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1、DesignofaLead-AcidBatteryChargingandProtectingICinPhotovoltaicSystemZENGDe-you,LINGChao-dong,LIGuo-gang(YuanshunICDesignR&DCenter,HuaqiaoUniversity,Quanzhou362021,China)Source:MicroelectronicDevice&Technology,June20071.IntroductionSolarenergyasaninexhaustible,inexhaustiblesourceofenergymoreandmo
2、reattention.Solarpowerhasbecomepopularinmanycountriesandregions,solarlightinghasalsobeenputintouseinmanycitiesinChina.Asakeypartofthesolarlighting,batterychargingandprotectionisparticularlyimportant.Sealedmaintenance-freelead-acidbatteryhasasealed,leak-free,pollution-free,maintenance-free,low-co
3、st,reliablepowersupplyduringtheentirelifeofthebatteryvoltageisstableandnomaintenance,theneedforuninterruptedforthevarioustypesofhaswideapplicationinpowerelectronicequipment,andportableinstrumentation.Appropriatefloatvoltage,innormaluse(topreventover-discharge,overcharge,over-current),maintenance
4、-freelead-acidbatteryfloatlifeofupto12~16yearsfloatvoltagedeviationof5%shortenthelifeof1/2.Thus,thechargehasamajorimpactonthistypeofbatterylife.Photovoltaic,batterydoesnotneedregularmaintenance,thecorrectchargeandreasonableprotection,caneffectivelyextendbatterylife.ChargingandprotectionICisthese
5、parationoftheoccupiedareaandtheperipheralcircuitcomplexity.Currently,themarkethasnotyetreal,chargedwiththeprotectionfunctionisintegratedonasinglechip.Forthisproblem,designasetofbatterychargingandprotectionfunctionsinoneICisverynecessary.2.SystemdesignandconsiderationsThesystemmainlyincludestwopa
6、rts:thebatterychargermoduleandtheprotectionmodule.Ofgreatsignificanceforthebatteryasstandbypoweruseoftheoccasion,Itcanensurethattheexternalpowersupplytothebattery-powered,butalsointhebatteryovercharge,over-currentandanexternalpowersupplyisdisconnectedthebatteryistoputthestatetoprovideprotection,
7、thechargeandprotectionrolledintoonetomakethecircuittosimplifyandreducevaluableproductwasteofresources.Figure1isaspecificapplicationofthisIcinthephotovoltaicpowergenerationsystem,butalsothesourceofthisdesign.13accumulatorDClo
