DC-DC converter and method and apparatus for controlling a DC-DC converter

A method for controlling a DC-DC converter with a first transducer (102) and a downstream second transducer (104), said first converter (102) is adapted to an input signal (112) of the DC-dependent (by an adjustable first ratio of the first transducer to convert 102) in a DC link signal (114) and said second converter (104) is configured to convert the DC link signal (114) dependent (by a second adjustable transmission ratio of the second transducer 104) into an output signal (116) of the DC-DC converter, includes a step of determining a first control signal (232) for setting the first gear ratio of the first converter (102) using the output signal (116) of the DC-DC converter to the DC link signal (114) dependent on one of the output signal (116) set point (345 to control) for the intermediate circuit signal (114).