Method for operating a DC-DC voltage converter apparatus and control device for operating a DC-DC voltage converter apparatus

A method for operating a DC-DC voltage converter apparatus having at least two DC-DC voltage converter units connected electrically in parallel with one another in an electrical network, the method comprising:

• operating the at least the DC-DC voltage converter units according to a respectively predetermined control principle, wherein the control principle is based on current mode control and, in order to set an output voltage of a respective DC-DC voltage converter unit, a respective reference current is prescribed depending on a comparison of a prescribed reference voltage with the respective output voltage, and a respective setting value is prescribed depending on a comparison of the prescribed respective reference current with a respective filter current, which in the respective DC-DC voltage converter unit is tapped on an output side at an electrical circuit for filtering the output voltage, wherein the respective setting value stipulates a duty cycle of a circuit arrangement of the respective DC-DC voltage converter unit, the circuit arrangement being used for DC-DC voltage conversion, and wherein the DC-DC voltage converter units are operated in a master/slave configuration,
• operating one of the DC-DC voltage converter units as a master converter according to the control principle based on the current mode control, and
• operating at least one further DC-DC voltage converter unit as a slave converter, according to the control principle based on the current mode control, which is supplemented with a preconditioning function, and as a result in accordance with a predetermined calculation specification a reference voltage for operating the respective slave converter and an operating mode of the respective slave converter is prescribed depending on the output voltage of the respective slave converter and a master reference voltage prescribed by the master converter.