铝电解电容的寿命计算方法.docx

LIFETIME CALCULATION FORMULA OF ALUMINUM ELECTROLYTIC CAPACITORS 铝电解电容的寿命的计算公式1. Lifetime Calculation Formula 寿命计算公式L : Life expectancy at the time of actual use.实际使用平均寿命Lb : Basic life at maximum operating temperature最大工作温度下的基本寿命Tmax : Maximum operating temperature最大工作温度Ta : Actual ambient temperature实际环境温度△ Tjo : Internal temperature rise when maximum current is applied.USR, USC, USG : 10 °CVXP : 3.5 C Other type : 5Crated ripple 加上最大额定波纹电流后，电容器的内 部温升USR, USC, USG :：10CVXP ： 3.5C其它类型：5Cis加入实际波纹电流后，电容内部的温升△ Tj : Internal temperature rise when actual ripple current applied.F : Frequency coefficient频率系数［这个不李理解］最高工作温度时的额定波纹电流实际波纹电流Io : Rated ripple current at maximum operating temperatureI : Actual ripple current2. Ambient TEMPerature Calculation Formula 环境温度计算公式If measuring ambient temperature (Ta) is difficult, Ta can be 如果测量环境温度 / 有困难,Ja可calculated from surface temperature of the CAPACITOR as follows..以根据电谷器的表面温度按下式计Ta = Tc - △ Tj/aTa = Tc - △ Tj/a计算所使用的环境温度TcSurface TEMPerature of CAPACITOR电谷器的表面温度Ta : Calculated ambient TEMPeratureRatio of case top and core of CAPACITOR element ［此处不太理解］Case申 D W 8 10,12.5 16, 18 20, 22 25 30 351.0 1.11.2 1.3 1.41.51.63. Ripple Current Multiplier 额定电流系数(1) TEMPerature coefficient 温度系数TEMPerature coefficients are shown as below.温度系数选取如下:USR, USC, USG:Ambient TEMP")环境温度85 W65Coefficien 系数 1.01.3Other 85°C type:Ambient TEMP.CC)环境温度85 70 W50Coefficien 系数 1.01.62.0105°C type:Ambient TEMP.(°C)环境温度 105 85 W65Coefficien 系数1.0 1.7 2.1注意：使用温度系数，不可指望 寿命延长，因为温度系数是建立 在最高工作温度下的相同寿命条 件下的。

Note: Where the temperature coefficient is used, life extension cannot be expected any more because the temperature coefficient is set up condition of the same life time at maximum operating temperature.(2) Frequency Coefficient 频率系数Frequency coefficients for each series are shown in the catalogue 各个系列的频率系数已在产品目录或 or specifications. 规格书中列出。