Control of chaos in SEPIC DC-DC converter

Abstract

DC-DC converters are widely used in power electronic systems where there is a need for stabilizing a given dc voltage to a desired value. It has been reported that DC-DC converters exhibit different non-linear phenomena including bifurcations, quasi-periodicity and chaos under both voltage mode and current mode control schemes. In this work, current mode controlled SEPIC converter operating in continuous conduction mode is considered and by varying the reference current I ref , the converter exhibits chaos. It has been observed that the system changes from a stable buck-like operation to an unstable boost-like operation by varying I ref . Bifurcation diagram is plotted for control signal and capacitor voltage with I ref as bifurcation parameter. Resonant parametric perturbation control technique has been applied to suppress chaos. Effects of phase shift and frequency mismatch are also analyzed. With phase shift, control power required for suppressing chaos has been reduced. Also intermittent chaotic stages are suppressed with the effect of frequency mismatch at the expense of increasing control power. The stability analysis in SEPIC converter is performed by means of discrete model and is validated through the simulated and experimental results.

Non‐linear modal analysis of transient interaction behaviours in SEPIC DC–DC converters

“…Hessian matrix, i = 1, 2, …, 5, respectively. The details of the Jacobian matrix are shown below (see (14)) and Hessian matrices for the converter are attached in the Appendix. Here we assume that λ j , j = 1, 2, …, 5 denote the distinct eigenvalues of the Jacobian matrix A, U and V is the right and left eigenvectors of A, respectively.…”

Performance comparison and stability analysis of ACM and ENLC controlled SEPIC PFC converter

“…Almost all DC-DC converters can be used as PFC converters, but boost, buck-boost, ĆUK and single-ended primary inductance converter (SEPIC) converters are best suited for the implementation of PFC because of the presence of an inductor in series with the output of the diode bridge rectifier [10][11][12][13][14][15][16][17][18][19]. ĆUK and SEPIC converters offer additional advantages of single-stage transformer isolation, magnetic coupling and buck/boost operation [16][17][18][19]. Among these, SEPIC converter is a widely used converter in industrial application, as it has an additional advantage of positive polarity output voltage over ĆUK converter.…”

“…Among these, SEPIC converter is a widely used converter in industrial application, as it has an additional advantage of positive polarity output voltage over ĆUK converter. SEPIC also has continuous input current, fewer ripples in source and load currents and reduced conducted noises [17][18][19].…”

Efficient bridgeless SEPIC converter fed PMBLDC motor using artificial neural network

“…The Artificial neural network outputs the appropriate control signal for achieving the desired speed under variations in the motor load [17]. The ANN must learn the connection weight from available training pattern.…”