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ElectrolyticCapacitorRippleCurrentDeratingTestMethodandLifeTimeEvaluationFrom:郭雪松Date:Oct-27-04一.SPEC1.电解电容零件工程规格书中之StandardRating表格,其中规定了不同规格的电解电容RatedRippleCurrent值,例如:Sharp机种PWPCC904(滤波电容)67L215L-820-15N(CNN公司KXGSeries)VDCVCap.uFCasesize∮D*LmmtanδL.C.uARatedRippleCurrentmArms/105℃1min5min120Hz100KHz4508218*35.50.24157676371517852.此电容用于电源输入端滤波,因此采用120Hz时的RatedRippleCurrent规格715mA。3.而用于评估电解电容RippleCurrent之Spec要依据以下公式:SPEC=Spec(component)×频率系数(FM)×温度系数(TM)注:FM/TM取值方法见附表4.OTPV评估电解电容RippleCurrent的Derating规格为85%,因此测试值SPEC×85%时判定OK。二.TestMethod将电解电容接地端吸开串联一导线,直接用电流计探头测试该导线电流的有效值(rms),测试时要调整输入电压值(90V~264V)达到纹波电流最大。见图示:Irms三.附表(FM&TM取值方法):NCC公司产品为例1.MultiplyingFactorsonKMGSeries(radialleadtype)FrequencyMultipliersRange50Hz120Hz300Hz1KHz10KHz100KHz~3.3uF0.651.001.351.752.302.504.7uF~33uF0.751.001.251.501.751.8047uF~1000uF0.801.001.151.301.401.502200uF~0.851.001.031.051.081.08TemperatureMultipliersTemp(℃)55657585105Multipliers2.232.2321.7312.MultiplyingFactorsonKYSeriesFrequencyMultipliersRange120Hz1KHz10KHz100KHz~180uF0.400.750.901.00220uF~560uF0.500.850.941.00680uF~1800uF0.600.870.951.002200uF~0.750.900.951.003900uF4700uF~0.850.950.981.00TemperatureMultipliersTemp(℃)55657585105Multipliers2.232.2321.7313.MultiplyingFactorsonKXGSeriesFrequencyMultipliersRange120Hz1KHz10KHz100KHz~100uF1.001.752.252.5120uF~1.001.671.752.25TemperatureMultipliersTemp(℃)55657585105Multipliers2.232.2321.731*Temperaturemultipliersshowstheguidelimitsofthemaximumavailableripplecurrentateachofthetemperature,ofwhichthelifetimeattheratedmaximumoperatingtemperatureisexpected.四.电解电容寿命评估测试方法1.CalculationFormula:电容寿命LifeTime=Life(spec)×2(Ts-Tt)/10Life(spec):指spec中标明的寿命值Ts:电容最高使用温度值Tt:电容本体温度测试值2.判定方法:以上计算得出之寿命值与整机MTBF目标值比较,若大于目标值则判定OK。3.例如:SHARP机种C904Life(spec)=10000Hrs,Ts=105℃,Tt=52.6℃,。SHARPMTBF目标50000Hrs。LifeTime=10000×2(105-52.6)/10=377917Hrs50000HrsOK
本文标题:电解电容纹波及寿命测试方法
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