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1、ThedesignofthelithiumbatterychargerIntroductionLi-Ionrechargeablebatteriesarefindingtheirwayintomanyapplicationsduetotheirsize,weightandenergystorageadvantages.Thesebatteriesarealreadyconsideredthepreferredbatteryinportablecomputerapplications,displacingNiMHandNiCadbatteries,andc
2、ellularphonesarequicklybecomingthesecondmajormarketplaceforLi-Ion.Thereasonisclear.Li-Ionbatteriesoffermanyadvantagestotheendconsumer.Inportablecomputers,Li-IonbatterypacksofferlongerruntimesoverNiCadandNiMHpacksforthesameformfactorandsize,whilereducingweight.Thesameadvantagesare
3、trueforcellularphones.AphonecanbemadesmallerandlighterusingLi-Ionbatterieswithoutsacrificingruntime.AsLi-Ionbatterycostscomedown,evenmoreapplicationswillswitchtothislighterandsmallertechnology.Markettrendsshowacontinualgrowthinallrechargeablebatterytypesasconsumerscontinuetodeman
4、dtheconvenienceofportability.Marketdatafor1997showsthatapproximately200millioncellsofLi-Ionwillbeshipped,comparedto600millioncellsofNiMH.However,itisimportanttonotethatthreecellsofNiMHareequivalenttooneLi-Ioncellwhenpackagedintoabatterypack.Thus,theactualvolumeisveryclosetothesam
5、eforboth.1997alsomarkedthefirstyearLi-Ionwasthebatterytypeusedinthemajorityofportablecomputers,displacingNiMHforthetopspot.DataforthecellularmarketshowedashifttoLi-Ioninthemajorityofphonessoldin1997inEuropeandJapan.Li-Ionbatteriesareanexcitingbatterytechnologythatmustbewatched.To
6、makesenseofthesenewbatteries,thisdesignguideexplainsthefundamentals,thechargingrequirementsandthecircuitstomeettheserequirements.Alongwithmoreandmoretheemergenceofthehandheldelectricappliances,tothehighperformance,babysize,weightneedofthelightbatterychargeralsomoreComemorebig.The
7、batteryistechnicaltoprogresstoalsorequestcontinuouslytorefreshthecalculatewaymorecomplicatedlyisfastwiththerealization,safetyofrefresh.ThereforeneedWanttocarryonthemoreaccuratesupervisiontowardsrefreshingtheprocess,toshortentorefreshtimeandattainthebiggestbatterycapacity,andpreve
8、nt°fromthebatteryBad.TheAVRhasalreadyled