i the second exemplary embodiment exhibits the advantage of having a reduced number of switches with respect to the first example and also of avoiding any risk of saturation of the transformer due to an imbalance of the control sequence for the switches by virtue of the capacitors c 4 i and c 5 i in series with the primary winding of the transformer t 1 i a third exemplary embodiment of the voltage generator consists in using a transformer t 1 i with midpoint at the primary and two switches sw 2 i and sw 3 i fig9 the third exemplary embodiment exhibits the advantage of a common reference for the control of the two switches sw 2 i and sw 3 i whichever voltage generator 7 is used the conduction time of the switches sw 2 i and sw 3 i is defined so that each charging device 5 operates in the discontinuous conduction regime the operation of the equalization system 2 including a charging device 5 according to a first embodiment such as illustrated in fig5 a and a voltage generator 7 according to fig8 is described hereinafter the charging devices 5 make it possible to track the charging of certain stages under charge the operation of the setup in the discontinuous conduction regime is preferred for the reasons described previously for example when the control device 3 controls the transfer of energy to a stage et i for example to the stage et 1 the switch sw 1 1 of the charging device 5 in parallel of the corresponding stage et 1 is closed by the control device 3 this process is depicted by flow chart 100 fig1 and described below the voltage generator 7 powering the charging device 5 is also activated by the control.