichisefficientandreliable.
Напълно автоматично споделяне на токN+1 излишен модулен дизайн
Themonitoringsystemrealizestherectifiermodule,feederinput,andbatteryintelligenceReal-timetubemonitoringsystemrealizesrectifiermodule,
feederinput,batteryintelligentreal-timetube
Withmulti-levellightningprotectionmeasures,thesystemhasstrongimpactresistanceandfastdynamicresponse
Completesystemscheme,whichcanbewidelyusedinvariouscommunicationequipmentsupporting
Технология
Оптимизация на дизайна на интелигентна цифрова система за захранване
Introducedthemaincharacteristicsanddevelopmentstatusofthedigitalpowersystem,brieflyanalyzedtheperformancecharacteristicsandworkingprinciplesofthevariouschipsthatmakeupthesystem,andfocusedonthecircuitdesignofthedigitalpowersystem.Itprovidesaspecificschemefortherealizationoftheoptimaldesignofthedigitalpowersystem.
Въведение
Switchingpowersuppliesaredevelopinginthedirectionofintelligenceanddigitization.Theintelligentdigitalpowersystemthathasjustcomeoutisattractingpeople'sattentionwithitsexcellentcharacteristicsandcompletemonitoringfunctions.Digitalpowersuppliesprovideintelligentadaptabilityandflexibility,withtheabilitytodirectlymonitor,processandadapttosystemconditions,andcanmeetanycomplexpowerrequirements.Inaddition,thedigitalpowersupplycanalsoensurethelong-termreliabilityofthesystemthroughremotediagnosis,includingfaultmanagement,over-currentprotection,andavoidanceofdowntime.
Характеристики
Основни характеристики на цифровата захранваща система
Цифровата захранваща система има следните характеристики.
1)Itisanintelligentswitchingpowersupplysystemcomposedofdigitalsignalprocessor(DSP)ormicrocontroller(MCU)asthecoreanddigitalpowerdriverandPWMcontrollerasthecontrolobject.Thetraditionalswitchingpowersupplycontrolledbyamicrocontroller(μPorμC)generallyonlycontrolsthestartupandshutdownofthepowersupply,andisnotatruedigitalpowersupply.
2)Adoptingthe"IntegratedDigitalPower"(FusionDigitalPower)technology,theoptimalcombinationofanaloganddigitalcomponentsintheswitchingpowersupplyisrealized.Forexample,theanalogcomponentusedinthepowerstage,theMOSFETdriver,canbeeasilyconnectedtothedigitalpowercontrollerandrealizevariousprotectionandbiaspowermanagement,andthePWMcontrollerisalsoanumericallycontrolledanalogchip.
3)Highintegration,whichrealizesthepowersystemonchipintegration(Powersystemonchip),integratingalargenumberofdiscretecomponentsintoachiporagroupofchips.
4)Itcangivefullplaytotheadvantagesofdigitalsignalprocessorsandmicrocontrollers,sothatthedesigneddigitalpowersupplycanreachhightechnicalindicators.Forexample,itspulsewidthmodulation(PWM)resolutioncanreach150ps(10-12s),whichisbeyondthereachoftraditionalswitchingpowersupplies.Thedigitalpowersupplycanalsorealizethefunctionsofmulti-phasecontrol,non-linearcontrol,loadcurrentsharingandfaultprediction,whichprovidesconvenientconditionsforthedevelopmentofgreenenergy-savingswitchingpowersupplies.
5)Удобно е за формиране на разпределена цифрова система за захранване.
Състояние на разработка
Статус на развитие на цифровата енергийна система
Withthedevelopmentofmodernscienceandtechnologyandthedemandofswitchingpowersupplymarket,Atthebeginningofthe21stcentury,thedevelopmentofdigitalpowersystemsbeganinternationally.InMarch2005,TexasInstruments(TI)announcedthelaunchofinnovativedigitalpowerproducts,whichcannotonlysignificantlyimprovetheperformanceofthepowersystem,butalsogreatlyextenditsservicelife.ThecompanyalsodemonstratedtheFusjonDigitalPowesolutiontoprovethatthedigitalpowersystemcanachievehighperformanceindicatorsanddesignflexibilityataverycompetitivelowcost.
Решението включва следните 3 вида чипове:
1)Цифров захранващ драйвер от серия UCD7K (включително UCD7100 и UCD7201);
2)UCD8K серия PWM контрол (включително UCD8620 и UCD8220);
3)Цифров сигнален процесор от серия UCD9K (UCD9110/9501).
Theabove-mentionedchipshaveformedaseriesofproductsandwillbeofficiallysoldinthefallof2005.ThisproductsupportspowersystemsfromAClinestoloads,andcanbewidelyusedintelecommunicationsfacilities,computerservers,datacenterpowersystems,anduninterruptiblepowersupplies(UPS).
Основна структура
2.lЦифров захранващ драйвер
UCD7100/7201arealldigitalcontrolpowerdriverchips.ThedifferenceisthatUCD7100isasingle-endedoutput,UCD7201isadouble-endedoutput,theratedoutputcurrentis±4A,candriveMosFETswitchpowertube,canbeadaptedtoUCD9110/9501digitalcontroller.Themaincontrollercanmonitoritsoutputcurrent,quicklydetectover-currentfaultsandquicklyturnoffthepowersupply,withadetectioncycleofonly25ns.
Вземайки UCD7100 като пример, неговата вътрешна блокова диаграма е показана на Фигура 1.
