Abstract: A static conversion assembly comprises a serial connection of n apparatus each formed by the association of two converters (.DELTA.) of the type described in U.S. Pat. No. 4,330,819. Each control stage of a given apparatus (..) is adapted to furnish opposite control signals to the two controlled blocking static interrupters of each apparatus (.DELTA.). In addition, the assembly of control stages of the apparatus (.DELTA.) is driven by a centralized control unit (56) which provides a delay in the control signals of an apparatus (.DELTA.) with respect to the control signals applied to a preceeding apparatus in the serial arrangement thereof. In addition, a voltage distribution stage (51) is connected to the apparatus (..) in order to divide the applied voltage and apply only a fraction thereof to each interrupter.