Online UPS

Introduction

On-linemeansthatnomatterwhetherthegridvoltageisnormalornot,theACvoltageusedbytheloadmustpassthroughtheinvertercircuit,thatis,theinvertercircuitisalwaysinworkingcondition.On-lineUPSisgenerallyDoubleconversionstructure.Theso-calleddoubleconversionmeansthatwhentheUPSisworkingnormally,theelectricenergyissuppliedtotheloadafterbeingconvertedbyAC/DCandDC/ACtwice.

ThisUPSuninterruptiblepowersupplykeepsitsinverterinworkingcondition.ItfirstconvertsexternalACpowerintoDCpowerthroughacircuit,andthenconvertsDCpowerintohigh-qualitysinusoidalpowerthroughahigh-qualityinverter.WaveACoutputtothecomputer.ThemainfunctionofonlineUPSunderpowersupplyconditionsistostabilizevoltageandpreventelectricwaveinterference,andatthesametimechargeandmanagethebattery;intheeventofapowerfailure,itusesabackupDCpowersupply(batterypack)tosupplypowertotheinverter.Sincetheinverterisalwaysworking,thereisnoswitchingtimeproblem,anditissuitableforoccasionswithstrictrequirementsonthepowersupply.

Workingprinciple

WhentheonlineUPSisnormallypoweredbythepowergrid,theinputvoltageofthepowergridpassesthroughthenoisefiltertoremovehigh-frequencyinterferencefromthepowergrid,soastoobtainpureACpower.Therectifierperformsrectificationandfiltering,andconvertsthealternatingcurrentintoasmoothdirectcurrent,andthendividesitintotwoways.Onewayentersthechargertochargethebattery,theotherwayissuppliedtotheinverter,andtheinverterconvertsthedirectcurrentinto220V,50HzACpowersupplyLoadusage.

Whentheutilitypowerisinterrupted,theACinputhasbeencutoffandtherectifiernolongerworks.Atthistime,thebatterydischargestodeliverenergytotheinverter,andtheinverterconvertstheDCpowerintoACpower.Loadusage.Therefore,fortheload,althoughthemainspowernolongerexists,theloadisnotoutofserviceduetothemainsinterruptionandcanstilloperatenormally.

FeaturesofonlineUPS

ThemainfeaturesoftheonlinesinewaveoutputUPSareasfollows:

(1)SincetheonlineUPSisnormallyWhentheutilitypowerisinterruptedandtheinternalbatterysuppliespowertotheinverter,thepowersupplytotheloadisprovidedbytheUPSinverter.Becauseofthis,theinfluenceofanyvoltagefluctuationandinterferencefromthemainspowergridontheloadworkisfundamentallyeliminated,andtheinterference-freeregulatedpowersupplytotheloadistrulyrealized.Thisobviouslycannotbesolvedbyanykindofanti-interferenceACstabilizedpowersupply.Whenthemainsvoltagechangerangeis180~250V,itsoutputvoltagestabilityrangecanreach220V±3%,andthesinewaveoperatingfrequencystabilityrangeis50Hz±1%.

(2)ThewaveformdistortioncoefficientofthesinewaveoutputbytheonlineUPSisthesmallest,generallylessthan3%.

(3)On-lineUPScantrulyrealizeuninterruptedpowersupplytotheloadwhenthemainspowerisinterrupted.AslongasthebatteryinthemachinecanprovideenergytotheUPSinverter,regardlessofwhetherthemainspowerisinterrupted,theonlineUPSispoweredbytheinvertertotheload.Therefore,intheprocessfromthemainssupplytothemainsinterruption,thereisnoconversionactioninsidetheonlineUPS,andtheconversiontimefortheloadpowersupplyiszero.

(4)ComparedwithbackupUPS,onlineUPShasexcellentoutputvoltagetransientcharacteristics.Generally,when100%loadisloadedor100%loadisreduced,itsoutputvoltagechangerangeisabout1%,andthedurationofthischangeisgenerally1to3cycles.

(5)On-lineUPSgenerallyusesPWMtechnologyabove20kHz,anditsnoiseisrelativelysmall,about50dB.

