Control Scheme for Reduced Cross-Regulation in Single-Inductor Multiple-Output DC–DC Converters

Abstract

Single-inductor multiple-output (SIMO) dc-dc switching regulators are potentially very good replacement to multiple parallel converters in today's power management units for portable applications where multiple supplies are required. The outputs in these converters being coupled, cross-regulation among the outputs plays a major role in deciding the performance of the system. This paper proposes a control scheme that ensures good load and line regulation and stable system dynamics and reduces cross-regulation effect significantly. In designing a control scheme, proper analysis of the system is an important factor, and SIMO class of converters being driven by a ripple in the inductor current, conventional modeling does not hold good. Consequently, a ripple-based modeling approach that accurately judges the system performance is adopted. A cross-derivative state feedback control methodology has been proposed so as to completely decouple the outputs. Finally, a single-inductor dual-output SIMO converter has been built on a printed circuit board using discrete components, and the test results presented validate the modeling technique proposed. The simulation and experimental results show that the proposed control scheme significantly reduces cross-regulation at the outputs.Index Terms-Cross-regulation, dc-dc switching converter, ripple-space averaged modeling technique, single-inductor multiple-output (SIMO) converters.

Multi Loop Controllers for Single Inductor Multiple Output Dc-Dc Buck Converters: A Comparative Study

“…However the digital controllers are complex and need extra sensing devices along with A/D and D/A converters. The compensators are designed with the help of the ripple based mathematical model of the system [10] to suppress the cross regulation between the outputs but 5 % ripple is seen in the outputs. Some authors [11] ,instead of using the advanced control and high switching frequency, parallel structured hybrid SIMO power converter is developed with active current compensation technique to minimize the cross regulation.…”

Programmable Topology Derivation and Analysis of Integrated Three-Port DC-DC Converters with Reduced Switches for Low-Cost Applications

“…To construct a multi-port system, employing multiple conventional single-input single-output (SISO) dc-dc converters is a feasible solution, but undesired high cost and large volume are incurred due to the large number of components. Actually, components such as magnetic elements and semiconductor devices in different power electronics converters can be multiplexed to achieve reduced cost, which have been adopted to derive a variety of integrated multi-port converters in [9][10][11][12][13][14][15][16][17][18].…”

Cross Regulation Reduced Optimal Multivariable Controller Design for Single Inductor DC-DC Converters

“…However, the procedure involved is very complex and lengthy. A ripple-based modelling of the SIDO buck converter is developed for cross derivative state feedback control methodology in [9]. The number of compensators required is two times that of the outputs and the parameters of the compensators are obtained using trial and error method.…”