State-space control structures for buck converters with/without input filter [articol]

Abstract

Power supplies normally provide a constant output voltage. In most of the applications a DC/DC-converter is controlled by a voltage mode or a current mode controller. Often these controller types are combined with feed forward techniques of the input voltage or output current, because these variables are disturbance variables. In this paper three state-space control structures are introduced. Based on the state-space representation an easy controller is designed first. An improved one works with an inner one-cycle controller. The third controller is designed for a buck converter with a minimized input filter.