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DesignofaLead-AcidBatteryChargingand
ProtectingICinPhotovoltaicSystem
学生姓名:
黄祖勋
专业:
电气工程及其自动化
指导教师:
邓方雄
2012年12月
湖北科技学院本科毕业论文(设计):
外文翻译
DesignofaLead-AcidBatteryChargingandProtectingICinPhotovoltaicSystem
ZENGDe-you,LINGChao-dong,LIGuo-gang
(YuanshunICDesignR&
DCenter,HuaqiaoUniversity,Quanzhou362021,China)
Source:
MicroelectronicDevice&
Technology,June2007
1.Introduction
Solarenergyasaninexhaustible,inexhaustiblesourceofenergymoreandmoreattention.Solarpowerhasbecomepopularinmanycountriesandregions,solarlightinghasalsobeenputintouseinmanycitiesinChina.Asakeypartofthesolarlighting,batterychargingandprotectionisparticularlyimportant.Sealedmaintenance-freelead-acidbatteryhasasealed,leak-free,pollution-free,maintenance-free,low-cost,reliablepowersupplyduringtheentirelifeofthebatteryvoltageisstableandnomaintenance,theneedforuninterruptedforthevarioustypesofhaswideapplicationinpowerelectronicequipment,andportableinstrumentation.Appropriatefloatvoltage,innormaluse(topreventover-discharge,overcharge,over-current),maintenance-freelead-acidbatteryfloatlifeofupto12~16yearsfloatvoltagedeviationof5%shortenthelifeof1/2.Thus,thechargehasamajorimpactonthistypeofbatterylife.Photovoltaic,batterydoesnotneedregularmaintenance,thecorrectchargeandreasonableprotection,caneffectivelyextendbatterylife.ChargingandprotectionICistheseparationoftheoccupiedareaandtheperipheralcircuitcomplexity.Currently,themarkethasnotyetreal,chargedwiththeprotectionfunctionisintegratedonasinglechip.Forthisproblem,designasetofbatterychargingandprotectionfunctionsinoneICisverynecessary.
2.Systemdesignandconsiderations
Thesystemmainlyincludestwoparts:
thebatterychargermoduleandtheprotectionmodule.Ofgreatsignificanceforthebatteryasstandbypoweruseoftheoccasion,Itcanensurethattheexternalpowersupplytothebattery-powered,butalsointhebatteryovercharge,over-currentandanexternalpowersupplyisdisconnectedthebatteryistoputthestatetoprovideprotection,thechargeandprotectionrolledintoonetomakethecircuittosimplifyandreducevaluableproductwasteofresources.Figure1isaspecificapplicationofthisIcinthephotovoltaicpowergenerationsystem,butalsothesourceofthisdesign.
accumulator
DCload
controller
Discharge
controller
Charge
solarbattery
array
Figure1Photovoltaiccircuitsystemblockdiagram
Maintenance-freelead-acidbatterylifeisusuallythecyclelifeandfloatlifefactorsaffectingthelifeofthebatterychargerate,dischargerate,andfloatvoltage.Somemanufacturerssaidthatiftheoverchargeprotectioncircuit,thechargingratecanbeachievedevenmorethan2C(Cistheratedcapacityofthebattery),batterymanufacturersrecommendchargingrateofC/20~C/3.Batteryvoltageandtemperature,thetemperatureisincreasedby1°
C,singlecellbatteryvoltagedrops4mV,negativetemperaturecoefficientof-4mV/°
Cmeansthatthebatteryfloatvoltage.Ordinarychargerforthebestworkingconditionat25°
C;
chargelessthantheambienttemperatureof0°
at45°
Cmayshortenthebatterylifeduetosevereovercharge.Tomakethebatterytoextendtheworkinglife,haveacertainunderstandingandanalysisoftheworkingstatusofthebattery,inordertoachievethepurposeofprotectionofthebattery.Battery,therearefourstates:
normalstate,over-currentstateoverthestateofcharge,overdischargestate.However,duetotheimpactofthedifferentdischargecurrentover-capacityandlifetimeofthebatteryisnotthesame,sothebatteryoverdischargecurrentdetectionshouldbetreatedseparately.Whenthebatteryischargingthestatealongtime,wouldseverelyreducethecapacityofthebatteryandshortenbatterylife.Whenthebatteryisthetimeofdischargestatusexceedstheallottedtime,thebattery,thebatteryvoltageistoolowmaynotbeabletorecharge,makingthebatterylifeislower.
Basedontheabove,thechargeonthelifeofmaintenance-freelead-acidbatterieshaveasignificantimpact,whilethebatteryisalwaysingoodworkingcondition,batteryprotectioncircuitmustbeabletodetectthenormalworkingconditionofthebatteryandmaketheactionthebatterycannevernormalworkingstatebacktonormaloperation,inordertoachievetheprotectionofthebattery.
3.Unitsmodulardesign
3.1Thechargingmodule
Chip,chargingmoduleblockdiagramshowninFigure2.Thecircuitryincludescurrentlimiting,currentsensingcomp