A Power supply system and apparatus

摘要

The present invention relates to a switched mode power supply (100) with programmable digital control (600) and to a power supply system comprising a plurality of switched mode power supplies. The input terminals (110) and the output terminals (135) of the switched mode power supply system are separated by an insulation barrier (140), and the switched mode power supply comprises a conversion stage (125) having at least one switching element (205). The switching element of the conversion stage is digitally controlled by a programmable digital circuit (600) which is located on the primary side of the insulation barrier. The programmable digital circuit is adapted to derive the output current ( I out ) from a signal representing the input current of the converter stage ( I int ) by means of executable commands stored in a memory (615), and to use said derived value of the output current in the control of the switching element.