NONLINEAR P-I CONTROLLER-DESIGN FOR SWITCHMODE DC-TO-DC POWER CONVERTERS

In this article, extended linearization techniques are proposed for the design of nonlinear proportional-integral (P-I) controllers stabilizing, to a constant value, the average output voltage of pulse-width modulation (PWM) switch-regulated dc-to-dc converters. The Ziegler-Nichols method is employed for the P-I controller specification, as applied to a family of parametrized transfer function models of the linearized average converter behavior around a constant operating equilibrium point of the average PWM controlled circuit. The boost and the buck-boost converters are specifically treated and the regulated performance is illustrated through computer simulation experiments.