Device for balancing voltage on terminals of at least one capacitor of a set of N−1 capacitors connected in series between a positive terminal and a negative input terminal and connected through intermediate points, comprising at least one balancing module connected between both input terminals; each balancing module including means for determining the amount of excess or lacking charges in the intermediate points, a temporary electric energy storage element including two terminals, first current guiding means to extract electric charges from an intermediate point towards a terminal of the storage element, second current guiding means to inject electric charges from the other terminal of the storage element towards an intermediate point, and a member able to control the first means so as to extract charges from at least one intermediate point and able to control the second means so as to inject the charges to at least one intermediate point.