铝电解电容器的推定寿命

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1、SAMXON萬裕電子有限公司MAN YUE ELECTRONICS CO., LTD.香港柴灣嘉業街10號益高工業大廈16字樓16/F., YIKO INDUSTRIAL BUILDING10, KA YIP STREET, CHAIWAN, HONG KONGTel: (852) 2897 5277 Fax: (852) 2558 6299Life calculation of Aluminum Electrolytic CapacitorReleasedate2006.12.27Prepared b康雪梅Checked byR&D刘渭清Approved byREMARK: This col

2、umn of “approved by ” must be R&D department manager signature.The factor that can affect the life of aluminum electrolytic capacitor will be the ambient temperature, the ripple current on capacitor and the actual voltage on capacitor.Because the ESR of aluminum electrolytic capacitor is larger than

3、 that of other type capacitor, heat will occur on capacitor during charging with ripple current. In order to guarantee the life of capacitor, the maximum ripple current will be regulated on each capacitor. Life calculation of capacitor during charging ripple current：1. For WV V160V ( Radials、Snap-in

4、 type)T0-Tx A T严 TxLx= L0X2 10 X25 (1)Where T0： The max usage temperature,；Tx： Ambient temperature when the capacitor using,C； T0： Temperature rising in core capacitor when the temperature being T0 with the allowable max ripple current,C；(where the T0 value designed for 105C type is 5C & the T0 valu

5、e designed for 85C type is 10C ) Tx： Temperature rising in core capacitor when the temperature being Tx with the actual ripple current,C；L0： Base (Assured) lifetime of the capacitor, hours；Lx： Lifetime of the capacitor to be estimated , hours.2. For WV 三 160V ( Radials、Snap-in type)2.1 Where Tx W20C

6、2)T0-Tx A T0-A TxLx= L0X2 10 X28 XWhere T0： The max usage temperature,C；Tx： Ambient temperature when the capacitor using,C； T0： Temperature rising in core capacitor when the temperature being T0 with the allowable max ripple current,C；(where the T0 value designed for 105C type is 5C & the T0 value d

7、esigned for 85C type is 10C) Tx： Temperature rising in core capacitor when the temperature being Tx with the actual ripple current，C；L0： Base (Assured) lifetime of the capacitor , hours；Lx： Lifetime of the capacitor to be estimated , hours；V0： Rated voltage of the capacitor , V；Vx： Actual operating

8、voltage which is applied to the capacitor, V(Here 0.8VoWVxWVo)；n : The factor of V0 and Vx each other, as follow table:nTypen = 4.4Radial type (0 D 10mm and L20mm)Snap-in typen = 2Radial type (0 D W 10mm and LW20mm)2 .2 Where Tx 20CT0-Tx A T0-2020- TxvLx= L0X2 10 X28 X25X(V ) n (3)0XWhere T0： The ma

9、x usage temperature，C；Tx： Ambient temperature when the capacitor using，C； T0： Temperature rising in core capacitor when the temperature being T0 with the allowable max ripple current，C；(where the T0 value designed for 105C type is 5C & the T0 value designed for 85C type is 10C) Tx： Temperature risin

10、g in core capacitor when the temperature being Tx with the actual ripple current，C；L0： Base (Assured) lifetime of the capacitor, hours；Lx： Lifetime of the capacitor to be estimated, hours；V0： Rated voltage of the capacitor, V；Vx： Actual operating voltage which is applied to the capacitor, V(Here 0.8

11、VoWVxWVo)。n ：The factor of V0 and Vx each other, as follow table:nTypen = 4.4Radial type (0 D 10mm and L20mm)Snap-in typen = 2Radial type (0 D W 10mm and LW20mm)Approximation of TxEstimation of the lifetime requires two temperature measurement; first obtain Tx by actually measuring the core temperat

12、ure, inserting the thermocouple inside the operating capacitor and secondary , the ambient temperature . A more convenient way to get the Tx is to convert the surface temperature of the capacitor case and the ambient temperature by a coefficient specified for each case diameter as follows:Tx=Kc . (T

13、s-Tx)Where : Kc =Coefficient from table 1Ts=Surface temperature of capacitor can, CTx=Ambient temperature , CTable 1Diameter (mm)5 to 81012.516182225Kc1.101.151.21.251.301.351.40Diameter (mm)3035405063.57689100Kc1.501.651.751.902.202.502.803.10Also, as the capacitor used in ambient environment where

14、 there is no ventilation, to simplyestimate the Tx from the actual rms ripple current, use the following equation:Tx = T0 X (actual rms ripple) / ( rated rms ripple) 2The actual and rated maximum rms ripple current shall be equaled in frequency by using frequency multipliers prescribed for each prod

15、uct series in the SPEC.General condition, may as well the T0 value designed for 105C type is 5C & the T0 value designed for 85C type is 10C, while the indicating of Tx as table 2：Table 2Ambient temperature(C)The max temperature rising (C)The max core temperature of the capacitor(C)Capacitor with 85 C252550352560452570552575652080751590851095Capacitor with 105 C25305535306545307555308565259075209585151001055110Remark: Life calculation formula of aluminum electrolytic capacitor, Because the effect of sealing material aging etc., The factual most life time is usually for fifteen years.