Patent ID: 7332898

Claim:
A multi-phase power system, comprising: a plurality of Pulse Width Modulation (PWM) controllers including a first PWM controller and at least one second PWM controller; wherein the first PWM controller is configured to generate at least one first PWM output signal based on a cyclic signal having a cyclically recurring parameter, and to provide the cyclic signal including the cyclically recurring parameter to the second PWM controller; wherein the second PWM controller is configured to generate at least one second PWM output signal based on the cyclic signal, and to synchronize the generation of the first and second output signals using the cyclically recurring parameter of the cyclic signal, thereby maintaining a predetermined phase relationship between the first and second output signals; wherein the second PWM controller is configured to generate a cyclic, triangular RAMP waveform signal having a series of periods, the RAMP waveform having in each period a signal rising portion and a signal falling portion, and wherein the RAMP waveform is compared against an error signal to generate the second PWM output signal, the RAMP waveform rising portion and falling portion being generated by charging and discharging, respectively, a capacitor; and a feedforward path comprising means for setting a charging current for the capacitor that is proportional to an input voltage.