Patent ID: 7602155

Claim:
A power supply for providing a modulated output voltage to a load comprising: a plurality of non-synchronized, parallel-connected switch-mode power modules, wherein each module comprises: first and second switching transistors connected across first and second input voltage nodes, wherein a drain terminal of the first transistor is connected to the first input voltage node, a source terminal of the first transistor is connected to a drain terminal of the second transistor at a common node, and a source terminal of the second transistor is connected to the second input voltage node; and an inductor having a first terminal connected to the common node between the first and second transistors, and a second terminal connected to the output of the power supply; and a controller connected to each of the power modules for controlling the time duration of a forward state for each power module, wherein the forward state is when the first transistor is conductive and the second transistor is nonconductive, wherein the controller is for controlling the output voltage of the power converter by controlling the ratio of power modules in the forward state at a time to the total number of power modules, wherein the controller controls the power supply modules without output voltage feedback.