Abstract: The invention relates to a method and a circuit arrangement for controlling power valves included in at least one converter (2,4) forming part of a converter circuit which on its input receives at least two DC voltages (U1,U2) and transmits current pulses respectively corresponding to these DC voltages to a common load (R.sub.L) via a common output filter (L1,C1), said controlling aiming at keeping the input DC voltages equal.A control circuit (44) regulates the input voltages by shifting the starting times of the respective current pulses with respect to each other. Preferably, and particularly in continuous operation, the respective current pulses are shifted with respect to each other essentially without changing there widths.