Electrical circuit for charging a DC voltage source

An electrical A circuit for charging a DC voltage source from an AC voltage network, the circuit comprising:

• an input able to receive an AC voltage from the AC voltage network,
• a first output able to be connected to the DC voltage source,
• an insulating stage formed using a plurality of capacitors,
• which is arranged so as to electrically insulate the input from the first output of the circuit,
• and
• a frequency-raising stage arranged between the input of the circuit and the insulating stage so that the plurality of capacitors of the insulating stage are in a circuit portion that has flowing through it an AC current at a frequency that is greater than that of the AC voltage network, the frequency-raising stage being different from an association in series of a rectifier and of an inverter,
• the frequency-raising stage comprising;
• a first branch comprising two controllable electronic switches arranged in series, so as to produce a first switching cell that is bidirectional in terms of current and in terms of voltage, and
• a second branch comprising two controllable electronic switches arranged in series, so as to produce a second switching cell that is bidirectional in terms of current and in terms of voltage,
• the first and second branches of the frequency-raising stage having a common terminal forming an output of the frequency-raising stage and an input of the insulating stage.