Power Supply System and Apparatus

A switched power supply comprising:

• input terminals for receiving electric power and output terminals for delivering an output signal having an output voltage and an output current;
• wherein the input terminals are separated from the output terminals by an insulation barrier so that the input terminals are provided on a primary side of the insulation barrier and the output terminals are provided on a secondary side of the insulation barrier;
• a converter stage coupled between the input terminals and the output terminals, the converter stage having at least one controllable first switching element for generating a converter state duty cycle so as to cause the converter stage to generate the output signal;
• and
• a digital circuit for controlling the switching element in dependence of at least one signal, wherein the digital circuit is located on the primary side of the insulation barrier, and
• the switched mode power supply further comprises an amplifier located on the secondary side and arranged to receive the output voltage on a first amplifier input and produce an amplifier output signal that is to be transferred across the insulation barrier to the digital circuit,
• the switched mode power supply being characterized in that the digital circuit is a programmable digital circuit comprising
• a processing means,
• a working memory, and
• an at least partly non-volatile memory for storing executable commands,
• and that the amplifier is frequency dependant having a transfer function characteristic that amplifies higher frequency components relative to the lower frequency components.