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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