A HIGH STEP-UP COUPLED INDUCTOR DC-DC CONVERTER FOR GRID CONNECTED SOLAR PHOTOVOLTAIC SYSTEMS – JOURNAL OF MECHANICS OF CONTINUA AND MATHEMATICAL SCIENCES

Abstract

This paper presents a coupled inductor-based high-gain DC-DC converter. The proposed topology achieves high step-up conversion and reduced voltage stress of the switch and output diode. The leakage energy is recycled effectively to improve converter efficiency. Moreover, huge turn-off voltage spikes of the switch caused by the leakage inductor are completely eliminated. Besides, all the diodes, except the output diode, turn off softly, eliminating the reverse recovery problem. The operating principle of the converter in continuous conduction mode (CCM) is presented. The voltage gain characteristics, CCM-DCM boundary operation, and parameter design guidelines have been elaborated. A comparison analysis with similar converters has also been presented. Finally, the theoretical analysis has been verified through a simulation study in orcad pspice software. The simulation results are found to be in close agreement with the theoretical calculations.

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