Switched-mode power supply arrangement

A potential-isolated power supply for gate units of a high-voltage converter or high-voltage switch, comprising:

• a plurality of power semiconductor switches connected in series;
• for each gate unit, a switched-mode power supply transformer for supplying power to the gate unit, the switched-mode power supply transformer including a primary winding, a secondary winding, and a ferrite toroidal core which bears the secondary winding;
• a series circuit including the primary windings of the switched-mode power supply transformers, wherein the series circuit is connected to the output of an AC source and is provided in the form of a high voltage-isolated conductor loop which passes through all of the ferrite toroidal cores of the switched-mode power supply transformers;
• for each switched-mode power supply transformer, an output voltage regulator connected to the secondary winding of the switched-mode power supply transformer, wherein the output voltage regulator includes a) a rectifier connected to the secondary winding, and b) a single-pole electronic changeover switch that is connected downstream of the rectifier and controlled by means of a voltage regulator, wherein the single-pole electronic changeover switch connects an output of the rectifier to a respective output capacitor or short-circuits the rectifier output.