Design of an Interleaved High Step-Up DC-DC Converter with Multiple Magnetic Devices for Renewable Energy Systems Applications

An interleaved high step-up converter topology based on the coupled inductor (CI) and built-in transformer (BIT) is proposed in this study to provide voltage gain efficiency with a low number of power electronic components for renewable energy applications. The increased by both turns’ ratio CI BIT, so there no need extend duty obtain gain. much more flexible than those only either or BIT. Moreover, stress across semiconductor devices can be relatively decreased adjusting In addition, input current ripple reduced when structure applied at converter. Furthermore, turned-OFF turned-ON zero switching (ZCS) conditions diodes MOSFETs are achieved, respectively, thanks leakage inductances magnetic devices. Hence, due control falling rate inductances, reverse recovery problem alleviated. recycled clamp capacitors avoiding spikes MOSFETs. As result, according abovementioned advantages converter, ON-state resistance forward drop used decrease conduction losses. A 600 W laboratory prototype 27–400 V conversion frequency 50 kHz built verify performance Experimental results confirm theoretical analysis. reaches 94.6% full load which close calculated 95.8%.