The functions of electrolytic capacitors in the power supply are: bypass, decoupling, filtering, and energy storage.
1. Bypass capacitor is an energy storage device that provides energy for local devices. It can equalize the output of the regulator and reduce the load demand. Like a small rechargeable battery, the bypass capacitor can be charged and discharged to the device.
2, decoupling: specifically refers to the removal of noise on the chip power supply tube pin, the noise is generated by the chip itself. Configuring decoupling capacitors to suppress noise due to load changes is a common practice for reliable design of printed circuit boards.
3. Filtering: The capacitor converts the change of voltage into a change of current. The higher the frequency, the larger the peak current, thus buffering the voltage. Filtering is the process of charging and discharging.
An electrolytic capacitor is a kind of capacitor. The metal foil is a positive electrode (aluminum or tantalum), the oxide film (aluminum oxide or tantalum pentoxide) which is in close contact with the positive electrode is a dielectric, and the cathode is made of a conductive material or an electrolyte (the electrolyte may be a liquid or Solid) is composed of other materials. Since the electrolyte is the main part of the cathode, the electrolytic capacitor is named after it. At the same time, the electrolytic capacitors are not connected correctly. Aluminum electrolytic capacitors can be divided into four categories: lead-type aluminum electrolytic capacitors; horn-type aluminum electrolytic capacitors; bolt-type aluminum electrolytic capacitors; solid aluminum electrolytic capacitors.