Implementation of a Sliding Mode Controller for Single Ended Primary Inductor Converter

Abstract

This paper presents the regulation of the output voltage and inductor currents in a Single Ended Primary Inductor Converter (SEPIC), operating in the continuous conduction mode (CCM) using a sliding mode controller. Owing to the time varying nature of the SEPIC converter, designing a feedback controller is a challenging task. In order to improve the dynamic performance of the SEPIC, a Sliding Mode Controller (SMC) is developed. The developed SMC is designed by using a state space average model. The performance of the developed controller with the SEPIC converter is validated at different working conditions through Matlab simulations. It is also compared with the performance while using a PI controller. The results show that the designed controller gives very good output voltage regulation under different operating conditions such as a varying input voltage, changes in the load and component variations. A 48V, 46W experimental setup for has been developed in an analog platform to validate the performance of the proposed SMC.

Implementation of Non-Linear Controller for Contemporary DC-DC Converter

“…The FNSLLC constraints and phase-variable transformation are applied in (5). Later, A, B, C, and D matrices becomes…”

“…A FLC for the FNSLLC has been combined with PDIC to reduce the prattling phenomena. In the past most of the researches focus on sliding mode control (SMC) of the converter, in that control method the variables are chosen based on order of the FNSLLC that variables like current and voltage are preferred as closed loop purpose so there is an query on that the higher order converters are difficult to control by using low order controllers [5][6][7][8][9]. A novel control method consist of PDIC plus linear quadratic regulator (LQR) is used for output voltage and inductor current regulation of FNSLLC that are designed as inner and outer loop controllers, the inner loop regulate the inductor current and outer loop controller regulate output voltage in the circuit.…”

Design, analysis, and implementation of an integral terminal reduced‐order sliding mode controller for a self‐lift positive output Luo converter via Filippov's technique considering the effects of parametric resistances

“…The PI coefficients are chosen by considering Equation 36 and observing the output voltage response as: k p =0.01 and k i =20. Also, a comparison between the proposed controller and a simple SMC is provided. The control law of this method is selected as follows: where a 1 = 1, a 2 = 0.01, .…”

“…In the literatures, a double‐loop SMC with a simple structure is applied to DC/DC converters. However, if the state trajectories tend to the sliding manifold, then it will not guarantee that the current and voltage errors approach to zero.…”

“…Moreover, the proposed controller is successful in suppressing the steady‐state error of the output voltage of the converter. In order to show the merits and effectiveness of the proposed controller, a simple SMC is also used for comparison. The major advantages of the suggested controller over other conventional techniques are robustness against large variations of load and voltage, elimination of steady‐state error, excellent output behavior even though parameter variations without modifying the controller coefficients and effortless implementation.…”