A MODIFIED DESIGN OF SELF-LIFT NEGATIVE OUTPUT LUO DC-DC CONVERTER BASED ON INDUCTIVE AND HYBRID SWITCHING CELLS

Saja Salim  Ali; Hassan Jassim  Motlak

doi:10.30572/2018/KJE/170131

Authors

Saja Salim Ali Department of Electrical Engineering, College of Engineering, University of Babylon, Hillah, Iraq
Hassan Jassim Motlak Department of Electrical Engineering, College of Engineering, University of Babylon, Hillah, Iraq

DOI:

https://doi.org/10.30572/2018/KJE/170131

Keywords:

DC–DC Converter, Self-lift, Negative Luo Converter, PI Controller, Hybrid cell, Inductive cell

Abstract

The DC-DC converters are essential to the operation of renewable energy systems because they implement conversions for changing input voltage levels to fixed output levels of voltage. In this paper, we propose adopting a Self-Lift Negative Output Luo DC-DC Converter (SLNOLC), which implements two more configurations – an inductive switching cell and a hybrid switching cell – to increase the voltage gain and efficiency of the converter while reducing component fatigue and ripple. The first design implements an inductive boosting cell, which improves gain by reconfiguring the energy transfer path, while the second design enhances performance even further with the addition of a hybrid inductor-capacitor cell. The proposed converters deliver output voltages of –48V to –60V at 12V input voltage, with pump efficiencies of up to 97 percent. Through continuous conduction mode (CCM), a dynamic response PI controller delivers output stability and fast adjustment within set response values. Simulations done in MATLAB/Simulink demonstrate the superior performance of the proposed designs, validating their use in low-voltage and high-efficiency environments for renewable energy systems.

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