Hybrid control of a boost converter operating in discontinuous current mode

Abstract

compared in simulation as well as in experiments [8][9]. One Abstract-The control of DC-DC converters, in particular example for controller design based on the hybrid model is the boost converter, has been the focus of research for nearly 3 the sliding mode control scheme [6,7]. Like many other decades. Several attempts have been made to design a suitable methods, this scheme, in general, is employed only for controller for the boost converter. But these designs either meters opeme,In gecausl, Is coyedton for suffer from model inaccuracy or their inability to apply to both converters operating in CCM, because, the construction of a continuous and discontinuous current modes (CCM and DCM). linear or non linear sliding surface for the control design in In this paper, a hybrid control scheme, based on hybrid DCM is difficult. There are applications where it is automaton, is proposed for the output voltage regulation of a advantageous to operate the converter in CCM under full boost converter. Though the emphasis in this paper is on DCM, load conditions and in DCM under light load conditions to the scheme is applicable to both CCM and DCM operation. A safe area around the operating point is determined in the state improve the overall effircency. In such a converter, the space to ensure the stability of inter-mode switching. The safe operation may move from CCM to DCM or vice versa during area and the steady state set point are dynamic in the sense that the load and line disturbances. In this paper, our aim is to get they vary under various line and load disturbance conditions. a generalized hybrid automaton model representing a boost Then, a suitably designed control algorithm prevents the system converter and to expand the range of operation of a CCM

A Hybrid Control Algorithm for Voltage Regulation in DC–DC Boost Converter

“…The boost converter under closed-loop control can be considered as an interacting combination of two hybrid automatons [20], [21], as shown in Fig. 2.…”

“…As an attempt to rectify the problem of model inaccuracy and control limitations previously discussed, the hybrid modeling technique was presented [20], [21] in the literature as a natural representation of power electronic converters. The hybrid model is a large signal model where the exact behavior of the circuit is used for controller design.…”

On the hybrid automaton models and control synthesis of a single inductor, double output boost converter

“…B Similarly, the other guard conditions, GB 13 B, GB 31 B, GB 24 B, GB 41 B, GB 34, BG B 32 B, and GB 23 Bc an also be defined. Using the hybrid automaton definitions [4,[6][7][8], a more generalized model representing a SIDO boost converter, incorporating the DCM operation is shown in Figs. 2 and 3.…”

“…Also the analysis is restricted to Continuous Current Mode (CCM) operation [5] and the robustness and stability of the converter under various disturbances are not studied. A more general model including the Continuous Current Mode (CCM) and Discontinuous Current Mode (DCM) operation of the converter and the control design for a boost converter is given in [6].…”

FPGA implementation of QFT based controller for a buck type DC-DC power converter and comparison with fractional and integral order PID controllers

“…The averaged (continuous time domain) model is linearized by applying small perturbations to the state variables. Although this approach results in an approximate dynamical model of the system, it is still preferred over other approaches, such as the hybrid modeling and control [2] whose implementation is very difficult.…”