电容器寿命计算机

实际操作条件将直接影响铝质电解电容器的寿命,其中以环境温度的影响最大。电容器寿命与温度的关系可以根据名为「阿伦尼乌斯理论」(Arrhenius' Law of Chemical Activity)的化学反应方程式计算。简单来说,就是温度每降低10ºC,电容器的寿命便增加一倍。

电压的下降也可增加电容器的寿命,但影响程度相对较轻。因为脉冲电流引致的内部热力,会缩短铝质电解电容器的预期寿命。

电容器寿命与操作条件的关系可用以下的算式表示:

鋁質電解電容器/直立式電容器/貼片電容器

Aluminum Electrolytic Capacitor Formula
Load Life rating (hours)
Max Temperature (° C)
Ambient Temperature (° C)
Ripple Current (mA)
Frequency (Hz)
Capacitance (uF)
D.F. (%)
Rated Voltage (VDC)
Applied Voltage (VDC)
Diameter (mm)
Length (mm)

鋁質固態電容器

Ceramic Formula
Load Life rating (hours)
Max Temperature (° C)
Ambient Temperature (° C)

超級電容器

Supercapacitors Formula
Load Life rating (hours)
Max Temperature (° C)
Ambient Temperature (° C)
Rated Voltage (VDC)
Applied Voltage (VDC)

軸向電解電容器

Aluminum Electrolytic Capacitor Formula
L1 - Load Life Rating (hours)
Tm - Maximum Temperature (° C)
Ta - Ambient Temperature (° C)
Ripple Current (mA)
Frequency (Hz)
Capacitance (uF)
D.F (%)
Rated Voltage (VDC)
Applied Voltage (VDC)
Diameter (mm)
Length (mm)

薄膜電容器

The operating conditions affect the life of a film capacitor in a very similar manner to aluminum electrolytic capacitors. Voltage derating has a greater effect on the life as compared to an aluminum electrolytic capacitor. The life expectancy formula for film capacitors is expressed by the following equation:

Film Capacitor Formula
L1 - Load Life Rating (hours)
Tm - Maximum Temperature (° C)
Ta - Ambient Temperature (° C)
AC Current (A)
Frequency (Hz)
Capacitance (uF)
D.F. (%)
Rated Voltage (V)
Applied Voltage (V)
Diameter (mm)
Length (mm)
Height (mm)
Thickness (mm)

陶瓷電容器

The life of a ceramic capacitor at the operating conditions is expressed by the following equation:

Ceramic Formula
L1 - Load Life Rating
Vr - Maximum Rated Voltage
Vo - Operating Voltage
Tm - Max.Temp.Rating of Capacitor
Ta - Ambient Temp.