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偶然碰到這篇小文章,考慮到最近不時有人提問有關(guān)此類問題,也覺得有一定的意義,故而整理一下,帖出來供大家參考。只是個別地方譯不出來,有點遺憾。
這次趕巧了,今天還知道有位小老鄉(xiāng)趕上今天生日,說好了算作今天偶給她的小禮物,愿她能及早看到。
September 5,2001 RUBYCON CORPORATION ENGINEERING DIVISION
TO: ACBEL POLYTECH INC.
LIFETIME CALCULATION FORMULA OF ALUMINUM ELECTROLYTIC CAPACITORS 鋁電解電容的壽命的計算公式
1. Lifetime Calculation Formula 壽命計算公式

L : Life expectancy at the time of actual use. |
實際使用平均壽命 |
Lb : Basic life at maximum operating temperature |
最大工作溫度下的基本壽命 |
Tmax : Maximum operating temperature |
最大工作溫度 |
Ta : Actual ambient temperature |
實際環(huán)境溫度 |
ΔTjo : Internal temperature rise when maximum rated ripple current is applied. USR, USC, USG : 10℃ VXP : 3.5℃ Other type : 5℃
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加上最大額定波紋電流后,電容器的內(nèi)部溫升 USR, USC, USG ::10℃ VXP : 3.5℃ 其它類型:5℃
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ΔTj : Internal temperature rise when actual ripple current is applied.

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加入實際波紋電流后,電容內(nèi)部的溫升

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F : Frequency coefficient |
頻率系數(shù)[這個不李理解] |
Io : Rated ripple current at maximum operating temperature |
最高工作溫度時的額定波紋電流 |
I : Actual ripple current |
實際波紋電流 |
2. Ambient Temperature Calculation Formula 環(huán)境溫度計算公式
If measuring ambient temperature (Ta) is difficult, Ta can be calculated from surface temperature of the capacitor as follows. .
Ta = Tc – ΔTj/α
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如果測量環(huán)境溫度Ta有困難,Ta可以根據(jù)電容器的表面溫度按下式計算:
Ta = Tc – ΔTj/α
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Ta : Calculated ambient Temperature |
計算所使用的環(huán)境溫度 |
Tc : Surface Temperature of capacitor |
電容器的表面溫度 |
α : Ratio of case top and core of capacitor element |
[此處不太理解] |
CaseφD |
≤ 8 |
10,12.5 |
16, 18 |
20, 22 |
25 |
30 |
35 |
α |
1.0 |
1.1 |
1.2 |
1.3 |
1.4 |
1.5 |
1.6 |
3. Ripple Current Multiplier 額定電流系數(shù) (1) Temperature coefficient 溫度系數(shù) Temperature coefficients are shown as below. 溫度系數(shù)選取如下:
USR, USC, USG:
Ambient Temp.(℃)環(huán)境溫度 |
85 |
≤65 |
Coefficien 系數(shù) |
1.0 |
1.3 |
Other 85°C type:
Ambient Temp.(℃)環(huán)境溫度 |
85 |
70 |
≤50 |
Coefficien 系數(shù) |
1.0 |
1.6 |
2.0 |
105°C type:
Ambient Temp.(℃)環(huán)境溫度 |
105 |
85 |
≤65 |
Coefficien 系數(shù) |
1.0 |
1.7 |
2.1 |
Note: Where the temperature coefficient is used, life extension cannot be expected any more because the temperature coefficient is set up on condition of the same life time at maximum operating temperature. |
注意:使用溫度系數(shù),不可指望壽命延長,因為溫度系數(shù)是建立在最高工作溫度下的相同壽命條件下的。 |
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| (2) Frequency Coefficient 頻率系數(shù)
Frequency coefficients for each series are shown in the catalogue or specifications. |
各個系列的頻率系數(shù)已在產(chǎn)品目錄或規(guī)格書中列出。 |
Should you have any questions, please don’t hesitate to ask us. 如你還有什么問題,請及時向我們提出,不必猶豫。
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