Study on the relationship between energy storage efficiency and charging mode of super capacitor

Abstract

Super capacitor is now widely used in the field of design and daily life. Super capacitor is different from the normal battery, it occupyies the seat as an important role in creasing in energy storage area due to its own advantages. The principle and applications of the super capacitor were described in this article, and the equivalent circuit model of the super capacitor was modified and given. The definition of charging efficiency, discharging efficiency, storage efficiency and energy conversion efficiency were given out clearly. We can concluded that the charging efficiency of constant voltage is low and not suitable for charging through analyses of the three charging ways of constant-current, constant-voltage and constant-power. The constant current charging is fast and efficient, the constant power charging can only suit for special field as photovoltaic power generation.