Patent ID: 7449869

Claim:
A power converter comprising: a power processing circuit including at least one pulse width modulated power switch; a digital current-mode controller for generating a control signal used to control the power switch of the power processing circuit, wherein the digital controller is for modifying the duty ratio of the control signal, and wherein the digital controller includes; a voltage sampling and A/D converter connected to the output of the power processing circuit for sampling the output voltage of the power processing circuit and converting the sampled output voltage to digital values; a voltage feedback loop compensator module connected to the voltage sampling and A/D converter for generating a first signal representative of a duty ratio of the control signal by adjusting a frequency characteristic of a signal representative of a difference between (1) the sampled and A/D converted digital values of the output voltage of the converter and (2) a reference voltage; a current signal sampling and A/D converter connected to an output inductor of the power processing circuit for sampling the current of the output inductor and converting the sample current to digital values; a current feedback loop compensator module in communication with the low frequency current signal sampling and ND converter for generating a second signal representative of a modification to the duty ratio of the control signal based on the sampled and A/D converted digital values of the current of an output inductor of the converter; a subtraction module for generating a third signal representative of the second signal subtracted from the first signal; and a duty ratio PWM generator module for generating the control signal having a duty ratio proportional to the third signal.