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Keywords
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: Buck, dc-dc converter, non-isolated, dual switches, voltage stress
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Abstract
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: This paper proposes an innovative structure for DC-DC converters with high buck gain by using a lower
5 number of elements. The converter provides highly efficient output power and an extended output voltage range. In
6 addition, the distribution of output current between two inductors and the soft-switching capability of the power switches
7 have made the converter suitable for applications that require high output current. All power switches accomplish the
8 ZVZCS (zero-voltage and zero-current switching) condition with the aid of a small auxiliary inductor (Lx), which
9 charges and discharges parallel capacitors of main switches to provide soft-switching conditions. Thus, the switching
10 losses associated with power switches are considerably reduced. Additionally, the output voltage ratio of the proposed
11 converter can be changed by varying the switching frequency and duty cycle. In addition, the variation range of output
12 voltage has been expanded compared to other topologies, allowing for a wider output voltage range. A coupled inductor
13 is utilized to establish a relationship between the output gain and the turn ratios, resulting in a wider output voltage
14 gain range. Eventually, a theoretical analysis is conducted and a 200-watt experimental prototype has been implemented
15 to illustrate the proposed converter’s efficacy. It converts a voltage input (300 V) to a voltage output (10 V).
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