Mainlyincludes3.3Vvoltageregulatorandreferencevoltagesource,trigger,Schmittcomparator,undervoltageshutdowncircuit,controlgate,TrueDrivedriver."TrueDrive"isaproprietarytechnologyofTI.Itisahybridoutputstagecomposedofapull-up/pull-downcircuitcomposedofbipolartransistorsandMOSFETsinparallel.Itsadvantageisstrongdrivingability,normaloutputevenatlowvoltage,andcancontroltheovervoltageandundervoltageprotectionofexternalpowerMOSFETunderextremelylowoutputimpedance.ThepowerMOSFETdoesnotneedtobeconnectedtoaprotectiveSchottkyclampdiode.UCD7100canprovideahighpeakcurrenttothegateoftheMOSTFETwithinafewhundrednstoquicklyturnonthedriver.TheUCD7100'shigh-impedancedigitalinput(IN)canreceivesignalswitha3.3vlogiclevelandamaximumswitchingfrequencyof2MHz.TheSchmidtcomparatorcanisolatetheinternalcircuitfromexternalnoise.IfthePWMoutputofthecontrollerstopsatahighlevelandanover-currentfaultoccurs,thecurrentdetectioncircuitturnsofftheoutputofthedriver,andthesystemcanentertheretrymode.ThroughthewatchdogcircuitinsideDSPorMCU,thechipcanberestarted.The3.3v/lOmAvoltageregulatorinsideUCD7100canbeusedasthepowersupplyofthedigitalcontroller.
2.2PWM контролер
UCD8220/8620isadouble-endedpush-pullPWMcontrollercontrolledbyDSPorMCU.ThedifferencebetweenthetwoisthatUCD8220canbestartedwithalowvoltageof48V,anda110VhighvoltagestartcircuitisaddedinsideUCD8620.TheinternalblockdiagramofUCD8220isshownasinFig.2.
Mainlyincludes3.3vvoltageregulatorandreferencevoltagesource,pulsewidthmodulator(PWM),drivelogic,push-pulldriver,undervoltageshutdowncircuit,currentlimitingcircuit,currentdetectioncircuit.UCD8220/8620canruninpeakcurrentmodeorvoltagemode,notonlycanprogramthelimitcurrent,butalsooutputalimitcurrentdigitalsignthatcanbemonitoredbythemaincontroller.ThetimingoperatingwaveformofUCD8220/8620isshownasinFig.3.
2.3 Цифров сигнален процесор (DSP)
UCD9501 е процесор за цифрови сигнали, специално проектиран за цифрови захранващи системи от TI. Неговите подобни продукти включват TMS320F2808 и TMS320F2806. Те съдържат основно 100MHz 32-битов процесор, часовников осцилатор, 332-битови таймери, верига за наблюдение, вътрешен/външен контролер за прекъсване, SCIbus, SPIbus, CANbus и ICbus интерфейс и 12PWM сигнали. Изход, системен контролер, 16 канала и 12 бита. ADC, 16K×16Flash,6K×16SARAM,1K×16ROM .Използва стандартен интерфейс за вход/изход 3.3v, който е напълно съвместим със серията UCD8K. Използвайте PowerPADTMHTSSOP и може да се програмира софтуерен пакет QFN.
Проектиране на схеми
Интелигентната цифрова захранваща система може да бъде съставена от 6 части: PWM, захранващ драйвер, DSP, интерфейсна верига, дисплей и клавиатура. Блоковата диаграма на системата е показана на фиг.4.
ThedigitalsignalprocessorUCD9501inthefigureisconnectedtothekeyboardandthedisplaythroughtheinterfacechip.Theusercannotonlyobservethecurrentpowerparametersfromthedisplay,butalsomodifythepowerparametersatanytimethroughthekeyboard.
Inordertosimplifytheconfiguration,adigitalsignalprocessor(UCD9501)andadigitalcontrolpowerdriver(UCD7100)canalsoformanintelligentdigitalpowersystem.ThecircuitisshowninFigure5.
The+36～72VDCinputvoltageU1obtainedbyACvoltageafterrectificationandfilteringisconnectedtotheprimarywindingofthehigh-frequencytransformer;afterR1andR2aredivided,theyarerespectivelyconnectedtotheanaloginputterminalAN1ofUCD9501AndAN2.TheotherendoftheprimarywindingisconnectedtoapowerMOSFET.R3isthecurrentlimitingresistor.R4isthecurrentsenseresistor.TheoutputvoltageofthebiaswindingisrectifiedandfilteredthroughVD1andC1toobtaina+12vDCbiasvoltage,whichisconnectedtothepowersupplyterminal(UDD)ofUCD7100.The3.3vvoltageoutputbyUCD7100providespowerforUCD9501.ThesecondaryrectifierfiltercircuitiscomposedofVD2,LandC2.VD3isafreewheelingdiode,andUDistheDCoutputvoltage.Thepulsewidthmodulationsignal(PWMA)outputfromUCD9501issenttotheINterminalofUCD7100.Thelimitcurrentflagterminal(CLF)ofUCD7100isconnectedtotheinterruptterminal(INT)ofUCD9501,andthelimitcurrentsettingterminal(ILIM)isconnectedtotheGMTRterminalofUCD9501.Theoutputstagecanbeisolatedfromtheinputstagebyusinganoptocouplerisolationamplifier.
КогатоUDD=12V,UCD7100капацитет на натоварванеCLOAD=10nF,честота на превключванеf=300kHz,консумираната мощност при отклонение еP=CLOADUDD2=10nF*(12v)2*300kHz=0,432W.Ток на отклонениеI=P/UDD=0,432W/12V=0,036A .
IfUCD7201isused,twoexternalpowerMOSFETscanbedriven.Inaddition,UCD9501andUCD8620canbeusedtoformadigitalpowersystem.
Заключение
Digitalpowersystemhassignificantadvantagessuchashighintegration,highcostperformance,completepowermanagementfunctions,simpleperipheralcircuits,anduser-orienteddesign.Itcreatesfavorableconditionsforrealizingtheoptimaldesignofintelligentpowersystem.