(6)InthecontrolcircuitoftheonlineUPS,theinputtransformer,outputtransformerandphotoelectriccouplingdeviceareusedtoisolatethe"strongcurrent"drivepartfromthe"weakcurrent"controlcircuitpartfromanelectricalperspectiveTherefore,thereliabilityofthecircuithasbeengreatlyimproved.ThefailurerateofthiskindofUPSisgenerallyverylow.

Workingmode

Whenthemainspowerisnormal,themainspassesthroughthesurgeabsorptionfiltercircuit→ACconversionDCcircuit→DCconversionACcircuit→andconvertstheACoutputtosupplytheload,andatthesametimeChargethebattery;oncethemicroprocessorcontrolcircuitdetectsthatthemainspowerisinterrupted,itwillimmediatelydischargethebattery→DCpowerconversionACcircuit→andconverttheACpoweroutputtosupplytheload.IfthemicroprocessorcontrolcircuitdetectsaUPSfailure,theUPSwilljumptothebypass(BYPASS)throughtherelay(RELAY),theloadpowerwillbesuppliedbythemains,andasoundwillbeissuedtowarntheuser.

Advantages

AlsoknownasONLINEUPS,mostUPSshavestrongsoftwarefunctionsandcaneasilyaccesstheInternetforremotecontrolandintelligentmanagementofUPS.

Therealonlinetypeis:Floatingchargeandinverteratthesametime,whichmeansthatonesideisthechargingcircuit,theotheristheinverter,andthemiddleisthebattery.Thereisnoneedformicroprocessorcircuitdetectionandswitchingatall.Switchingtime.Inadditiontothetraditionalonlinefunctions,theOuyimeionlineUPSseriesismoreforuserswhorequireextremelyhighreliability.Thedesignofmultipledesignprotectionfunctionsgreatlyreducesthefailurerateandeffectivelyimprovesthesafetyandreliabilityofthepowersupply.Themostimportantequipmentprovidessafeandworry-freepowerprotection.

Performance

·Sinewaveoutput

Whetherinmainsmodeorbatterymode,itcanoutputlow-distortionsinewavepower,whichistheloadofusersTheequipmentprovidesthebestpowerprotection.

·Zeroconversiontime

Whenthemainspowerfailsorisrestored,theUPSswitchesbetweenmainsmodeandbatterymodewithoutconversiontimeatall,whicheffectivelyguaranteestheloadReliabilityofoperation.

·Inputzeroandlivewiredetectionfunction

InordertoavoidUPSmainsinputzeroandlivewirereverseconnection,themachinehasazeroandlivewirereverseconnectiondetectionfunction.

·Bypassoutputhumanization

InordertopreventusersfromlettingtheUPSworkinBYPASSMODEwithoutturningon,theutilitypowerwillbeinterrupted,andtheUPSandtheequipmentwillshutdownabnormally.UPSinputsnormalmainspower,andthereisnobypassoutputbydefault.Itmustbeturnedontohavenormalinverteroutput.

·Inputpowerfactorcorrection

UPShastheinputpowerfactorcorrectionfunction.Underfullload,theinputpowerfactorcanreachmorethan0.99,sothattheuser'spowergridenvironmentwillnotbepolluted.

·DCstart

Inthestateofmainspowerfailure,ifyouneedtousetheUPStostartthecomputerorotherloadequipment,theUPScanbedirectlypoweredonwiththebatterytomaketheuseoftheUPSmoreconvenient,reliable.

·Bypassprotection

ThebypasspowersupplyfunctiongreatlyenhancestheemergencyhandlingcapabilityoftheUPS.Atthesametime,whentheuser'sloadequipmenthasspecialrequirementsforthepowersupply,suchasthevoltagecannotbetoohigh,UPSprovidesover-voltageprotectionofbypasspowersupplytoprotecttheuser'sloadequipmentfromhigh-voltagehazards.

·Auto-startfunction

Whentheutilitypowerisabnormal,theUPSwillshutdownwhenitentersthebatterymodetosupplypoweruntilthepoweriscutoff.Whentheutilitypowerreturnstonormal,theOuyimeiUPSwillautomaticallystartupandsupplypowernormally,Noneedforuserstoturnononebyone.

·Long-actingpowersupplydesign

UPSprovidesacomprehensivelong-actingmachineforuserstochoose.Theproperconfigurationofbatterypackscanmeettherequirementsofusersfordischargingandusingtimeunderdifferentpowergridenvironments.

