Patent ID: 8063602

Claim:
A stochastic anti-windup digital proportional-integral (PI) control circuit for controlling performance of a variable-speed motor drive, the circuit comprising: a randomization block; a plurality of logic-based AND gates, each having a signal input for receiving a signal output of the randomization block, and another signal input for receiving a saturation signal; and an up/down counter for receiving signal outputs from the plurality of AND gates; wherein the circuit is configured to perform a normal integration process when the saturation process is in a linear region, a second set of AND gates, each having a signal input for receiving a signal output of a corresponding one of the AND gates of the first set of AND, and another signal input from a corresponding one of the plurality of randomization blocks; wherein the circuit is configured to provide a tunable parameter that can be tuned to adjust the anti-windup performance of the circuit.