1. General Description of Aluminum Electrolytic （1。）.pdf

General Descriptions of Aluminum Electolytic Capacitors 1. General Description of Aluminum Electrolytic Capacitors 1-1 Principles of Aluminum Electrolytic 1-2 Capacitance of Aluminum Electrolytic Capacitors Capacitors An aluminum electrolytic capacitor consists of cathode The capacitance of an aluminum electrolytic capacitor aluminum foil, capacitor paper (electrolytic paper), may be calculated from the following formula same as for electrolyte, and an aluminum oxide layer, which acts as a parallel-plate capacitor. the dielectric, formed on the anode foil surface. --8 εS A very thin oxide layer formed by electrolytic oxidation C = 8.855 10 d (µF) (1 - 1) (formation) offers superior dielectric constant and has ε : Dielectric constant of dielectric rectifying properties. When in contact with electrolyte, the S : Surface area (cm2) of dielectric oxide layer possesses an excellent forward direction d : Thickness (cm) of dielectric insulation property. Together with magnified effective surface area attained by etching the foil, a high To attain higher capacitance C, the dielectric constant capacitance yet small sized capacitor becomes available. ε and the surface area S must be large while the As previously mentioned, an aluminum electrolytic thickness d must be small. Table 1-1 shows the capacitor is constructed by using two strips of aluminum dielectric constants and minimum thickness of dielectrics foil (anode and cathode) with paper interleaved. This foil used in variou