·Thelong-actingmachinehasastrongchargingability

Inadditiontothelongerdischargetime,theUPSlong-actingmachinehasastrongbatteryrechargingability.

·Self-checkingfunction

UPShasfaultself-diagnosisandself-protectionfunctions,andcooperateswithmonitoringsoftware,whichcanbecarriedoutonaregularorirregularbasis.

·Stronganti-interference

Forelectromagneticinterferenceandradiofrequencyinterference,HseriesUPSfollowstheinternationalstandardEN50091-2andIEC61000-4seriesstandarddesign,whicheffectivelyimprovesthesafetyofUPSuseAndreliability.

·Canbeusedwithgenerators

Wideinputvoltageandfrequencyrange,canbeusedwithmajorbrandsofgenerators,theusetimeislonger,andatthesametimeeffectivelyremovesthegenerationofgeneratorsThepoorpowersupplyprovidesapure,safeandstablepowersupplyfortheload.

·Monitoringsoftware

Inordertomaketheuser'smanagementofUPSmoreconvenientandeffective,thecorrespondingonlineversionofthemonitoringsoftwarecanbedownloadedonthewebsiteforfreetorealizeintelligentmanagement.

·Originalbattery

ThestandardUPSofUPSisequippedwithhigh-qualityoriginalbatterytoensurethesafetyandreliabilityofUPSusewithgoodbatteryquality.Thebatteryoptionofthelong-actingmachinecanbecustomizedaccordingtotheneedsoftheuser.

·Highreliability

Pureonlinedouble-changedesign,isolateandfilteroutvariousharmonicsandfaultsofthepowergrid,andintegrateshort-circuit,overload,overheating,outputundervoltageandothertechnologiestoenableThesystemrunsmorereliableandsafer.

·Automaticstartup

Theutilitypowerisinterrupted,andtheUPSdischargestoshutdowninbatterymode;whenutilitypowerisrestored,theUPScanautomaticallyturnon,whichisconvenientforunattendedpowermanagement.

Commonfaultanalysisandmaintenance

1.Whenthereismainspower,theoutputofUPSisnormal,butwhenthereisnomainspower,thebuzzerwillbeepandthereisnooutput.

Faultanalysis:Judgingfromthephenomenonthatthebatteryandinverterarepartiallyfaulty,youcancheckaccordingtothefollowingprocedures:

——Checkthebatteryvoltagetoseeifthebatteryisunder-charged,ifthebatteryisunder-charged,Itisnecessarytocheckwhetherthebatteryitselfisfaultyorthechargingcircuitisfaulty.

——Iftheoperatingvoltageofthebatteryisnormal,checkwhethertheinverterdrivecircuitworksnormally.Iftheoutputofthedrivecircuitisnormal,theinverterisdamaged.

——Iftheinverterdrivecircuitisnotworkingproperly,checkwhetherthewaveformgeneratingcircuithasPWMcontrolsignaloutput.Ifthereisacontrolsignaloutput,itmeansthatthefaultliesintheinverterdrivecircuit.

——IfthewaveformgeneratingcircuithasnoPWMcontrolsignaloutput,checkwhetheritsoutputisblockedduetotheworkoftheprotectioncircuit,andifso,findoutthereasonfortheprotection;

——IfitisprotectedIfthecircuitisnotworkingandtheworkingvoltageisnormal,andthewaveformgeneratingcircuithasnoPWMwaveformoutput,itmeansthatthewaveformgeneratingcircuitisdamaged.

Theabovetroubleshootingsequencecanalsobereversed,whichcansometimesfindfaultsfaster.

2.Thebatteryvoltageislow,butthebatteryvoltagestillcannotbechargedafterchargingformorethantenhours.

Faultanalysis:Judgingfromthephenomenonthatthebatteryorchargingcircuitisfaulty,youcancheckaccordingtothefollowingsteps:

——Checkwhethertheinputandoutputvoltageofthechargingcircuitisnormal;

——Iftheinputofthechargingcircuitisnormalandtheoutputisabnormal,disconnectthebattery

andtestagain,ifitisstillabnormal,thechargingcircuitisfaulty;

——IfthebatteryisdisconnectedIftheinputandoutputofthechargingcircuitarenormal,itmeansthatthebatteryhasbeendamagedduetolong-termuncharged,over-discharged,orendoflife.

