1. Disadvantages of electrolytic capacitors
Because of its large capacity and low price, it is widely used in rectifier and filter circuits.
The heating of electrolytic capacitors can accelerate the consumption of electrolyte and dry up, and even cause the electrolyte to boil and burst the slurry.
At the same time, the drying of the electrolyte can also reduce the ability of ripple current to bear, and shorten the service life of the capacitor.
The drying of the electrolyte can also increase the leakage current of the electrolytic capacitor, increase the loss, and cause transient overtemperature and other hazards.
Therefore, heat generation is a factor that cannot be ignored in the use of electrolytic capacitors. In use, it should be ensured that the electrolytic capacitors should not exceed their rated operating temperature and avoid heat sources as much as possible. When necessary, effective measures should be used for cooling.
2.the characteristics of tantalum capacitors
It is the best capacitor among capacitors. It is a product with a small size and a large capacity. It is better than solid capacitors and electrolytic capacitors and has a higher price. It was first developed by Bell Laboratories in the United States in 1956. Performance is excellent.
Since there is no electrolyte inside the tantalum capacitor, it is suitable for working at high temperature. This unique performance guarantees its advantages of long life and reliability.
The working medium of a tantalum capacitor is an extremely thin tantalum pentoxide film formed on the surface of tantalum metal. This layer of oxide film dielectric is combined with one end of the capacitor to form a whole, and cannot exist alone. Therefore, it has a very high working electric field strength per unit volume, and has a particularly large electric capacity, that is, a very high specific capacity, so it is particularly suitable for miniaturization.
Tantalum capacitors have various shapes and are made into small and chip components suitable for surface mounting.
The application range of tantalum capacitors is also beginning to be used in industrial control, film and television equipment, communication instruments, computer motherboards and other products.