Selection of capacitor for power supply(I)

The container is one of the most important passive components to achieve a wide range of voltage and current combinations. Although each capacitor can store electrical energy, dielectric technology plays an important role in the selection of capacitors for specific applications.

The most important applications of capacitors in power supply are storage energy, surge voltage protection, EMI suppression and control circuit. For different application fields, these dielectric technologies compete or complement each other.

Energy storage. The energy storage capacitor collects the charge through the rectifier and transmits the stored energy through the converter lead to the output end of the power supply. Aluminum electrolytic capacitors with a voltage rating of 40 to 450VDC and capacitance values between 220~150000 and F (such as B43504 or B43505 of EPCOS) are more commonly used. According to different power requirements, devices are sometimes used in series, parallel or combination. For power supply more than 10KW, a large tank type spiral terminal capacitor is usually used.