An improved adaptive current control for d.c.-d.c. converters based on current slope detection

Abstract

This paper presents a predictive one-step current control scheme for d.c.-d.c. converters with a generic RLE load. In avoidance of the parameter sensitivity of the controller, a permanent identification of the controlled system will be used, so that there is also no need of knowledge of the control parameters like the inductance, resistance and d.c.-link voltage. Only current measurement is necessary. The identification needs no additional test pulses, instead it uses the current response caused by the alternation of the switching states of the d.c.-d.c. converter with a standard pulse-width modulation (PWM). It will be shown that this control is suitable for four-quadrant operation. Furthermore it needs no superposed control circuit for the regulation of the mean value of the current.