Patent ID: 7245512

Claim:
A digital PID controller for controlling the operation of a switching power converter, comprising: a data converter for converting an analog sense voltage to a digital sense voltage; a difference circuit for determining the difference between the digital sense voltage and a reference voltage as a digital error voltage, which reference voltage represents a desired output DC voltage for the power converter; a digital compensator for processing the digital error voltage, said digital compensator comprising: a proportional, integral, differential (PID) compensation network for compensating the digital error signal with a discrete time PID control law, and a postprocessing filter section for processing the output of said PID compensation network, comprised of a sinc filter with variable parameters to define the operating characteristics thereof, such that a first notch associated therewith can be placed at a desired frequency; a switching control signal generator for generating switching control signals for controlling the operation of the power converter, wherein said digital compensator and said switching control signal generator operate to minimize said digital error signal; and a controller for controlling the operation of said digital compensator to define said operating characteristics of said sinc filter.