Patent ID: 7580498

Claim:
A method for dynamically changing the loop bandwidth of a closed loop control system, wherein at least one loop bandwidth parameter controls the loop bandwidth of the closed loop control system, a plurality of states corresponding to different amount of loop bandwidth is arranged in advance, and the closed loop control system comprises an error detector and a convergence status check unit, the method comprising: via the error detector, detecting periodically an error signal reflecting the convergence status of the output signal of the closed loop control system; via the convergence status check unit, dynamically adjusting the at least one loop bandwidth parameter according to the error signal to change the loop bandwidth of the closed loop control system; and via the convergence status check unit, sequentially applying the plurality of states to the closed loop control system to progressively decrease the loop bandwidth of the closed loop control system with the order of the plurality of states, thus progressively increasing the signal stabilities of the closed loop control system with the order of the plurality of states.