Novel Digital Control Architecture with Non-Linear Control Algorithms Exhibiting Very Fast Transient Response

A dual-voltage-loop digital control architecture with non-linear control algorithm is proposed in this paper. An adaptive voltage positioning (AVP) control unit was generalized to achieve adaptive voltage positioning, by generating dynamic voltage reference and dynamic current reference. A dynamic reference step adjustment method lowers the high speed requirement of reference updating clock; a non-linear control minimizes the transient-assertion-to-action delay and maximizes the inductor current slew rate; and a transient detection circuit recognizes the load transient state in a manner adaptive to the amount and slew rate of load current transient. Theoretical, simulation and experimental results prove the effective operation and excellent dynamic performance of the digital controller.