The invention relates to a master-slave power supply system, which comprises: (a) a master power supply unit having an output power port; (b) one or more slave units, each unit having its own power port; wherein the output power port of the master unit, as well as the output ports of all the slave units are connected in parallel; and wherein a bridging cable connects between the master unit and a first slave unit, and additional bridging cables connect respectively each of the slave units to a next one, until a last slave unit, and wherein at least a voltage feedback signal is conveyed from master unit to all the slave units in parallel over said bridging cables.