method are disclosed that may incorporate a plurality of cascading power units arranged in parallel a connection interface between the plurality of cascading power units and an electronic load wherein the connection interface prevents current from entering one of the plurality of cascading power units from another of the plurality and wherein each one of the plurality of cascading power units has a maximum effective output voltage greater than a next one of said plurality application_number US 72572003 A description fig1 is a block diagram illustrating power supply module 10 configured according to the teachings herein power supply module 10 incorporates individual bulk power supplies 100 103 arranged in parallel power supply module 10 supplies power to load 11 through power regulator circuit 12 the positive terminals of bulk power supplies 100 103 are connected to diodes 104 107 respectively generally to prevent current from sinking into a failed one of bulk power supplies 100 103 should a failure occur for example if bulk power supply 100 fails diode 104 turns off as the voltage on the anode of diode 104 falls below the voltage of its cathode thus restricting current from bulk power supplies 101 103 from sinking into failed bulk power supply 100 however if diode 104 is off then bulk power supply 100 does not supply any power to load 11 leaving bulk power supplies 101 103 to supply the power to load 11 if the current used by load 11 exceeds the current available from bulk power supplies 101 103 then each of supplies 101 103 will begin to droop i e the maximum output voltage begins to drop power supply module 10 takes advantage of the drooping characteristic by using bulk.