Patent ID: 7454238

Claim:
A power supply system, comprising: a low-speed power supply configured to operate in a first frequency range and generate a first output; a high-speed 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 frequency blocking power combiner circuit combining a first power of the first output with a second power of the second output to generate a combined, third output for driving a load, while providing frequency-selective isolation between the first output and the second output; and a feedback circuit coupled to receive the combined, third output through a feedback loop, the feedback circuit comparing the third output with a predetermined control signal and generating a first power supply control signal for controlling the low-speed power supply and a second power supply control signal for controlling the high-speed power supply based on a difference between the third output and the predetermined control signal.