3.Apairofpoweramplifiertransistorsoftheinverterpowerstagearedamaged.Afterreplacingthetransistorsofthesamemodel,thereasonisthatthecurrentistoolarge,andthereasonsfortheexcessivecurrentare:

——Theovercurrentprotectionfails.Whentheinverteroutputovercurrent,theovercurrentprotectioncircuitdoesnotwork;

——Thepulsewidthmodulation(PWM)componentfails,thetwocomplementarywaveformsoftheoutputareasymmetrical,andonehasalongon-time,Andtheotherconductiontimeisshort,whichmakesthetwoarmsworkunbalanced,andevenbotharmsareturnedonatthesametime,causingdamagetothetwotubes;,Theoutputwillalsobeasymmetrical.Thewaveformispassedthroughtheoutputtransformer,causingmagneticbias,thatis,unbalancedmagneticflux.Theaccumulationwillcausethetransformertosaturateandthecurrentwillincreasesharply,andthepowertubewillbeburnedout.Burnout.

4.AftertheUPSisturnedon,thereisnodisplayonthepanel,andtheUPSdoesnotwork.

Faultanalysis:Judgingfromthefaultphenomenon,thefaultliesinthemainsinput,batteryandmainsdetectionpartandbatteryvoltagedetectioncircuit:

——Checkwhetherthemainsinputfuseisburnedout;

——Ifthemainsinputfuseisintact,checkwhetherthebatteryfuseisburnedout,becausesomeUPSwillturnoffalltheoutputanddisplayoftheUPSwhenthebatteryvoltageisnotdetectedbyitself;

——Ifthebatteryinsuranceisintact,checkwhetherthemainsdetectioncircuitisworkingproperly.IfthemainsdetectioncircuitisnotworkingproperlyandtheUPSdoesnothavethefunctionofstartingwithoutmains,theUPSwillalsoturnoffalloutputsanddisplays.

——Ifthecitydetectioncircuitworksnormally,checkwhetherthebatteryvoltagedetectioncircuitisnormal.

5.WhentheUPSisconnectedtothemains,everytimetheUPSisturnedon,therelaywillbeheardrepeatedly,andthelowbatteryindicatorontheUPSpanelwillbeonandthebuzzerwillbeepforalongtime.

Accordingtotheabovefailurephenomenon,itcanbejudgedthatthefailureiscausedbythebatteryvoltagebeingtoolow,whichcausestheUPStostartunsuccessfully.Removethebatteryandperformequalizingchargefirst(allbatteriesarechargedinparallel),ifitisstillunsuccessful,onlyreplacethebattery.

6.TurnontheUPSwhenthemainspowersupplyisnormal,theinverterworkingindicatorflashes,thebuzzeremitsintermittentbeeps,theUPScanonlyworkintheinverterstate,andcannotbeconvertedtothemainsworkingstate.

Faultanalysis:theconversionofinverterpowersupplytomainspowersupplycannotbecarriedout,indicatingthatthereisafailureintheconversionpartoftheinverterpowersupplytomainspowersupply,anditisnecessarytofocusonthedetection:

——mainspowersupplyWhethertheinputfuseisdamaged;

——Ifthemainsinputfuseisintact,checkwhethertheoutputofthemainsrectifierfiltercircuitisnormal;

——Iftheoutputofthemainsrectifierfiltercircuitisnormal,checkWhetherthemainsdetectioncircuitisnormal;

——Ifthemainsdetectioncircuitisnormal,checkwhetherthecontroloutputfromtheinverterpowersupplytothemainspowersupplyisnormal.

7.UPScanonlybepoweredbycitypowerandcannotbeconvertedtoinverterpowersupply.

Faultanalysis:theconversionfrommainspowertoinverterpowersupplycannotbecarriedout,indicatingthatthereisafailureintheconversionpartofmainspowertoinverterpowersupply,anditisimportanttocheck:

——whetherthebatteryvoltageistoolow,Thebatteryfuseisintact;

——Ifthebatterypartisnormal,checkwhetherthebatteryvoltagedetectioncircuitisnormal;

Ifthebatteryvoltagedetectioncircuitisnormal,thencheckthemainssupplytotheinverterWhethertheconversioncontroloutputisnormal.