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Instead of boost/buck conversion processor, power supplies single-phase SEPIC conversion processor becomes widely used in computer motherboards and other integrated circuits as well as in photovoltaic solar cell systems. However, multiplier and multiphase interleaved conversion processors become preferred due to their identical advantages over traditional single-phase SEPIC from the possibility of current stress or ripple reduction in active or passive elements perspectives. This paper presents a new class of a double-phase SEPIC conversion processor that has a modified structure in order to maximize the dynamic performance of the previously mentioned topologies of SEPIC. An analytical comparative study was conducted for the multiplier and modified double-phase interleaved SEPIC processor with magnetically uncoupled inductive reactors to show the benefits of this new class of the double-phase connection of SEPIC when compared with the traditional and the multiplier connection. The proposed topologies of multiplier and modified SEPIC are simulated using the Simulink MATLAB, Excel and Simplorer 7. The experimental results and analysis have shown the improved characteristics of the proposed new class of the double-phase SEPIC, low harmonic distortion, sacredness to component tolerance, relief in overall current fluctuation reduction complexity, high power efficiency and a very high voltage gain. [ABSTRACT FROM AUTHOR]

The basic configuration of step up converter usually used in photovoltaic solar systems to increase the DC voltage generated at their outputs suffers from some drawbacks just like high ripple in the output voltage, greater losses in the system and unstable dynamic behavior. To eliminate these drawbacks, this paper introduces a two-phase connection of step up converter with uncoupled smoothing reactors. Detailed analysis, simulation and control strategy have been proposed in this paper to investigate the advantages of using such connection with uncoupled reactors. This paper is intended to prove that two-phase connection with uncoupled reactors helps increasing the output power of the converter, minimizing its output ripple and making its control easier and more efficient. It also increases the converter chopping frequency and consequently decreases the size of smoothing reactors and filters used in the system. Concerning the design of such converters, it requires a long working period of time with a significant cost and specific technical tests at nominal operating points. Therefore, simulation can essentially decrease economic and development costs. Using modulation and simulation software techniques (Simplorer, Simulink, and Matlab) throughout this paper helped simulation of very fast the converter behavior and accurate determination of its dynamic characteristics. Moreover, the paper deals with modulation of voltage control technique using Matlab and Simplorer, thus regulating the converter output current and voltage. Simulation results show that this control technique provides robust output current and voltage of step up converters and is more feasible for their chopper up conversion technique. [ABSTRACT FROM AUTHOR]