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This paper proposes a novel high step-up non-isolated dc-dc converter based on the classical synchronous Buck converter with coupled inductor and voltage multiplier techniques. Besides the low switches voltage stress feature, the proposed converter presents a lower magnetic utilization than the Boost-based ones, leading to a more compact structure. Its resonant operation mode enables zero-voltage-switching (ZVS) turn-on of active switches and zero-current-switching (ZCS) turn-off of diodes, which increases its efficiency. Experimental results extracted from a 150 W prototype, able to work with a large variety of commercial PV thinfilm modules, with 55-85 V input and 400 V output voltages, show that the maximum obtained efficiency is nearly 98.0% and the weighted California Energy Commission (CEC) efficiencies are greater than 96.7% over the whole input voltage range.

Conversor CC-CC de Alto Ganho Voltado para Aplicações Fotovoltaicas com Módulos de Filme Fino