Patent ID: 6850045
Filing Date: 2005-02-01
Classification: H02M

Abstract:
1. A pulse width modulator for driving a load in a multi-phased power system, each phase having a power switch for selectively coupling a corresponding inductor to a source and said load, said multi-phased power system further including a sensor for sensing a channel current in each said phase and providing a plurality of signals each representative of a corresponding channel current, said pulse width modulator comprising: first circuitry coupled with said sensor for receiving said channel signals and responsive thereto for providing an average signal by summing said channel signals at a node coupled with a plurality of resistive elements corresponding to the numbcr of phascs of said multi-phased power system, wherein said average signal is detectable in one of said resistive elements, each said resistive elements having substantially the same resistivity; second circuitry coupled with said load and a reference potential and responsive thereto for providing a signal representative of an error between said load and said reference potential; and third circuitry coupled with said sensor, said first circuitry, and said second circuitry for receiving said channel signals, said average signal, and said error signal, and responsive thereto for providing a respective drive signal for each of said power switches, wherein said error signal and said average signal have complementary effects on a duty factor of said drive signals and said channel signal has an effect contrary to said error signal and said average signal.