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φ8×10.5L φ10×10.5L 240 235 90 60 30 30

? Recommended Land Size 各种壳号的安装尺寸

(m m)

Size Y X 1.6 1.6 1.6 2.5 2.5 Y 2.6 3.0 3.5 3.5 4.0 a 1.0 1.4 2.1 3.0 4.0 φ4 φ5 φ6.3 φ8×10.5L φ10×10.5L

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ALUMINUM ELECTROLYTIC CAPACITORS'LIFE

关于铝电解电容器的寿命

The life of non-solid aluminum electrolytic capacitors is mainly dependent on environmental conditions (e.g. ambient temperature, humidity etc.) and electrical factors(e.g. operating voltage, ripple current etc.).Generally, the wear-out mechanism of non-solid aluminum electrolytic capacitors is based on evaporation of electrolyte through the rubber seal. Consequently, the factor of temperature (ambient temperature and internal heating due to ripple current) is the most critical to electrolytic capacitor life. The effect of voltage on capacitor life is negligible, especially for low voltage electrolytic capacitors. The lifetime of non-solid aluminum electrolytic capacitors can be expressed as following equations:

非固体铝电解电容器的寿命主要依赖于使用环境条件(如环境温度,湿度等)和电负荷情况(如工作电压,纹波电流等)。通常而言,非固体铝电解电容器的失效机理被认为是电解液通过胶塞逐渐挥发导致的。因此,温度因素(环境温度及由于纹波电流而引起的内热)对电解电容器寿命有重大影响。相反,电压对电容器寿命的影响可以忽略，尤其对于低压电解电容器而言更是如此。非固体铝电解电容器的寿命可以用下列公式估算: Le=Lo·Kt·Kr Where 这里

Le expected life at operating temperature Te (h) 在工作温度Te℃下的预期寿命(h)

Lo specified life at maximum operating temperature To (h) 在最大工作温度To℃下的保证寿命(h)

Kt ambient temperature acceleration term 环境温度影响因子

Kr ripple current acceleration term 纹波电流影响因子

Y a

(To-Te)/10

Kt= Lo·A Where 这里

To maximum rated operating temperature(℃)

最大额定工作温度(℃)

Te actual ambient temperature(℃) 实际环境使用温度(℃)

A acceleration coefficient (For the range 35℃ to the maximum operating temperature, A≈

2)

加速系数(对于从35℃到最高工作温度的范围, A≈2)

Kr=2

Where 这里

△T an increase in core temperature by internal heating due to ripple current(℃)

由于纹波电流引起的内热造成电容器芯子的温升(℃) (△T=core temperature-ambient temperature 芯子湿度-环境湿度)

△T can be estimated as follows △T可用以下公式估算:

△T= (i2·R)(β·S)

Where 这里

i ripple current (A rms)

通过电容器的纹波电流(A rms)

R equivalent series resistance of the capacitor(Ω) 电容器的等效串联电阻(Ω)

2

β heat radiation coefficient(W/℃·cm)

2

铝壳的热辐射系数(W/℃·cm)

2

S surface area of the capacitor (cm)

2

电容器的表面积(cm)

The expected life of the capacitor at lower temperature neglect of ripple current effect is shown in the following figure.

当忽略纹波电流影响时,电容器在较低温度下的预期寿命可参照下图.

Quick Reference Guide of the Expected Life 预期寿命快速参考图

(-△T/5)

Capacitor ambient temperature

Example: Where a 2000hrs/105℃ guaranteed product is used continuously at 60℃, it can be expected to

have a life of 5 years.

例 如: 对于105℃ 2000小时的产品,如果在60℃环境中连续使用,它的预期寿命约5年。