Patent ID: 7577002
Filing Date: 2009-08-18
Classification: G05F

Abstract:
1. A control circuit, having frequency hopping capability for controlling a power supply, said control circuit comprising: a switching circuit, coupled to a feedback circuit for generating a switching signal to regulate an output of said power supply, wherein said feedback circuit receives said output of the power supply to generate a feedback signal for controlling said switching signal; a first oscillator, connected to said switching circuit for generating a clock signal to determine a switching frequency of said switching signal; a second oscillator, for generating an oscillating signal, wherein said second oscillator includes a voltage-to-current converter to generate a first signal, a second signal, and a third signal in response to said oscillating signal, and to transmit said first signal and said second signal to said first oscillator for modulating a frequency of said clock signal; and an attenuator, coupled to said feedback circuit for attenuating said feedback signal, wherein said third signal is coupled to said attenuator to control an attenuation rate of said feedback signal.