Converter circuit and unit and system comprising such converter circuit

A converter circuit comprising:

• a first resonant converter that is connected on a DC voltage side to a first energy storage circuit;
• a transformer;
• a second resonant converter that is connected on an AC voltage side to a secondary winding of the transformer and on the DC voltage side to a load converter;
• and
• a CLL resonant circuit that is connected to the first resonant converter and to a primary winding of the transformer and has a resonant capacitance, a first resonant inductance, and a second resonant inductance,
• wherein the resonant capacitance is connected in series with the first resonant inductance, which is connected to a first connection point of the primary winding of the transformer and the resonant capacitance is connected to the first resonant converter, and the second resonant inductance is connected to the connection point of the resonant capacitance to the first resonant inductance, the second resonant inductance is connected to a second connection point of the primary winding of the transformer, and the second connection point of the primary winding of the transformer is connected to the first resonant converter.