a method and apparatuses are used for power conversion . the apparatus according to one embodiment comprises a plurality of power conversion modules , the plurality of power conversion modules being optionally controllable to function independently of each other to supply a plurality of systems , function in an inter - relational mode in which at least one power conversion module from the plurality of power conversion modules drives a system and , upon a failure of the at least one power conversion module , at least another power conversion module from the plurality of power conversion modules will drive the system , and function in a scalable mode in which at least two power conversion modules of the plurality of power conversion modules are connected to provide an additive output .