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1、ADIAD8450电池测试和监控的模拟前端和控制器解决方案时间：2016-09-3009:39:04 作者：ADI 来源：中电网ADI公司的AD8450是用于电池测试和监控的精密模拟前端和控制器.集成的精密可编程增益仪表放大器(PGIA)测量电池充电/放电电流,而可编程增益差动放大器(PGDA)测量电池电压,内部激光调整电阻网络设置PGIA和PGDA的增益:PGIA增益为26×,66×,133×和200×;PGDA增益为0.2×,0.27×,0.4×和0.8×.主要用在电池测试和形成以及电池模块测试.本文介绍了AD8450功能框图和详细框图,以及评
2、估板AD8450-EVALZ/ADP1972-EVALZ主要特性,框图,评估板的电源板和模拟控制板电路图,材料清单和PCB设计图.TheAD8450isaprecisionanalogfrontendandcontrollerfortestingandmonitoringbatterycells.Aprecisionprogrammablegaininstrumentationamplifier(PGIA)measuresthebatterycharge/dischargecurrent,andaprogrammablegaindifferenceamplifier(
3、PGDA)measuresthebatteryvoltage.InternallasertrimmedresistornetworkssetthegainsforthePGIAandthePGDA,optimizingtheperformanceoftheAD8450overtheratedtemperaturerange.PGIAgainsare26,66,133,and200.PGDAgainsare0.2,0.27,0.4,and0.8.VoltagesattheISETandVSETinputssetthedesiredconstantcurrent(CC)a
4、ndconstantvoltage(CV)values.CCtoCVswitchingisautomaticandtransparenttothesystem.ATTLlogiclevelinput,MODE,selectsthechargeordischargemode(highforcharge,lowfordischarge).Ananalogoutput,VCTRL,interfacesdirectlywiththeAnalogDevices,Inc.,ADP1972PWMcontroller.TheAD8450includesresistorprogramm
5、ableovervoltageandovercurrentdetectionandcurrentsharingcircuitry.Currentsharingisusedtobalancetheoutputcurrentofmultiplebridgedchannels.TheAD8450simplifiesdesignsbyprovidingexcellentaccuracy,performanceovertemperature,flexibilitywithfunctionality,andoverallreliabilityinaspace-savingpack
6、age.TheAD8450isavailableinan80-lead,14mm×14mm×1mmLQFPpackageandisratedforanoperatingtemperatureof−40°Cto+85°C.AD8450主要特性:IntegratedconstantcurrentandvoltagemodeswithautomaticswitchoverChargeanddischargemodesPrecisionvoltageandcurrentmeasurementIntegratedprecisioncontrolfeedbackblocksPre
7、cisioninterfacetoPWMorlinearpowerconvertersProgrammablegainsettingsCurrentsensegains:26,66,133,and200Voltagesensegains:0.2,0.27,0.4,and0.8ProgrammableOVPandOCPfaultdetectionCurrentsharingandbalancingExcellentacanddcperformanceMaximumoffsetvoltagedrift:0.6μV/℃Maximumgaindrift:3p
