An exemplary embodiment of the disclosure pertains to a high-voltage AC-DC converter converting alternating input current into high-voltage direct current to be provided to a load, e.g. for use of powering an electrostatic precipitator. The converter includes at least one unit for the conversion of the alternating (AC) input current into high frequency alternating (AC) current, at least one transformer for adapting the high frequency alternating (AC) current to requirements of the load. A series loaded resonant tank is provided between the at least one unit and the at least one transformer. Modularizing of the topology is achieved in that there are at least two units for the conversion of the alternating (AC) input current into high frequency alternating (AC) current connected to the same transformer.