基于单片机的太阳能路灯的铅酸蓄电池的快速充电系统外文文献翻译Word下载.doc

基于单片机的太阳能路灯的铅酸蓄电池的快速充电系统外文文献翻译Word下载.doc

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RAPIDCHARGESYSTEMFORLEAD-ACIDBATTERYOFSOLARENERGYSTREETLIGHTBASEDONSINGLE-CHIPMICROCOMPUTER

1.Introduction

Ourcountryisveryrichinsolarenergyresourcesandtheutilizationofsolarenergyheatisoneofthetechnologiesthatareofthehighestcommercialdegreeandthemostuniversalapplicationinnewandrenewableenergyresources.Undertheinitiativeofbuildingsavingsociety,thesolarenergyelectro-opticilluminationisourcountry'

srealisticchoiceundertheexistingnationalconditionanditreducestheexpendituresofmunicipaladministrationonstreetlamptoacertainextent.Especiallyinthenewly-builturbanroadsectionandremoteborderdistrictthathasdifficultyinusingelectricity,itisofthestrongestpromotionandistakenseriouslybyFinancedepartment;

itishonoredasthe21stcentury'

sgreenproject.

2.Thebasictheoryofbatterycharging

Inthemid-1960s,AmericanscientistMashasdonethemassiveexperimentalstudytothecharging-upprocessofringentaccumulatorcell,andproposedacceptablechargingcurvetakenbytheaccumulatorbythelowestgasefficiencyforpremise,thecurvefunctionisi=I0•e−∞.Theexperimentindicatedthatifthechargingcurrentchangesaccordingtothiscurve,itmayreducethedurationofcharginggreatly,andhasnotaffectonbattery'

scapacityanditslife,thusithadestablishedresearchdirectiontothemethodofthefastcharging.iscalledthecurvethebestchargepatterninprinciple.

ItMayseethattheinitialchargingcurrentisverybigfromtheMascurve,butweakensveryquickly.Theprimarycauseisthatitcomesintobeingthephenomenonofpolarizationduringtheprocessofcharging.Thephenomenonofpolarizationisreferstothattheinteriorthesealedaccumulatorhasproducedtheoxygenandthehydrogenduringitsprocessofcharging,whentheoxygencannotbeabsorbedpromptly,thenitpilesuponthepositiveplate,enlargethepressureoftheinteriorofbattery,thebattery’stemperaturerises,reducespositiveplate'

sareasimultaneously,performancebytheincreaseofinteriorresistance.Thepolarizationcanaffectthespeedandthequalityofcharging,andevenreducethelifeofaccumulator.Therefore,it’simportanttodevelopfastchargesystemofbatterywhoseperformanceisfineandmovementisreliable.ByNotaffectingtheservicelifeofaccumulatorasfaraspossibleforpremise,ithopedthatitcanfillthebatterycapacitysufficientlyadoptingthebiggestchargingcurrentinashorttime,andthebatteryneitherproducestoomuchgasesnorcausestheinteriorhyperpyrexiaduringtheprocess.

3.Solarstreetlightsystem

Inthesolarstreetlightsystem,accumulator’schargingsourceisfromthesolarcell,thechangeofclimateandtheuser'

sexcessiveusingelectricityareveryeasytocausetheaccumulatorover-discharge,andthereforethenormalwork'

sguaranteerateofthesolarstreetlightislowerthanthesituationofalternatingcurrentbyfar.IftheLead-acidbatteryisinthestateofover-dischargeduringuseprocess,thentheaccumulator'

slifewillreducegreatly.Otherwise,iftheaccumulatorcellhasbeenintheuseprocessfloatsthechargeortheshallowdischargecondition,thenaccumulatorcell'

sservicelifewilllengthengreatly,evenlengthenonemoretime.Therefore,thefunctionofthecharginganddischargingcontrolsystemisobviousinthestreetlightsystemmerelyreliesonthesolarcellforthebatterycharging,itsperformancehasdecidedaccumulator'

sperformance,system'

sreliabilityandsystem'

scostdirectly.

3.1pulsechargingmethod

Thetheoreticalbaseofpulsefastchargemethodisbysuperimposingcertainfrequency,widthandhighnegativepulseormidwaystopsforashorttimeduringthecharge,makestheleadionparticipatesintheresponseproducePbbydissolvingPbS04andPbO2withenoughtimeandenhancesitsdensity,alsomakestheprocreantH+andHS04-ionputasidewithenoughtimefromthesurfaceofelectrode.Itssyntheticaleffectistoreducethepolarizationoftheaccumulator'

sconcentration,permittoenlargethechargingcurrent,reducethechargingtime.

Becausethephenomenonofpolarizationisoftennotobviousduringtheinitialperiodofcharging,itmayadoptbigelectriccurrent0.8~1timeofratedcapacitytocarryontheconstant-currentcharge,makestheaccumulatorchargingattaintothe50%~60%ratedcapacityinashorttime.Stoptochargewhenthesinglestandardvoltageofaccumulatorrisesto2.4V,thewaterstartstodecomposeandmicroairemits（aboutis25milliseconds）.Inordertoeliminatetheelectricchargeaccumulationoftheelectrochemistrypolarizationandthegaswhichformsintheporeofpoleplate,afterstoppingsufficiently,Makingtheaccumulatorthroughonebigcurrentpulsewhosedirectionisoppositetochargebydischargingafterstoppingcharging,the