An autonomous free-running Ćuk converter is studied in this paper. Analysis of the describing nonlinear state equations shows that the system loses stability via a supercritical Hopf bifurcation. The boundary of stability is derived and local trajectories of motion studied. Cycle-by-cycle simulations of the actual system reveal the typical bifurcation from a stable equilibrium state to chaos, v...

The current-mode controlled Ćuk converter, being a fourth-order nonlinear nonsmooth system, does not lend itself to any simple analysis and the complexity lies mainly in the modeling of the circuit to capture all the essential nonlinearities that occur in fast time scale. This paper, for the first time, extends the Takagi-Sugeno fuzzy modeling approach to capture fast time-scale nonlinearities ...

This paper presents a linear controller for a multifrequency model of a pulse-widthmodulated Ćuk converter. The controller is based on an equivalent discrete-time version of the linearized multifrequency model and uses the continuous-time output over one switching period. Using this combination we determine the duty ratio at the beginning of every switching period. We discuss how this controlle...

In this paper, a novel approach for two-loop control of the DC-DC Ćuk converter in discontinuous conduction mode is presented using a sliding mode controller. The proposed controller can regulate the output of the converter in a wide range of input voltage and load resistance. Controller parameters are selected using PSO algorithms. In order to verify the accuracy and efficiency of the develope...

This paper presents the comparative analysis between constant duty cycle and Perturb & Observe (P&O) algorithm for extracting the power from Photovoltaic Array (PVA). Because of nonlinear characteristics of PV cell, the maximum power can be extract under particular voltage condition. Therefore, Maximum Power Point Tracking (MPPT) algorithms are used in PVA to maximize the output power. In this ...

This paper presents an analysis of LCR second-order low-pass filter capacitor to achieve a specified ripple output voltage in Buck, forward, Zeta, and Ćuk PWM DC-DC power converters for continuous-conduction mode (CCM). Current waveforms across components are derived. Using the waveform ac component voltage, expression is developed terms capacitance equivalent series resistance. The results can...

This contribution deals with different concepts of nonlinear control for mechatronic systems. Since most physical systems are nonlinear in nature, it is quite obvious that an improvement in the performance of the closed loop can often be achieved only by means of control techniques that take the essential nonlinearities into consideration. Nevertheless, it can be observed that industry often he...