System for reducing harmonic voltage components on a battery for uninterruptible power supplies (ups) and derived apparatuses

A device for reducing the harmonic voltage components for a DC bus (103) subjected to voltage ripples, wherein the DC bus (103) comprises at least one pair of elements with the same name plate data, for example batteries (104a, 104b) or capacitors (106a, 106b), which are connected in a bridge configuration on the DC bus and in series to each other so as to define a common node (F). The common node (F) is connected, by means of a switch (2), to a reference point (P) which is equipotential with respect to a voltage reference (N). The switch (2) is configured to isolate the reference point (P) with respect to the elements (104a, 104b; 106a, 106b) in order to vary the voltage ripple on the elements (104a, 104b; 106a, 106b) depending on the situation of use.