Patent ID: 8190926
Filing Date: 2012-05-29
Classification: G06F,H02M,H03F

Abstract:
1. A power supply system, comprising: a first power supply configured to operate in a first frequency range and generate a first output; a second power supply configured to operate in a second frequency range and generate a second output, a lower end of the second frequency range being at least higher than a lower end of the first frequency range; a power combiner circuit combining the first output with the second output to generate a third output for driving a load; and a feedback circuit coupled to receive the third output through a feedback loop, the feedback circuit comparing the third output with a predetermined control signal and generating one or more power supply control signals for controlling the first power supply and the second power supply based on a difference between the third output and the predetermined control signal, wherein an output impedance of at least one of the first power supply and the second power supply is set to greater than 10% of a minimum equivalent impedance seen at the load of the power supply system.