| This Ph.D. Thesis presents a novel Average Current Mode Control (ACC) strategy for the control of PWM DC-DC converters, which represents a drastic improvement over conventional ACC. This new method consists of the addition of an auxiliary controller into the control loop, besides the current and voltage regulators, achieving the proposed 3CRACC (Three-Controller Robust ACC) loop.; The model-based auxiliary controller can increase the closed loop small-signal bandwidth of Buck derived converters, preserving loop gain crossover frequency and stability margins over significant changes of the power stage passive elements values, the load and the line voltage. Moreover, this control scheme shows much better disturbance rejection properties, i.e. closed loop impedance and audiosusceptibility, than conventional ACC. From a Control Theory point of view, robust performance is achieved preserving stability.; Other advanced robust control strategies like H∞ and Robust Parametric Control Theory are also applied to ACC controlled converters in order to reach the objective.; Finally, three robust control techniques like H∞, 3CRACC and their combination are applied to ACC controlled MPCS. The proposed robust ACC control strategies are implemented in a 5V-20A parallel-module converter composed by four Buck power stages operating from an input voltage ranging from 15V to 25V.; Experimental measurements have been carried out showing the improvement achieved by the different robust control schemes. |
