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.

Easy current slope detection for low cost implementation of the direct adaptive current control for DC-DC-converters

“…8kHz) together with fast AD-Converters and realization of the control algorithm in an FPGA. Namely in [4], [11] the DACC was implemented in a similar way and the calculation time was only a few microseconds. If it is possible to implement it like that the control deadtime can be minimized significantly and the adaptivity is maximized.…”

“…In [3], [4] the Direct Adaptive Current Control (DACC) scheme has first been presented for the control of a DC/DCconverter and for single phase applications such as the armature current of a DC machine [5]. Later it was adapted for the current control of magnetic isotropic 3-phase synchronous machines (with L d = L q ) [6], magnetic anisotropic synchronous machines (L d = L q ) [7] and even for 3-phase induction motors [8].…”

Direct flux linkage control scheme for highly utilized DC/DC converters with simple interleaving method

“…Even current control schemes like [16], [17], which are able to adapt for a varying inductance, are not necessarily applicable for high current ripples. These schemes make the assumption ∆i k = ∆i k+1 , which is violated, if the current trajectory is no straight line segment.…”