Shenmao Capacitors specialized in aluminum electrolytic capacitors from 1970

About electrolytic capacitor leakage current and its influencing factors and solution steps

by:Shenmao     2020-10-02
About electrolytic capacitor leakage current and its influence factors and solutions, a leakage current is one of the biggest problems of aluminum electrolytic capacitor damage, because the electrolyte leakage flows consumption, aluminum electrolytic capacitor dry early failure. So, the problem of leakage current should be attention. If long-term implantation of aluminum electrolytic capacitor, Is the full name of tantalum capacitor tantalum electrolytic capacitor, on behalf of the product on the market is AVX tantalum capacitor) Can't assign, and for the first time when energized the leakage current value could be as high as 100 times of its normal value. When the capacitor stored for more than two years later, can withstand the high initial capacitor leakage current is a problem. In front of the aluminum electrolytic capacitor load circuit, therefore, it is best to aluminum electrolytic capacitor can assign of the implementation process. In addition, with the capacitor circuit has reached or exceed the storage life of the above, should make the condenser work in the absence of light load condition for an hour, to prevent excessive leakage current and ripple current caused by overheat the aluminum electrolytic capacitor & other; Explosion pulp & throughout; The accident, the leakage current of the capacitor restoration. Thus you can see, for circuit with aluminum electrolytic capacitor, during the period of storage should be charging a number of hours a year, to ensure that the guarantee circuit when the storage on the performance of the aluminum electrolytic capacitors. Will increase the leakage current of al electrolytic capacitor is placed for a long time and need to be aware of the solution is to KEMET, after a long time without aluminum electrolytic capacitor voltage condition of storage and there is no any application, the chloride ions in the electrolyte damage in alumina films were the biggest, especially under the condition of high temperature storage, from the oxide layer to the anode without leakage current through the, oxide layer will not be able to produce again. The result is when after long-term storage access voltage, leakage current will produce a higher than normal. However, as the oxide layer to produce in the course of using, the leakage flow gradually reduced to normal. At the same time as the galvanic effect of iron, copper ion also gradually restored, the aluminum electrolytic capacitor leakage current need to applied voltage for a long time to recover. This process is called aging or energized. Usually in the aluminum electrolytic capacitor can assign the best before use. Aluminum electrolytic capacitor in the condition of no voltage storage, domestic manufacturer or foreign famous manufacturer 1 year 2 years or more, before the application needs to be energized. If long-term implantation of aluminum electrolytic capacitor, Is the full name of tantalum capacitor tantalum electrolytic capacitor, on behalf of the product on the market is AVX tantalum capacitor) Can't assign, and for the first time when energized the leakage current value could be as high as 100 times of its normal value. When the capacitor stored for more than two years later, can withstand the high initial capacitor leakage current is a problem. In front of the aluminum electrolytic capacitor load circuit, therefore, it is best to aluminum electrolytic capacitor can assign of the implementation process. In addition, with the capacitor circuit has reached or exceed the storage life of the above, should make the condenser work in the absence of light load condition for an hour, to prevent excessive leakage current and ripple current caused by overheat the aluminum electrolytic capacitor & other; Explosion pulp & throughout; The accident, the leakage current of the capacitor restoration. Thus you can see, for circuit with aluminum electrolytic capacitor, during the period of storage should be charging a number of hours a year, T491A106K004AS to ensure continued stored in guarantee the circuit performance of the aluminum electrolytic capacitor. Undeniably, good seal of aluminum electrolytic capacitors can be stored to 15 years even without any performance loss. If there is no out of storage time, aluminum electrolytic capacitor capacitor after out of the library can be directly applied to the rated voltage. In this case, the assignment process don't need. Leakage current voltage characteristic in the data sheet, aluminum electrolytic capacitor leakage current test conditions are: voltage of rated voltage, temperature is the highest working temperature. Under the different voltage aluminum electrolytic capacitor leakage current with changes in the applied voltage, as shown in figure 5. 9. VR for aluminium electrolytic capacitor rated voltage, Vs for surge voltage, VF for the anodic oxidation voltage, The breakdown voltage) 。 The leakage current increases with rising voltage of the electrolytic capacitor. When the voltage across more than rated voltage and approaching surge voltage, leakage current rise rate increases with the rise of voltage, when the terminal voltage close to breakdown voltage leakage current will increase sharply, and finally become a similar constant voltage characteristic of avalanche breakdown, this & other; Avalanche breakdown & throughout; Features in the aluminum electrolytic capacitor did not produce & other; Explosion pulp & throughout; And through irreversible damage is reversible. Can use of aluminum electrolytic capacitor leakage current increased significantly since the voltage of the capacitor close to surge voltage characteristics, measuring the actual rated voltage aluminum electrolytic capacitor. CDE production of 450 vl4700ufl85 ℃ aluminum electrolytic capacitor leakage current and the relationship between the applied voltage. At the highest working temperature 85 & # 39; C, 100% rated voltage when the leakage current is 90% of rated voltage when the leakage current of four times, twice is 95% when the leakage current. Obviously, reduce the working voltage of aluminum electrolytic capacitor will help to reduce leakage current.
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