恒流_恒压充电方式的锂电池充电器芯片

第28卷第7期

2007年7月

半导体学报

voI.28No.7

CHINESEJOURNALOFSEMICoNDUCToRS

July,2007

ChipDesignofLi__IonBatteryChargerOperatingin

Constant—Current/Constant—Voltage

ChenChefandHeLenian

(Institute

Modes

ofVLSlDesign,ZhefiangUniversity,Hangzhou

310027,China)

Abstract:AdesignforaLi- ionbatterychargerICthatcanoperateinaconstantcurrent constantvoltage(CC -CV)chargemodeisproposed.IntheCC—CVchargemode,thechargerICprovidesaconstantchargingcurrentat

thebeginning,andthenthecharging

current

begins

to

decreasebeforethebatteryvoltagereachesitsfinalvalue.

current

Afterthebatteryvoltagereachesitsfinalvalueandremainsconstant,thechargingapproachpreventschargingthebatterywithfullnoveldesignofthein

isfurtherreduced.This

can

cause

currentnear

itssaturatedvoltage,which

heating.The

core

ofthechargerICrealizestheproposedCC CVchargemode.Thechipwas

implemented

CSMC0。6,umCMOSmixedsignalprocess.TheexperimentalresultsverifytherealizationoftheproposedCC-

CVchargemode.Thevoltageofthebatteryafterchargingis4.1833V.

Keywords:Li—ionbatterycharger;constantEEACC:1205

CLCnumher:TN401

Document

current constant

voltagecharge

modes;CMOSanalogcircuit

code:AArticle

ID:0253—4177(2007)07.1030—06

current

isapplieduntilthebatteryvoltagerisesto

value,i.e.,thesaturated

volt.

Introduction

Lithium—ionbatterieshavebecomethe

mosttheir

predetermined

age,andthenthechargecurrentgraduallydecrea-

ses

whilethe

batteryvoltage

remainsconstant.

widelyused

rechargeable

batteries

on

dueto

When

thecurrentreachesminimumvalue,the

approachis

many

advantages.Researchchargemanage—

inseveral

chargecycleiscomplete.Thisprecisethanthe

constant

more

mentcircuitsismeaningfulforpracticaluse.The

Li-ionbattery

charger

IC

developed

phases.Inordertoavoidtheoverheatingofbat—teries

duringIC

the

chargingsupplied

current

approach.The

characteristicgraphoftheCC -CVapproachisil- lustratedinFig.1(a).Nevertheless,thisapproachalsohasis

near

process,Iheearliest

constant

disadvantages.Whenthebatteryvoltage

chargeronly

butsmall

itssaturatedvalue,thequantityofmateri.

chargingcurrent,andwasterminatedmanually.Itrequired

alsavailableforchemicalreactionsinsidethebat.teryislow.If

longtimetocomplete

chargecycle.

largechargingcurrentisstillsup—

cause

Moreover,manualterminationlowersthereliabil.

ity,becauseitmayresultininefficientchargeovercharge.Copeeta1.[川proposedproachthat

to

USeS

or

pliedtothebattery,thefastchargemayreactionratetoexceedthatcentration

of

the

the

allowedbythe

will

con.

chargingap—

reactants.Thisresultin

constant,largechargingcurrentover.heatingofthebattery.

Tosolve

thisproblem,we

propose

an

shortenthechargetime.However,alargechar—

im.

gingcurrentnotonlymakes

to

batterysusceptible

theavaila—

provedCC.CVchargemethod.Inthismethod,thechargingcurrent

beginsto

decrease

before

the

overcharge,butmayalsooverdrive

blechemicalreactionsinthebattery,resultinginheatingandfinallyreducingthecapacityclelifeofthebattery.

Thecharge

constant

batteryvoltagereachesitsfinalvalue,asillustra.tedinFig.1(b).Afterthebatteryvoltagereachesitsfinal

value

andremainsstable,the

charging

andcy—

methodwithconstantcurrent—

currentisfurther

reduced.Thechargingcurrent

voltage(CC—CV)modes[2’引hasbeenem—

an

beginstodecreasearound4.1Vwhenthereissuf.ficientreactant.Thus,overheatingofcausedby

the

thebatteryexceeding

ployed

rent

as

improvement

over

theconstant

cur—

approach.Underthisarrangement,aconstant

chemicalreaction

rate

tCorrespondingauthor.Email:chenc@vlsi.zju.edu.cn

Received22January2007,revisedmanuscriptreceivedMarch

2007

⑥2007

ChineseInstituteofElectronics

万方数据 

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