This paper presents various issues on the design and implementation of a pulse-width modulation (PWM) based sliding mode (SM) controlled buckboost converter operated in continuous conduction mode (CCM). The method of modeling the system and translation of the SM equations for the PWM implementation are illustrated. The static and dynamic performances of the system are tested with an experimental prototype. Experimental results show that the proposed control scheme provides good voltage regulation and is suitable for common DC-DC conversion purposes.

Design of a PWM based sliding mode controlled buck-boost DC-DC converter in continuous conduction mode

Coupled-inductor boost converters are under development for high-current, high-power applications ranging from automotive fuel cells to photovoltaics. In order to operate over the full load range of a dc-dc converter, the implemented controller must be capable of maintaining stability in both Continuous-Conduction Mode (CCM), and Discontinuous-Conduction Mode (DCM). This paper presents the development of a digital Type II compensator, implemented in the inner loop of an average-current-mode-control scheme. Two different Type II compensators are designed; one for CCM operation, and the other for DCM operation. Finally, a novel method called Forced-Output Control is implemented in order to greatly reduce the transient which would normally occur when switching compensators mid-operation. The Type II compensators and Forced-Output Control scheme are verified experimentally from a 1 kW coupled-inductor boost converter prototype.

Digital Type II compensation with forced-output control of an interleaved two-phase coupled-inductor boost converter

The modelling of sliding mode (SM) based controlled DC-DC buck-boost converter operating in continuous conduction mode (CCM) with pulse-width modulation (PWM) based is represented in this paper. The model is simulated by Matlab/Simulink software package. The system is modelled and the SM equations for the PWM implementation are illustrated. The performances of the system are tested for the static and dynamic performance is investigated. The simulation results show good and accepted values for voltage regulation which makes the model suitable for common DC-DC conversion purposes.

Khaild A. Abbas

Papers

Checking the robustness of a PWM sliding mode controlled DC/DC buck-boost converter using its Matlab/Simulink model