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How does temperature affect the capacitor?

Views: 76     Author: Site Editor     Publish Time: 2018-10-18      Origin: Site

Effect of temperature on capacitor life:

In general, the life of a capacitor is shortened with increasing temperature, the most obvious being an electrolytic capacitor. An electrolytic capacitor with an extreme operating temperature of 85 ° C can guarantee a normal working time of 181019 hours when working at a temperature of 20 ° C. When working at a limit temperature of 85 ° C, the general situation can only be guaranteed. 2000 hours of normal working hours. It can be seen that the temperature has a great influence on the life of the capacitor. The SHELCON electrolytic capacitor produced by Konecranes Electronics Co., Ltd. has an operating temperature of -40-135 ° C, high temperature resistance and long life of over 10,000 hours. industry!

 

Temperature is proportional to the loss of capacitance:

Any capacitor has a loss tangent, which is the loss value. Under normal circumstances, the tangent value will increase with the increase of temperature. For example, CC10 high-frequency ceramic capacitors have a tangent value of 0.0012 at around 20 °C and a tangent value at 85 °C. 0.0018, it can be seen that the effect of temperature on the loss of the capacitor is still quite large.

 

Temperature affects the insulation resistance of the capacitor:

Under normal circumstances, the insulation resistance of the capacitor decreases with the increase of temperature, and the decrease of the insulation resistance will cause the leakage current of the capacitor to increase, so the operation of the capacitor is the most stable at normal temperature.

 

Temperature affects the capacity of the capacitor:

The capacity of the capacitor changes with the change of temperature. When designing the precision capacitor timing circuit and the oscillation circuit whose frequency is determined by the capacitor, the influence of temperature on the capacitance capacity should be fully considered. Otherwise, the designed capacitor timing circuit will be inaccurate in timing. The oscillation frequency of the oscillating circuit changes with temperature.

 

In summary, when using capacitors, the effect of temperature on the capacitor should be fully considered. The capacitor should be operated as much as possible at around 20 °C to avoid the influence of temperature on many parameters of the capacitor.


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