aluminum electrolytic capacitor
electric parameters deteriorate what reason be?
Reason is nothing more than 2, the decibel is increases with a decrease in capacitance loss and leakage current is added, the following specific know the reason.
(1) increases with a decrease in capacitance loss of aluminum electrolytic capacitor capacitance slow decline in the early work, this is due to the load working electrolyte constantly in the process of repair and thickening caused by anodic oxidation film.
Aluminum electrolytic capacitor in the use of late, because the more electrolyte loss and solution to thicken, resistivity due to viscosity rise, make the equivalent series resistance of working electrolyte increases, lead to loss of capacitor are increased.
At the same time, the viscosity of the electrolyte is difficult to fully contact with the corrosion process of uneven oxidation film on aluminum foil surface layer, thus make the aluminum electrolytic capacitor plate effective area is reduced, causing a sharp drop in capacitance.
This is also the service life of the capacitor towards the end of the performance.
In addition, if working electrolyte viscosity at low temperatures is overmuch, can cause loss increases with the consequences of a sharp drop in capacitance.
On the use of temperature, a ripple current is likely to be increased with a decrease in capacitance loss.
(2) leakage current increased leakage current increasing often leads to aluminum electrolytic capacitor failure.
Low level of technology, oxidation film damage and contamination is serious, poor working electrolyte formulation, raw material purity is not high, the chemical properties and electrochemical properties of the electrolyte is difficult to long-term stability, the aluminum foil purity is not high, impurity content more, etc. These factors may cause leakage current differential failure.
Serious contamination of chlorine ion in aluminum electrolytic capacitor, leak current cause contamination decomposition of oxide film, caused by perforation, led current increase further.
In conclusion, the presence of metal impurity in aluminum foil, can make the aluminum electrolytic capacitor leakage current increase, so as to shorten the life of the capacitor.
On the use of over-voltage, etc may increase the leakage current of capacitor.
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