Power supply unit DC-DC conversion

摘要

The invention relates to a power supply unit for direct current to direct current DC-DC conversion having multiple outputs. Such power converters comprise a DC-AC converter 100, a transformer 200 and a plurality of AC-DC converters 300-i i=1 . . . n each for generating an individual DC-output voltage Vi being provided to a respective load impedance 330-i. Lossy components in said transformer and said AC-DC converters cause undesired voltage drops causing undesired fluctuations of the DC-output voltages. A reduction of said fluctuations of said DC-output voltages is achieved by feeding-back the DC-output voltage of at least one AC-DC converter to said DC-AC converter. Starting from that prior art it is the object of the invention to improve a power supply unit for DC-DC conversion such that a more uniform sharing of the fluctuations of the output voltages is achieved easily and cheaply. This object is achieved according to the present invention by connecting an auxiliary impedance 340 in series to the load impedance connected to one of said AC-DC converters.