Super capacitor is used widely in many fields

but the imbalance of operating voltage is an important factor affecting its development. The grading treatment is normally made for the purpose of suppressing the influence of the dispersion on voltage of single capacitor

reducing voltage difference between the single capacitors and increasing service life of the capacitor. As for the single capacitance grading method

the corresponding circuit model is set up and

on this basis of which

the new mod-ification strategy is proposed for second gradation of voltage. The operating feature and detailed process of voltage gradation are analyzed and

finally

the simulation verification by way of Matlab is made.It is shown by the result that the method has such features as simple structure

high efficiency and applicability.