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Keywords
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Continuous input current,
High step-up,
Non-isolated DC-DC converter,
Photovoltaic application,
SEPIC-based structure
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Abstract
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This paper aims to present, study, and analyze a novel non-isolated high step-up SEPIC-based DC-DC converter for photovoltaic applications. The proposed structure is drafted from the SEPIC converter. A two-winding coupled inductor and an improved voltage multiplier cell are utilized to achieve a high voltage conversion ratio. Moreover, a passive voltage clamp is employed to recycle the stored energy in the leakage inductance of the coupled inductor and reduce the voltage stress on the switch. Hence, a switch with low on-resistance could be used. Since all diodes turn off under ZCS conditions, their reverse recovery problems are alleviated. High efficiency, continuous input current, and low cost and size are the other merits of the presented structure, making it a promising solution for photovoltaic systems. At the end, the proposed converter is compared with several DC-DC structures to prove its advantages over the converters presented before. To verify the performance of the designed topology, a 200-W laboratory prototype is implemented and experimental results are depicted. The Results validate the practicability and functionality of the proposed structure for photovoltaic applications.
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